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International Space Flight (ESA, Russia, China and others) => Russian Launchers - Soyuz, Progress and Unmanned => Topic started by: Stan Black on 09/10/2013 08:11 PM

Title: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Stan Black on 09/10/2013 08:11 PM
Payload: Gonets-M blok № 14
Rocket: Rokot 14А05


State Centre for Space Research and Production, in the name of M.V. Khrunichev
Государственный космический научно-производственный центр имени М.В. Хруничева

Rokot

Quote
Изготовление и поставка ракеты космического назначения «Рокот» для запуска КА «Гонец-М» № 21, 22, 23 (14А05-0000-0)
470 994 000 Russian ruble
Order placed: 14th March 2013
Contractual period: up to 25th December 2014
[source (http://www.zakupki.gov.ru/pgz/public/action/orders/info/common_info/show?notificationId=5439296)] [source (http://www.zakupki.gov.ru/pgz/public/action/contracts/info/common_info/show?contractInfoId=14209479)]

Delivery to launch site

Quote
Подготовка к транспортировке, транспортировка, сопровождение РКН «Рокот» для запуска КА «Гонец-М» № 21-23 в эксплуатирующую организацию и возврат спецтранспорта на предприятие.
8 992 000 Russian ruble
Order placed: 13th December 2013
Contractual period: up to 25th December 2014
[source (http://www.zakupki.gov.ru/pgz/public/action/orders/info/common_info/show?notificationId=7531049)] [source (http://www.zakupki.gov.ru/pgz/public/action/orders/info/common_info/show?notificationId=7631828)] [source (http://www.zakupki.gov.ru/pgz/public/action/contracts/info/common_info/show?contractInfoId=14123280)]


Joint Stock Company «Information Satellite Systems» in the name of Academician M.F. Reshetnev
Открытое акционерное общество «Информационные спутниковые системы» имени академика М.Ф. Решетнёва

Blok № 14 with Gonets-M № 21, 22 and 23, and attachment mechanism 14С137

Quote
Изготовление блока КА «Гонец-М» (изделия 372АС71) № 14 в составе КА «Гонец-М» № 21, 22, 23 и устройства отделения (изделия 14С137.0100-0)
(372АС11.0000-0ТУ, 372АС71.0000-0ТУ)
639 112 000 Russian ruble
Order placed: 3rd July 2012
Delivery: 4th quarter 2014
[source (http://www.zakupki.gov.ru/pgz/public/action/orders/info/common_info/show?notificationId=3497079)] [source (http://www.zakupki.gov.ru/pgz/public/action/contracts/info/common_info/show?contractInfoId=14359652)]

Gonets-M: 3× 210 841 800 Russian ruble
14С137: 1× 6 586 600 Russian ruble

Delivery to launch site

Quote
Транспортировка блока КА «Гонец-М» (изделия 372АС71) № 14 в составе КА «Гонец-М» № 21, 22, 23 и устройства отделения (изделия 14С137.0100-0)
(372АС11.0000-0ТУ, 372АС71.0000-0ТУ)
7 390 200 Russian ruble
Order placed: 3rd July 2012
Delivery: 4th quarter 2014
[source (http://www.zakupki.gov.ru/pgz/public/action/orders/info/common_info/show?notificationId=3497079)] [source (http://www.zakupki.gov.ru/pgz/public/action/contracts/info/common_info/show?contractInfoId=14359652)]

Gonets-M: 3× 2 463 400 Russian ruble



« Last Edit: 31 March 2015 08:07:21 PM by Satori »
Title: Re: Gonets-M blok № 14
Post by: Stan Black on 11/13/2013 04:30 PM
Delivery of Rokot to launch site

Quote
Транспортировка ракеты космического назначения «Рокот» для запуска КА «Гонец-М» № 21-23
http://www.zakupki.gov.ru/pgz/public/action/orders/info/common_info/show?notificationId=7531049

1st post updated.

Title: Re: Gonets-M blok № 14
Post by: Stan Black on 12/15/2013 06:05 PM
Tender from the Centre for Operation of Land-Based Space Infrastructure (TsENKI) for insurance to cover various launches, including «Meteor-M», «Luch-5V», «Elektro-L», «Resurs-P», «MKA-FKI», «Gonets-M»:-
http://www.zakupki.gov.ru/223/purchase/public/purchase/info/common-info.html?noticeId=699599

Direct links to the documents, dated 28th November 2013:-
http://www.zakupki.gov.ru/223/purchase/public/download/download.html?id=3582627
http://www.zakupki.gov.ru/223/purchase/public/download/download.html?id=3580483

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Запуск космического аппарата: КА «Гонец-М»
Объект страхования: РН «Рокот», РБ «Бриз-КМ», КА «Гонец-М» № 21, 22, 23
Страховая сумма (лимит ответственности) млн.руб.: 1 110,000
Дата запуска: IV квартал 2014 г.

Quote
Launch of satellite: satellite Gonets-M
Insured items: rocket Rokot, upper stage Briz-KM, satellites Gonets-M № 21, 22, 23
The sum insured (limit of liability), million ruble: 1 110,000
Launch date: 4th quarter of 2014
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: Stan Black on 01/19/2015 03:49 PM
Latest "official" news report about Russian launches, this time for February - March 2015: http://www.militarynews.ru/story.asp?rid=1&nid=363303 (http://www.militarynews.ru/story.asp?rid=1&nid=363303)

The new dates are:

March 3 - 3x Gonets-M [block 14]
March 17 -  Ekspress-AM7
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: Galactic Penguin SST on 01/26/2015 07:52 AM
All 3 satellites have been delivered to Plesetsk a few days ago: http://www.iss-reshetnev.ru/?cid=news&nid=1833 (http://www.iss-reshetnev.ru/?cid=news&nid=1833)
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: russianhalo117 on 01/28/2015 07:54 PM
based on some talks there most likely will not be a fourth Kosmos on this flight but probably next since there is an unflown payload at the MIK
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: Stan Black on 02/19/2015 06:21 PM
Briz-KM originally manufactured to launch Kanopus-V-IK, since moved to Soyuz-2-1A.
Is № 72526 for a Kanopus satelite?
No, Gonets.

Quote
15A05 Rokot/Briz-KM (4929794554/72526)
http://www.zenite.nu/orbita
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: Nicolas PILLET on 02/19/2015 08:44 PM
http://www.zenite.nu/orbita/spacex-lanca-satelite-dscovr-para-a-noaa/

Wow ! We can find a link about SpaceX even in a thread dedicated to a UR-100NU Soviet nuclear missile launch ! :D
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: Stan Black on 02/19/2015 08:48 PM
http://www.zenite.nu/orbita/spacex-lanca-satelite-dscovr-para-a-noaa/

Wow ! We can find a link about SpaceX even in a thread dedicated to a UR-100NU Soviet nuclear missile launch ! :D

They do appear to be spreading across all things… try to keep your voice down, or you’ll find this thread hijacked by their groupies.
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: Stan Black on 02/20/2015 07:39 AM
So the fifth digit of the serial number indicates that the batch production date of this rocket was 1989?
http://forum.nasaspaceflight.com/index.php?topic=36777.0
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: russianhalo117 on 02/20/2015 05:58 PM
So the fifth digit of the serial number indicates that the batch production date of this rocket was 1989?
http://forum.nasaspaceflight.com/index.php?topic=36777.0
yes
Title: Re: Rokot – Gonets-M blok № 14 – 3rd March 2015
Post by: zubenelgenubi on 02/23/2015 04:14 PM
based on some talks there most likely will not be a fourth Kosmos on this flight but probably next since there is an unflown payload at the MIK

Is the unflown payload DOSAAF-85?  Given the previous Gonets-M triplet launch last year, it appears that it was scheduled to launch with that set, but then not.  Link to topic below:
http://forum.nasaspaceflight.com/index.php?topic=32815.0 (http://forum.nasaspaceflight.com/index.php?topic=32815.0)

Link to satellite's page on Gunter's Space Page:
http://space.skyrocket.de/doc_sdat/dosaaf-85.htm (http://space.skyrocket.de/doc_sdat/dosaaf-85.htm)

If DOSAAF-85 doesn't launch on this flight, then when?

Curious,
Zubenelgenubi
Title: Re: Rokot – Gonets-M blok № 14 – March 3, 2015 (16:40 UTC)
Post by: Galactic Penguin SST on 02/24/2015 10:09 AM
The launch is scheduled at 16:40 UTC: http://tass.ru/kosmos/1787236 (http://tass.ru/kosmos/1787236)
Title: Re: Rokot – Gonets-M blok № 14 – March 3, 2015 (16:40 UTC)
Post by: russianhalo117 on 02/25/2015 04:50 PM
based on some talks there most likely will not be a fourth Kosmos on this flight but probably next since there is an unflown payload at the MIK

Is the unflown payload DOSAAF-85?  Given the previous Gonets-M triplet launch last year, it appears that it was scheduled to launch with that set, but then not.  Link to topic below:
http://forum.nasaspaceflight.com/index.php?topic=32815.0 (http://forum.nasaspaceflight.com/index.php?topic=32815.0)

Link to satellite's page on Gunter's Space Page:
http://space.skyrocket.de/doc_sdat/dosaaf-85.htm (http://space.skyrocket.de/doc_sdat/dosaaf-85.htm)

If DOSAAF-85 doesn't launch on this flight, then when?

Curious,
Zubenelgenubi
Its launch can occur on any flight that aligns with its predecessor SC's, its just a matter of being made ready for a launch instead of overrunning on processing. there is 50% chance it will be launched otherwise ballast will be in its place on the launcher.
Title: Re: Rokot – Gonets-M blok № 14 – March 3, 2015 (16:40 UTC)
Post by: Galactic Penguin SST on 03/02/2015 09:48 AM
Looks like this launch is almost certain to slip past tomorrow due to "unspecified technical reasons": http://www.militarynews.ru/story.asp?rid=1&nid=368274 (http://www.militarynews.ru/story.asp?rid=1&nid=368274)
Title: Re: Rokot – Gonets-M blok № 14 – March 3, 2015 (16:40 UTC)
Post by: Lanista on 03/02/2015 01:07 PM
Due to collision
(according NK forum)
Title: Re: Rokot – Gonets-M blok № 14 – March 3, 2015 (16:40 UTC)
Post by: Galactic Penguin SST on 03/02/2015 10:57 PM
Due to collision
(according NK forum)

That poor rocket will be grounded for >10 days ("no launch in at least a week an a half"): http://ria.ru/space/20150302/1050528118.html (http://ria.ru/space/20150302/1050528118.html)
Title: Re: Rokot – Gonets-M blok № 14 – Mid-March, 2015
Post by: Liss on 03/03/2015 04:29 PM
Due to collision
(according NK forum)
That's not correct.
Title: Re: Rokot – Gonets-M blok № 14 – Mid-March, 2015
Post by: Galactic Penguin SST on 03/04/2015 09:14 AM
Due to collision
(according NK forum)
That's not correct.

According to http://tass.ru/kosmos/1806760 (http://tass.ru/kosmos/1806760) it's a first stage engine problem that needs inspection. The rocket was rolled back to the HIF.

I wonder if this is related to what seems to be a UR-100N failure during a hypersonic reentry test launched from Dombarovskiy on February 26 (http://thedragonstales.blogspot.com/2015/03/russian-project-4202-boost-glide.html)?
Title: Re: Rokot – Gonets-M blok № 14 – April 2015
Post by: Galactic Penguin SST on 03/16/2015 02:39 PM
Slipping into April: http://tass.ru/kosmos/1831026 (http://tass.ru/kosmos/1831026)
Title: Re: Rokot – Gonets-M blok № 14 – April 2015
Post by: Galactic Penguin SST on 03/21/2015 03:03 PM
According to anik, the launch has been re-scheduled on March 31 at 13:48 UTC. (http://novosti-kosmonavtiki.ru/forum/messages/forum12/topic14389/message1353268/#message1353268)
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Nicolas PILLET on 03/30/2015 09:36 PM
Just a little bump : tomorrow is a launch day !
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:47 UTC)
Post by: Chris Bergin on 03/31/2015 12:10 PM
Briz-KM Upper Stage I would assume?
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:47 UTC)
Post by: Galactic Penguin SST on 03/31/2015 12:25 PM
Briz-KM Upper Stage I would assume?

All Rokot flies with it, or it isn't a Rokot.  ;)
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:47 UTC)
Post by: Chris Bergin on 03/31/2015 12:35 PM
Briz-KM Upper Stage I would assume?

All Rokot flies with it, or it isn't a Rokot.  ;)

I assumed! ;D But I'd look a fool if I simply didn't check.

So let's all wait to hear if this one launches on time!
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:47 UTC)
Post by: anik on 03/31/2015 12:48 PM
Early Rokots have flown with Briz-K upper stage, also there were plans of Briz-KS use with Rokots.
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:47 UTC)
Post by: Galactic Penguin SST on 03/31/2015 01:42 PM
Still on time: http://ria.ru/space/20150331/1055678978.html (http://ria.ru/space/20150331/1055678978.html)

Liftoff in 5 minutes time.
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:47 UTC)
Post by: Galactic Penguin SST on 03/31/2015 01:54 PM
Liftoff confirmed at 13:48 UTC: http://www.interfax.ru/russia/433377 (http://www.interfax.ru/russia/433377)
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Artyom. on 03/31/2015 02:08 PM
Briz-KM separation - http://ria.ru/space/20150331/1055722130.html
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Galactic Penguin SST on 03/31/2015 02:09 PM
Confirmed nominal deployment of the Briz-KM from the lower stages: http://ria.ru/space/20150331/1055722130.html (http://ria.ru/space/20150331/1055722130.html)

The satellites are expected to separate at 15:45 UTC.
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Galactic Penguin SST on 03/31/2015 02:14 PM
Hmm did I read right? The link in my last post seems to have quoted the VKO spokesperson that there's a military satellite carried along with the Gonets trio?  :-X
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Nicolas PILLET on 03/31/2015 02:19 PM
Hmm did I read right? The link in my last post seems to have quoted the VKO spokesperson that there's a military satellite carried along with the Gonets trio?  :-X

Yes, you read right ! Probably a new "Cosmos 2499".
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Chris Bergin on 03/31/2015 02:22 PM
Oh, another passenger! Cool.
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Star One on 03/31/2015 02:56 PM

Hmm did I read right? The link in my last post seems to have quoted the VKO spokesperson that there's a military satellite carried along with the Gonets trio?  :-X

Yes, you read right ! Probably a new "Cosmos 2499".

That's three of these now isn't it?
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: russianhalo117 on 03/31/2015 03:21 PM

Hmm did I read right? The link in my last post seems to have quoted the VKO spokesperson that there's a military satellite carried along with the Gonets trio?  :-X

Yes, you read right ! Probably a new "Cosmos 2499".

That's three of these now isn't it?
They have all been launched around the same time of the year and mainly into the same plane.
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: Artyom. on 03/31/2015 03:59 PM
Successful launch!

http://ria.ru/defense_safety/20150331/1055750692.html (http://ria.ru/defense_safety/20150331/1055750692.html)
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: edkyle99 on 03/31/2015 04:53 PM
Eighth orbital launch in six days.  Four of them were Navsat launches.  Navsat season I suppose.  Maybe something about the period of vernal equinox.

 - Ed Kyle
Title: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Star One on 03/31/2015 07:01 PM

Hmm did I read right? The link in my last post seems to have quoted the VKO spokesperson that there's a military satellite carried along with the Gonets trio?  :-X

Yes, you read right ! Probably a new "Cosmos 2499".

That's three of these now isn't it?
They have all been launched around the same time of the year and mainly into the same plane.

Thanks. The first one carried out various manoeuvres once on orbit, but I never saw whether the second one followed the same course of action and is the first still manoeuvring today. The last I saw on Russian Space Web was references from late January this year to further manoeuvres.
Title: Re: Rokot – Gonets-M blok № 14 – March 31, 2015 (13:48 UTC)
Post by: jcm on 03/31/2015 07:15 PM
TLEs out for three payloads and the Briz-M - nothing yet for a putative 4th payload.
Briz-M in 1170 x 1504 km disposal orbit, rest in 1494 x 1506 km, so looks like mission success for the Gonets and Briz.
I recall that Kosmos-2499 took a while to be discovered and cataloged.
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: jcm on 03/31/2015 07:23 PM
Per http://www.iss-reshetnev.ru/media/news/news-260115   (the new URL for the news item from Jan mentioned above)
these are «Гонец-М» №№21, 22, 23
- at least I assume the ones sent to the cosmodrome in Jan are the ones launched today.
Title: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Star One on 03/31/2015 07:23 PM
TLEs out for three payloads and the Briz-M - nothing yet for a putative 4th payload.
Briz-M in 1170 x 1504 km disposal orbit, rest in 1494 x 1506 km, so looks like mission success for the Gonets and Briz.
I recall that Kosmos-2499 took a while to be discovered and cataloged.

Was the second special payload given a Kosmos designation?
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: russianhalo117 on 03/31/2015 07:37 PM
TLEs out for three payloads and the Briz-M - nothing yet for a putative 4th payload.
Briz-M in 1170 x 1504 km disposal orbit, rest in 1494 x 1506 km, so looks like mission success for the Gonets and Briz.
I recall that Kosmos-2499 took a while to be discovered and cataloged.

Was the second special payload given a Kosmos designation?
yes, number is Kosmos-2504.
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Satori on 03/31/2015 08:45 PM
Launch images: http://function.mil.ru/news_page/country/more.htm?id=12012849@egNews
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Satori on 03/31/2015 08:59 PM
Short launch video...

https://www.youtube.com/watch?v=jVuRJE8lxOU
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Satori on 03/31/2015 09:09 PM
There is also a launch video posted on the Russian Ministry of Defence faceboo page at https://www.facebook.com/video.php?v=1599862353589848&fref=nf
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Star One on 03/31/2015 10:13 PM
TLEs out for three payloads and the Briz-M - nothing yet for a putative 4th payload.
Briz-M in 1170 x 1504 km disposal orbit, rest in 1494 x 1506 km, so looks like mission success for the Gonets and Briz.
I recall that Kosmos-2499 took a while to be discovered and cataloged.

Was the second special payload given a Kosmos designation?
yes, number is Kosmos-2504.
Thanks for the Information.
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Galactic Penguin SST on 03/31/2015 11:07 PM
Short launch video...

https://www.youtube.com/watch?v=jVuRJE8lxOU

Better version:

https://www.youtube.com/watch?v=_uFWLGeMHSc
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: input~2 on 04/01/2015 06:58 AM
A fifth object has been catalogued in an orbit close to that of object D (could be Kosmos-2504 in an orbit close to that of Briz-KM)
2015-020E/40556 in 1172 x 1506 km x 82.49°
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: satwatcher on 04/01/2015 09:02 AM
The object currently classified as 40555/2015-020D is transmitting at the same radio frequency as COSMOS-2491 and COSMOS-2499. It is highly likely that 40555/2015-020D is COSMOS-2504.
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: jcm on 04/15/2015 05:36 AM
Kosmos-2504 has begun manuevers in orbit.
On Apr 9 the orbit was raised by about 3 km. Further changes continued on Apr 13-14.
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: B. Hendrickx on 04/24/2015 09:06 PM
There appears to have been a rendezvous between Kosmos-2504 and the Briz-KM upper stage around April 16, with the Briz-KM eventually ending up in a higher orbit.

Here's an update on the website of Anatoly Zak, who speculates there may have been some kind of physical contact between the two objects.

http://www.russianspaceweb.com/Cosmos-2504.html
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Stan Black on 06/16/2015 11:11 PM
Kosmos-2504 is article 14Ф153?

Quote
Оказание услуг по подготовке и запуску РКН «Рокот» 14А05-АС11М № 72526 с блоком космических аппаратов 372 АС71М (КА «Гонец-М» № 21,22,23, КА14Ф153)  с космодрома «Плесецк»
http://tsenki.com/upload/iblock/da1/План%20закупок%20ЦЭНКИ%20на%202015%20год%20версия%209.xlsx
http://tsenki.com/partners_customers/purchases/guidelines/
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: jcm on 07/09/2015 11:13 PM
As noted by Anatoliy and Igor in other forums, Kosmos-2504 made a major orbit change on Jul 3.

On Jul 3 around 0710 orbit changed from 1172 x 1506 km to 1117 x 1455 km
Later on Jul 3 this was tweaked to 1119 x 1452 km  (or,  might be just a more accurate measurement)

The Briz-KM stage is still in a 1172 x 1506 km orbit, no change since the Apr 14 orbit perturbation noted by Anatoliy.

Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Olaf on 04/21/2017 03:27 PM
https://twitter.com/RussianSpaceWeb/status/855419791791857665
Quote
#Russia's mystery satellite comes back to life, supposedly! Details: http://russianspaceweb.com/Cosmos-2504.html#2017 … #Kosmos2504
Title: Re: Rokot – Three Gonets-M (blok № 14); Kosmos-2504 – March 31, 2015 (13:47:56 UTC)
Post by: Liss on 04/27/2017 02:14 PM
From 30 Mar 2017 till 20 Apr 2017 K2504 has descended in several paces by 500 km in perigee height.