[AstroPy] Doubt regard astroquery.gaia

[Abhijeet Patil]

That clears all the doubts. Thank you very much.

Regards
Abhijeet

On Thu, May 13, 2021 at 6:44 PM Adrian Price-Whelan <adrianmpw at gmail.com>
wrote:

> Hi Abhijeet,
>
> The returned stars are within a separation of 1 degree: the fact that they
> span a larger range of longitude (RA) values is because at a given latitude
> (Dec), an angular displacement is ∆ø=∆RA cos(Dec), so here:
>
> ∆RA ~ 2º @ Dec = 60.75º
> ∆ø ~ 2º * cos(60.75*pi/180) ~= 2º * 0.5 ~ 1º
>
> best,
> Adrian
>
> On Thu, May 13, 2021 at 8:53 AM Abhijeet Patil <
> abhijeet.patil at xaviers.edu.in> wrote:
>
>> Respected members of Astropy community,
>>
>> I am Abhijeet Patil, an MSc Physics student of St. Xaviers College,
>> Mumbai, India. In my final semester I am working on an astronomy related
>> project and I am extensively using the astropy package. I must mention that
>> the developers have done a great job in making the software. It is a very
>> useful package.
>>
>> I want to point out that, when I downloaded the GAIA data using the
>> astroquery.gaia module with radius of 1 degree data around the center of
>> NGC 2516, the plot of RA and DEC shows a different span for RA values. That
>> is, from the center of RA (119.5 degree), the data spans till 121.5 deg;
>> two times the radius selected. There is no problem for the DEC value.
>>
>> I tried with data encompassing stars within 2 degree and 5 degree from
>> the center of NGC 2516. But the same problem persists.
>>
>> Can you please provide a proper explanation for this?
>>
>> I would be glad if you correct me.
>>
>> For your reference, I have attached the respective files.
>>
>> Thank you for your kind attention.
>>
>> Regards
>> Abhijeet
>> _______________________________________________
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>>
>
>
> --
> Adrian M. Price-Whelan
> Flatiron Institute, NYC
> http://adrn.github.io
> (he / him)
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