Blue-white star · Andromeda
ο Andromedae
Also known as: ο And, HIP 113726
mag 3.6690 light-years
About
ο Andromedae is a blue-white star of magnitude 3.6 in Andromeda, about 690 light-years away.
How to find it
- ο Andromedae is in the constellation Andromeda.
- Best evenings: around late October it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
- Where on Earth: it is seen well, at least 10° up, from north of 38° S.
When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.
What you will see
- EyesVisible from the suburbs on a clear night, but lost in bright city skies.
- Binoculars (10×50)A sharp point; binoculars bring out its colour and the fainter stars around it.
- Telescope (6–8 inch)Still a point of light at any magnification — stars are too far away to show a disc. Low in the sky, bright stars twinkle and flash colours.
Stars look the same in any instrument: brighter and sharper, but never bigger.
Facts
| Designation | ο Andromedae (ο And) |
|---|---|
| Hipparcos number | HIP 113726 |
| Type | Blue-white star |
| Spectral type | B6pv SB |
| Colour | WhiteB−V colour index −0.10 |
| Magnitude | 3.6The smaller the number, the brighter. |
| Distance | 690 light-yearsThe light you see left it around 1340. |
| Proper motion | 0.023″ per year across the sky |
| Constellation | Andromeda |
| Right ascension (J2000) | 23h 01m 55.3s |
| Declination (J2000) | +42° 19′ 34″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →