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Most Accurate current catalog for brighter than Mag6 stars

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#1 Anurag Shevade

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Posted 22 June 2019 - 12:03 AM

Hi all!

Seeking info on which is the most accurate star catalog in terms of proper motion and epoch references to current?

 

I know GAIA is the latest and the most accurate one but it looks like it does not have entries for bright stars. Checked Sky Safari, there is no cross ref GAIA id for bright stars and CDC download options also mention no GAIA stars for bright HIP catalog stars. Is there any other modern catalog in currnet decade which has successfully measured bright stars?

 

Clear Skies! 


Edited by Anurag Shevade, 22 June 2019 - 01:12 AM.


#2 han59

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Posted 22 June 2019 - 02:00 AM

Up to magnitude 6  best complete database is Tycho/Hip. This is second to Gaia but the only catalog complete in the bright end. The Epoch is 1991.25 so the date of observation but most program will use the proper motion to calculate the position for any epoch.

 

Up to magnitude 6 is very modest. Note there are "ready to use" Gaia & Tycho hybrid databases for Skychart/CDC, ASTAP and HNSKY. For compactness (a few hundred megabytes for up to magnitude 17), the epoch is fixed at 2022.

 

For Gaia star ID's are no longer practical. The catalog number changes with every Gaia data release. It is better to reference the stars using IAU designation based on the recorded RA, DEC position as hhmmss.s+ddmmss.

 

Han


Edited by han59, 22 June 2019 - 07:22 AM.

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#3 Anurag Shevade

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Posted 22 June 2019 - 07:00 AM

Thanks for the info Han.

 

The hybrid database is indeed very compact for the magnitude coverage it does.

Nice that many software can use it.

 

Clear Skies!



#4 catalogman

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Posted 22 June 2019 - 01:17 PM

 

For Gaia star ID's are no longer practical. The catalog number changes with every Gaia data release. <snip>

 

Another problem with GAIA is that it is complete only from about G=12 to G=17; brighter stars blend together
due to over-saturation or are missing, so their distribution does not match the sky.

 

Up to magnitude 6  best complete database is Tycho/Hip. This is second to Gaia but the only catalog complete in the bright end. <snip>

 

 

 

Actually, some of the well-known catalogues (such as the UCAC4 and NOMAD) are complete at the bright end, but only because the brightest stars were added afterward:

https://irsa.ipac.ca...CAC4/ucac4.html

https://www.usno.nav...on/catalog-info

 

But extracting the brightest stars from these catalogues wouldn't satisfy the OP because there are no Bayer/Flamsteed labels.

 

Other than the YBS (from 1991), the only other catalogue that might satisfy the OP is the HYG:

 

http://www.astronexus.com/hyg

 

If Column N is sorted numerically, there are 8,827 stars brighter than mag 6.5.

 

--catalogman


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#5 han59

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Posted 22 June 2019 - 02:54 PM

Yes it is correct that still some stars are missing in Gaia DR2 but completeness  is as good or better as other catalogues. The Tycho-2 supplement linked in my previous mail makes it almost perfect.

 

The UCAC4 and YBS are build on Tycho/Hip data



#6 Anurag Shevade

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Posted 22 June 2019 - 04:20 PM

May be some other wavelength than optical band may provide accuracy for bright stars movement across the frame of reference by not saturating sensors.

 

Was looking for it for a very different purpose. We will soon get information about it 1st hand.

 

Clear Skies!



#7 Anurag Shevade

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Posted 22 June 2019 - 04:27 PM

Another problem with GAIA is that it is complete only from about G=12 to G=17; brighter stars blend together
due to over-saturation or are missing, so their distribution does not match the sky.

 

Actually, some of the well-known catalogues (such as the UCAC4 and NOMAD) are complete at the bright end, but only because the brightest stars were added afterward:

https://irsa.ipac.ca...CAC4/ucac4.html

https://www.usno.nav...on/catalog-info

 

But extracting the brightest stars from these catalogues wouldn't satisfy the OP because there are no Bayer/Flamsteed labels.

 

Other than the YBS (from 1991), the only other catalogue that might satisfy the OP is the HYG:

 

http://www.astronexus.com/hyg

 

If Column N is sorted numerically, there are 8,827 stars brighter than mag 6.5.

 

--catalogman

Thanks for HYG reference Catalogman!


Edited by Anurag Shevade, 22 June 2019 - 04:30 PM.


#8 Patrick Chevalley

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Posted 23 June 2019 - 04:50 AM

The default bright star catalog in CdC is the Extended Hipparcos Compilation (XHIP) available from http://cdsarc.u-stra...-bin/cat/V/137D

 

The main advantage over the standard Hipparcos catalog is the addition of radial velocity from other source that allow much more precise proper motion computation for long time range.

It also add more photometry and spectral class information.

 

 


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#9 Anurag Shevade

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Posted 24 June 2019 - 05:00 AM

Dear Patrick

Thank you so much for XHIP capabilities info. With this reference, read one very interesting page about some of the aspects of how people made the data of original HIP more accurate.

http://sci.esa.int/h...cos-catalogues/

 

Also glad that its available in CdC as default. When right clicked on object, the context menu of CdC also provides all the info about object with nice selectable text neatly organized with all alternate catalog names in separate lines. This arrangement helps a lot and we were able to effortlessly extract into excel for further processing.

 

Thanks to you for the great work of creating this software and adding new capabilities in it with thorough consistency spanning decades! Have found that CdC is almost always the first planetarium software to incorporate any new catalog that becomes available. I like this capability in addition to many other things.

 

Regards

Anurag


Edited by Anurag Shevade, 24 June 2019 - 05:05 AM.


#10 catalogman

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Posted 23 August 2019 - 10:48 PM

For the OP, attached is a catalogue of 8,482 stars in XHIP that are mag V=6.5 or brighter (limit same as the YBS).

 

The data columns refer to the info from SIMBAD:

 

#MAIN_ID......main identifier
#RA_2000.0....ICRS RA (ep=J2000)
#DEC_2000.0...ICRS Dec (ep=J2000)
#PM(RA).......Proper motion in RA (mas/yr)
#PM(DEC)......Proper motion in Dec (mas/yr)
#RV...........Radial velocity (km/s)
#PAR..........Parallax (mas)
#B............B-magnitude
#V............V-magnitude
#OTYPE........Object type
#SPEC.........Spectrum type

 

Only 80 of the 8,482 stars are missing one column of information, so the catalogue
is more than 99% complete.

 

Bayer and Flamsteed labels from SIMBAD are also included.

 

--catalogman

Attached Files


Edited by catalogman, 24 August 2019 - 06:28 AM.

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#11 Anurag Shevade

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Posted 27 August 2019 - 05:34 PM

Dear Catalogman

thanks a lot for catalog with all the info!

 

Regards

Anu


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