Omicron Andromedae
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Andromeda |
| Right ascension | 23h 01m 55.2643s |
| Declination | +42° 19' 33.525"' |
| Apparent magnitude (V) | 3.633 / 3.6 |
| Characteristics | |
| Spectral type | B6IIIep |
| U-B color index | -0.53 |
| B-V color index | -0.09 |
| Variable type | Eclipsing binary of beta Lyr |
| Astrometry | |
| Radial velocity (Rv) | -14.0 km/s |
| Proper motion (μ) | RA: 22.47 mas/yr Dec.: 0.24 mas/yr |
| Parallax (π) | 4.71 ± 0.67 mas |
| Distance | approx. 690 ly (approx. 210 pc) |
| Absolute magnitude (MV) | 3.552 |
| Details | |
| Mass | ? M☉ |
| Radius | ? R☉ |
| Surface gravity (log g) | ? |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Visual binary orbit | |
| Companion | ο Andromedae a |
| Period (P) | 33.01 yr |
| Semimajor axis (a) | 0.1" |
| Visual binary orbit | |
| Companion | ο Andromedae B |
| Period (P) | 68.6 yr |
| Semimajor axis (a) | 0.2" |
| Inclination (i) | 340° |
| Other designations | |
|
FK5 869, JP11 3570, TYC 3224-3434-1, 1 And, GC 32095, 2MASS J23015527+4219334, UBV 19739, omi And, GCRV 14449, N30 5064, UBV M 26780, BLA 12Aa, PLX 5578, VDB 156, WRH 37AB, [GSC]] 03224-03434, PMC 90-93 612, MCA 77AB, HD 217676, PPM 63726, AAVSO 2257+41, AG+42° 2238, HD 217675, ROT 3351, BD+41° 4664, HIC 113726, SAO 52609, HIP 113726, CDS 1436, HR 8762, TD1 29549.
|
|
| Database references | |
| SIMBAD | data |
Omicron Andromedae (ο And / ο Andromedae) is a star system in the constellation Andromeda. It is approximately 692 light years from Earth.
Omicron Andromedae is a binary star, whose two components are both spectroscopic binaries themselves, making a four star system. The system as a whole is classified as a blue-white B-type giant with a mean combined apparent magnitude of +3.62.
The separation of the two brightest components, ο Andromedae A and ο Andromedae B is 0.34 arcseconds. They have an orbital period of 68.6 years. A is separated from its spectroscopic companion by 0.05 arcseconds. A is a Gamma Cassiopeiae type variable star and the system's brightness varies from magnitude +3.58 to +3.78. This, in turn, has made determination the orbital period of A's spectroscopic binary difficult. B's spectroscopic companion was discovered in 1989, and that binary has a period of 33.01 years.
[edit] Location
This star's location in the constellation Andromeda can be seen in the following diagram:
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| ο Andromedae a (BLA 12Aa) | 23h 01m 55.2643s | +42° 19' 33.525 | 3.62 | B6III+A2 | Simbad |
| ο Andromedae B (WRH 37AB) | 3.6 | Simbad |
[edit] Reference
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