Author Topic: ESA - Gaia updates  (Read 123695 times)

Offline AegeanBlue

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Re: ESA - Gaia updates
« Reply #120 on: 04/06/2018 05:36 pm »
Solar System objects were originally scheduled for Data Release 5. They brought forward more observations of 14,099 known objects: they are putting up more points in the MPC which help reduce uncertainties. I am excited over the Solar System objects myself so I have been listening to what they have been saying. One of the last images they put up before DR1 was an explanation of what they were doing about them. All of Gaia's data is important, so for points that were not associated with fixed stars they had matched several with Solar System objects. While some where good matches, some where not so good but within limits of a poorly observed object while others were moving but did not match something known. My understanding -and I do not have any inside information - is that they are releasing observations from the first type: known well understood objects. Now the Gaia dataset is HUGE and growing, they are slowly bringing online more processing flows for more objects and as they are brought online and they are happy with their quality they get released.

After they are done with stars, galaxies and solar system objects, I guess what is left is cosmic rays. Will they release cosmic ray events in the end? Is that even possible? I have no idea

Offline Bubbinski

Re: ESA - Gaia updates
« Reply #121 on: 04/06/2018 07:20 pm »
How many exoplanets will be in the April 25 Gaia data release?
I'll even excitedly look forward to "flags and footprints" and suborbital missions. Just fly...somewhere.

Offline Star One

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Re: ESA - Gaia updates
« Reply #122 on: 04/06/2018 07:24 pm »
How many exoplanets will be in the April 25 Gaia data release?

I didn’t think there would be any?

Offline as58

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Re: ESA - Gaia updates
« Reply #123 on: 04/06/2018 07:49 pm »
How many exoplanets will be in the April 25 Gaia data release?

I didn’t think there would be any?

Yes, no exoplanets in the next release and according to current plans, not in the one after that (in 2020) either. Detecting exoplanets with Gaia requires a long period of observations, so they will be only included in the final (prime mission) release in 2022.

Offline hop

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Re: ESA - Gaia updates
« Reply #124 on: 04/06/2018 07:50 pm »
How many exoplanets will be in the April 25 Gaia data release?
More than a billion, but identifying which of the Gaia stars they orbit is left as an exercise to the reader ;)

More seriously, a summary of Gaia exoplanet potential http://sci.esa.int/gaia/58784-exoplanets/

According to https://www.cosmos.esa.int/web/gaia/release exoplanets are expected in DR5.

Since Gaia will mostly detect exoplanets by astrometry, it requires long time baselines.

Offline bolun

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Re: ESA - Gaia updates
« Reply #125 on: 04/07/2018 07:41 am »
WAITING FOR GAIA'S SECOND DATA RELEASE

Based on 22 months of observations, the second release of Gaia's data contains the position on the sky and brightness of 1 692 919 135 stars, as well as measurements of the parallax and proper motion of 1 331 909 727 stars.

It also includes a wide range of additional information: the colours of 1.38 billion stars; the radial velocities of 7 224 631 stars; information about 550 737 variable sources; an estimate of the surface temperature for 161 497 595 stars, of the extinction – a measure of the amount of dust along the line of sight – for 87 733 672 stars, and of the radius and luminosity of 76 956 778 stars.

Closer to home, the new data set also contains the position of 14 099 Solar System objects – mostly asteroids – based on more than 1.5 million observations.

The second data release of Gaia is scheduled for publication on 25 April 2018.

- Related article: How many stars to expect in Gaia's second data release

http://sci.esa.int/gaia/60147-waiting-for-gaia-s-second-data-release/

Image credit: ESA, CC BY-SA 3.0 IGO

Offline Star One

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Re: ESA - Gaia updates
« Reply #126 on: 04/07/2018 10:30 am »
Saw this mentioned elsewhere will the standard errors be in the catalogue?

Offline as58

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Re: ESA - Gaia updates
« Reply #127 on: 04/07/2018 11:13 am »
Saw this mentioned elsewhere will the standard errors be in the catalogue?

I'm not sure what exactly you mean, but detailed information about the upcoming data release can be found at https://www.cosmos.esa.int/web/gaia/dr2

Offline Star One

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Re: ESA - Gaia updates
« Reply #128 on: 04/07/2018 02:17 pm »
Saw this mentioned elsewhere will the standard errors be in the catalogue?

I'm not sure what exactly you mean, but detailed information about the upcoming data release can be found at https://www.cosmos.esa.int/web/gaia/dr2

I just saw the question asked on a astronomy forum but no one gave an answer.

Offline Hungry4info3

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Re: ESA - Gaia updates
« Reply #129 on: 04/07/2018 03:40 pm »
From the link as58 gave you,
Quote
Parallax uncertainties are in the range of up to 0.04 milliarcsecond for sources at G < 15, around 0.1 mas for sources with G=17 and at the faint end, the uncertainty is of the order of 0.7 mas at G = 20. The corresponding uncertainties in the respective proper motion components are up to 0.06 mas yr-1 (for G < 15 mag), 0.2 mas yr-1 (for G = 17 mag) and 1.2 mas yr-1 (for G = 20 mag).

Offline Star One

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Re: ESA - Gaia updates
« Reply #130 on: 04/07/2018 05:10 pm »
From the link as58 gave you,
Quote
Parallax uncertainties are in the range of up to 0.04 milliarcsecond for sources at G < 15, around 0.1 mas for sources with G=17 and at the faint end, the uncertainty is of the order of 0.7 mas at G = 20. The corresponding uncertainties in the respective proper motion components are up to 0.06 mas yr-1 (for G < 15 mag), 0.2 mas yr-1 (for G = 17 mag) and 1.2 mas yr-1 (for G = 20 mag).

Thank you.

Offline Star One

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Re: ESA - Gaia updates
« Reply #131 on: 04/21/2018 09:33 am »
Waiting for Gaia


Offline Star One

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Re: ESA - Gaia updates
« Reply #132 on: 04/22/2018 08:15 am »

Offline eeergo

Re: ESA - Gaia updates
« Reply #133 on: 04/25/2018 08:16 am »
Reminder the second data release is scheduled to be aired live less than an hour from now (11 am CEST): esa.int/live
« Last Edit: 04/25/2018 09:19 am by eeergo »
-DaviD-

Offline eeergo

Re: ESA - Gaia updates
« Reply #134 on: 04/25/2018 09:43 am »
Quote
Gaia’s all-sky view of our Milky Way Galaxy and neighbouring galaxies, based on measurements of nearly 1.7 billion stars. The map shows the total brightness and colour of stars observed by the ESA satellite in each portion of the sky between July 2014 and May 2016.
Brighter regions indicate denser concentrations of especially bright stars, while darker regions correspond to patches of the sky where fewer bright stars are observed. The colour representation is obtained by combining the total amount of light with the amount of blue and red light recorded by Gaia in each patch of the sky.
The bright horizontal structure that dominates the image is the Galactic plane, the flattened disc that hosts most of the stars in our home Galaxy. In the middle of the image, the Galactic centre appears vivid and teeming with stars.
Darker regions across the Galactic plane correspond to foreground clouds of interstellar gas and dust, which absorb the light of stars located further away, behind the clouds. Many of these conceal stellar nurseries where new generations of stars are being born.
Sprinkled across the image are also many globular and open clusters – groupings of stars held together by their mutual gravity, as well as entire galaxies beyond our own.
The two bright objects in the lower right of the image are the Large and Small Magellanic Clouds, two dwarf galaxies orbiting the Milky Way.
In small areas of the image where no colour information was available – to the lower left of the Galactic centre, to the upper left of the Small Magellanic Cloud, and in the top portion of the map – an equivalent greyscale value was assigned.
The second Gaia data release was made public on 25 April 2018 and includes the position and brightness of almost 1.7 billion stars, and the parallax, proper motion and colour of more than 1.3 billion stars. It also includes the radial velocity of more than seven million stars, the surface temperature of more than 100 million stars, and the amount of dust intervening between us and of 87 million stars. There are also more than 500 000 variable sources, and the position of 14 099 known Solar System objects – most of them asteroids – included in the release.
Acknowledgement: Gaia Data Processing and Analysis Consortium (DPAC); A. Moitinho / A. F. Silva / M. Barros / C. Barata, University of Lisbon, Portugal; H. Savietto, Fork Research, Portugal.
http://www.esa.int/spaceinimages/Images/2018/04/Gaia_s_sky_in_colour2
« Last Edit: 04/25/2018 09:44 am by eeergo »
-DaviD-

Offline eeergo

Re: ESA - Gaia updates
« Reply #135 on: 04/25/2018 10:07 am »
Quote from: @ESAGaia
We're online with #GaiaDR2. You are all so very excited to get the data we are bit overloaded! 256 users in the first two minutes alone!

All topics:

https://www.cosmos.esa.int/web/gaia/iow_20180425
« Last Edit: 04/25/2018 10:08 am by eeergo »
-DaviD-

Offline jebbo

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Re: ESA - Gaia updates
« Reply #136 on: 04/25/2018 10:10 am »
It's going to take a while to digest, but the visualisations are stunning (and some are quite unexpected)!

Offline bolun

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Re: ESA - Gaia updates
« Reply #137 on: 04/25/2018 10:14 am »

Offline bolun

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Re: ESA - Gaia updates
« Reply #138 on: 04/25/2018 10:17 am »
Gaia creates richest star map of our Galaxy - and beyond (article)

25 April 2018

https://www.esa.int/Our_Activities/Space_Science/Gaia/Gaia_creates_richest_star_map_of_our_Galaxy_and_beyond

Offline jebbo

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Re: ESA - Gaia updates
« Reply #139 on: 04/25/2018 11:13 am »
Here's the first tranche of papers, 11 of which are open access:

https://www.aanda.org/component/toc/?task=topic&id=922

Tags: gaia 
 

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