Author Topic: SpaceX F9 : ANASIS-II : July 20, 2020 (Read 109932 times)

Steven Pietrobon · « **Reply #180 on:** 07/20/2020 10:31 pm »

Looks like a super synchronous geostationary transfer orbit (SSGTO) with an estimated apogee of 46,783.9 km. Spacecraft delta-V estimated at 1676.8 m/s.

Enter initial perigee height (km): 189
Enter SpaceX speed (km/h): 35857
Enter initial orbit inclination (deg): 24.95

Estimated inertial speed = 10394.5 m/s
Estimated apogee height = 46783.9 km

Enter required inclination change (deg): 24.95
Enter final orbit height (km): -1
Geosynchronous altitude = 35786.0 km

Burn at 46783.9 km: theta1 = 24.02 deg, dv1 = 1496.8 m/s
Burn at 35786.0 km: theta2 = 0.93 deg, dv2 = 180.0 m/s
dv = 1676.8 m/s

edkyle99 · « **Reply #181 on:** 07/21/2020 01:58 am »

If slightly supersynchronous, I would expect the satellite to weigh 5-ish tonnes or so, maybe 5-point-something or four-point-something.

- Ed Kyle

FutureSpaceTourist · « **Reply #182 on:** 07/21/2020 02:01 am »

https://twitter.com/launchphoto/status/1285384404412403712

Quote

Gorgeous launch the Korean satellite ANASIS-II today from pad 40!

gongora · « **Reply #183 on:** 07/21/2020 02:30 am »

https://twitter.com/TSKelso/status/1285400061489209349

Quote

CelesTrak has TLEs for 2 objects from the ANASIS-II launch on Jul 20 at 2130 UTC aboard a Falcon 9 from Cape Canaveral

Norm38 · « **Reply #184 on:** 07/21/2020 03:02 am »

Quote from: FutureSpaceTourist on 07/20/2020 10:20 pm

Yes, a first!

https://twitter.com/elonmusk/status/1285338582849208320

Convincing yourself that you can save $6 million a flight is serious motivation to keep trying to get it right.

Hard work pays off.

OneSpeed · « **Reply #185 on:** 07/21/2020 05:10 am »

Here's a comparison between ANASIS-II and the previous GTO launch, JCSAT-18 on December 17, 2019.

1. The boost phases are very similar, with both craft inserting at a perigee of 164kms.
2. However, the ANASIS-II parking orbit is much closer to circular. Its lower apogee causes ANASIS-II to arrive over the equator some 45 seconds earlier, and travelling some 35m/s faster.
3. The Oberth effect makes the subsequent ANASIS-II injection to GTO slightly more efficient than for JCSAT-18.

Steven Pietrobon · « **Reply #186 on:** 07/21/2020 07:08 am »

Quote from: Steven Pietrobon on 07/20/2020 10:31 pm

Looks like a super synchronous geostationary transfer orbit (SSGTO) with an estimated apogee of 46,783.9 km. Spacecraft delta-V estimated at 1676.8 m/s.

Actual apogee was 45,455 km, so my estimate was only 3% off! The inclination I used of 24.95° was 2° off the actual at 27.42°. Updated spacecraft delta-V is 1726.3 m/s.

Enter initial perigee height (km): 189
Enter initial apogee height (km): 45455
Enter required inclination change (deg): 27.42
Enter final orbit height (km): -1
Geosynchronous altitude = 35786.0 km

Burn at 45455.0 km: theta1 = 26.50 deg, dv1 = 1563.9 m/s
Burn at 35786.0 km: theta2 = 0.92 deg, dv2 = 162.4 m/s
dv = 1726.3 m/s

soltasto · « **Reply #187 on:** 07/21/2020 08:53 am »

I get very similar numbers:

Object A: GEO-1725.4731 m/s
Object B: GEO-1727.8796 m/s

FutureSpaceTourist · « **Reply #188 on:** 07/21/2020 09:28 am »

Ben Cooper launch photo from SpaceX website

FutureSpaceTourist · « **Reply #189 on:** 07/21/2020 03:21 pm »

Remotes are in

https://twitter.com/trevormahlmann/status/1285585505946673153

Quote

#Falcon9 lifting off beautifully from SLC-40 with the South Korean #ANASISII communication satellite on Jul 20th, 2020🚀

https://twitter.com/trevormahlmann/status/1285592033835601920

Quote

57th successful #Falcon9 landing yesterday. Here was its start on SLC-40🚀 Can't wait to see it ride back into port in a few days!

⚙️/⬇️/🖼: tmahlmann.com/photos/Rockets…

https://twitter.com/johnkrausphotos/status/1285586731996196864

Quote

Liftoff of Falcon 9 and ANASIS-II for South Korea at 5:30pm yesterday. Beautiful afternoon launch!

📷: Me for @SuperclusterHQ

https://twitter.com/superclusterhq/status/1285578958956892160

Quote

Liftoff of Falcon 9 and ANASIS-II for South Korea yesterday afternoon 🔥

Captured via remote camera by @johnkrausphotos for Supercluster

FutureSpaceTourist · « **Reply #190 on:** 07/21/2020 04:14 pm »

https://twitter.com/spacexfleet/status/1285608476568363013

Quote

Looks like JRTI and the droneship team are now departing from the LZ with B1058.2.

They will have been forced to wait until this morning to finish securing the booster. Crew do not work on the droneship at night for safety reasons.

FutureSpaceTourist · « **Reply #191 on:** 07/21/2020 04:15 pm »

twitter.com/spacexfleet/status/1285532671842680832

Quote

Recovery team reacts to yesterday's fairing catch success with a new destination name!

https://twitter.com/spacexfleet/status/1285533431078756353

Quote

1 booster + 2 fairing halves = hat-trick 😁

FutureSpaceTourist · « **Reply #192 on:** 07/21/2020 04:24 pm »

SpaceX launch photos by Ben Cooper

FutureSpaceTourist · « **Reply #193 on:** 07/21/2020 05:49 pm »

Both right on the edge ...

twitter.com/spacex/status/1285632260721573890

Quote

Videos of yesterday’s catch of both fairing halves

https://twitter.com/spacex/status/1285632635335782401

Edit to add: videos attached

edkyle99 · « **Reply #194 on:** 07/21/2020 06:24 pm »

I keep seeing it repeated that this was the 57th Falcon booster landing. I'm counting 56, even if you include the Falcon Heavy Flight 2 Core B1055.1, which landed on OSCILY, but subsequently toppled and was lost. I see 56 on a couple of other tracking sites as well.

- Ed Kyle

pb2000 · « **Reply #195 on:** 07/21/2020 06:55 pm »

Quote from: edkyle99 on 07/21/2020 06:24 pm

I keep seeing it repeated that this was the 57th Falcon booster landing. I'm counting 56, even if you include the Falcon Heavy Flight 2 Core B1055.1, which landed on OSCILY, but subsequently toppled and was lost. I see 56 on a couple of other tracking sites as well.

- Ed Kyle

Technically 1050 did land and was recovered, just with a few unexpected scratches to buff out.

intelati · « **Reply #196 on:** 07/21/2020 07:05 pm »

Quote from: pb2000 on 07/21/2020 06:55 pm

Quote from: edkyle99 on 07/21/2020 06:24 pm
I keep seeing it repeated that this was the 57th Falcon booster landing. I'm counting 56, even if you include the Falcon Heavy Flight 2 Core B1055.1, which landed on OSCILY, but subsequently toppled and was lost. I see 56 on a couple of other tracking sites as well.

- Ed Kyle
Technically 1050 did land and was recovered, just with a few unexpected scratches to buff out.

And had to be cleaned of salt water...

FutureSpaceTourist · « **Reply #197 on:** 07/21/2020 08:13 pm »

Another awesome slo-mo video

https://twitter.com/considercosmos/status/1285551724095315968

Quote

Engine closeup in flight 🔥🔭🚀
Another look at @SpaceX Falcon 9 with #ANASIS2 and telescopic tracked slomo 🕹️🎥@elonmusk

🙏crazy scope crew @OPT_Telescopes @Erdayastronaut @astroferg #SpaceX #slowmotion

smoliarm · « **Reply #198 on:** 07/21/2020 08:20 pm »

Quote from: edkyle99 on 07/21/2020 06:24 pm

I keep seeing it repeated that this was the 57th Falcon booster landing. I'm counting 56, even if you include the Falcon Heavy Flight 2 Core B1055.1, which landed on OSCILY, but subsequently toppled and was lost. I see 56 on a couple of other tracking sites as well.

- Ed Kyle

Here is what I have in my spreadsheet for successful landings:
Falcon 9
ASDS = 36
RTLS = 13
Falcon Heavy
Sides, RTLS = 6
Cores, ASDS = 1 (the transportation failed, but the landing itself was a success)

Also, there is one more case:
GovSat-1 (SES-16), Jan 31, 2018 - which was reported as a successful simulated landing (ASDS)
So, my guess - SpaceX just count this case as well.

ZachF · « **Reply #199 on:** 07/21/2020 08:46 pm »

Quote from: edkyle99 on 07/21/2020 01:58 am

If slightly supersynchronous, I would expect the satellite to weigh 5-ish tonnes or so, maybe 5-point-something or four-point-something.

- Ed Kyle

Es'hail was delivered to a GTO-1750ish trajectory and weighed 5,300kg. Since, this was sent to GTO-1726, I'd guess ~5,250kg for Anasis-II.