5 Serpentis - HIP 74975

[t_ilan_s]

Yesterday I've imaged messier 5 (My second DSO ) and underneath M5 I saw hip 74975 (I believe),

which should be only one star according to Stellarium and some other pictures I saw in the web.

But when I imaged this star I could see two stars.

https://www.dropbox.com/s/mponpnhiuaa5f6x/M5.jpg

Suggestions?

[long_arms]

Hello,

On my stellarium, HIP 74975 shows the 2 stars.

Its definitely the correct object. And it looks identical to your picture (without the diffraction spikes)

Dan

[chiltonstar]

Yesterday I've imaged messier 5 (My second DSO ) and underneath M5 I saw hip 74975 (I believe),

which should be only one star according to Stellarium and some other pictures I saw in the web.

But when I imaged this star I could see two stars.

https://www.dropbox....iuaa5f6x/M5.jpg

Suggestions?

Yes, it's a double with mags ca. 5 and 11, with a separation of about 11.5 arcsec.

Chris

[t_ilan_s]

Thanks guys,

I've got the new version of stellarium but cant see a double star... Are you using any kind of plugins?

The interesting thing is that in this picture hip 74975 seems to be only one star!

http://upload.wikimedia.org/wikipedia/commons/2/2d/Messier_5_%28Globular_Cluster%29.jpg

[chiltonstar]

Thanks guys,

I've got the new version of stellarium but cant see a double star... Are you using any kind of plugins?

The interesting thing is that in this picture hip 74975 seems to be only one star!

http://upload.wikime...ar_Cluster).jpg

You need to load all the star catalogues, centre the diplay on 5 Ser by clicking on it, and then keep pressing ctrl Upkey to magnify the image to show the fainter companion.

Chris

[Tinker1947]

Its a Double in my Stellarium 0.12.0 take the FOV into 0.0800,,,,nice split then....

[chiltonstar]

Its a Double in my Stellarium 0.12.0 take the FOV into 0.0800,,,,nice split then....

Double in mine also (older version - I haven't updated).

You need to keep on enlarging the image up to see the fainter companion though.

Chris

[t_ilan_s]

Thanks again.

You know what is the speed at which those stars complete a full rotation?

I wonder if it's possible to see movement in a life time...

[Tinker1947]

It may be that there not a true double but the smaller star in many more light years to the rear but it just looks like a double. This make interesting reading on double and quadruple star,,,,,

http://en.wikipedia.org/wiki/Mizar_and_Alcor