HD 202908
| Observation data ICRS )
| ||
|---|---|---|
| Constellation | Equuleus | |
| A | ||
| Right ascension | 21h 18m 34.85s[1] | |
| Declination | +11° 34′ 08.2″[1] | |
| Apparent magnitude (V) | 7.25±0.03[2] | |
| B | ||
| Right ascension | 21h 18m 34.80s[1] | |
| Declination | +11° 34′ 08.0″[1] | |
| Apparent magnitude (V) | 8.87±0.14[2] | |
| Characteristics | ||
| Spectral type | G0 V (combined)[3] | |
| U−B color index | +0.07[4] | |
| B−V color index | +0.56[4] | |
| Aa | ||
| Spectral type | F9 V[5] or G1 V[6] | |
| Ab | ||
| Spectral type | G0 V[5] or G2 V[6] | |
| B | ||
| Spectral type | G1.5 V[5] or G6 V[7] | |
| A | ||
| Absolute magnitude (MV) | +3.73±0.13[2] | |
| B | ||
| Absolute magnitude (MV) | +5.35±0.19[2] | |
Semi-amplitude (K1)(primary) | 6.13±0.07 km/s | |
| Semi-amplitude (K2) (secondary) | 13.95±0.09 km/s | |
Semi-amplitude (K1)(primary) | 66.03±0.06 km/s | |
| Semi-amplitude (K2) (secondary) | 69.69±0.06 km/s | |
| Details | ||
| The System | ||
Rotational velocity (v sin i) | 10[14] km/s | |
| Aa | ||
| Mass | 1.14[15] M☉ | |
| Radius | 1.06±0.08[13] R☉ | |
| Luminosity | 1.41+0.15 −0.14[13] L☉ | |
| Ab | ||
| Mass | 1.08[15] M☉ | |
| Radius | 0.97±0.08[13] R☉ | |
| Luminosity | 1.16+0.13 −0.11[13] L☉ | |
| B | ||
Rotational velocity (v sin i) | 9[14] km/s | |
| Database references | ||
| SIMBAD | The system | |
| A | ||
| B | ||
HD 202908, also known as HIP 105200, is a
Gaia DR3 parallax measurements[9] but it is receding with a heliocentric radial velocity of 6.24 km/s.[8]
Stellar system
| Aa | |||||||||||||||
| Period = 3.966 d | |||||||||||||||
| Ab | |||||||||||||||
| Separation = 0.5″ Period = 78 y | |||||||||||||||
| B | |||||||||||||||
Hierarchy of orbits in the HD 202908 system[5]
The system was first observed by astronomer S.W. Burnham.[18]
The "A" component is a double-lined
The tertiary companion designated "B" has a class of G1.5 V, indicating that it is an ordinary
years.[10]
Physical characteristics
HD 202908 Aa and Ab have masses 1.08 and 1.14 times that of the Sunluminosity of the Sun from its photosphere and the latter radiates 1.16 times the Sun's luminosity.[13] The A subsystem has an effective temperature of 6,100 K,[13] giving it a whitish-yellow hue.
The B component has 97% the
billion years old.[12]
References
- ^ S2CID 119533755.
- ^ ISSN 0004-6256.
- S2CID 121286745.
- ^ Bibcode:1986EgUBV........0M
- ^ ISSN 0004-637X.
- ^ ISSN 0004-637X.
- S2CID 122411453.
- ^ ISSN 0035-8711.
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ ISSN 0004-6256.
- S2CID 56118016.
- ^ ISSN 0004-6361.
- ^ ISSN 0935-4956.
- ^ S2CID 56201169.
- ^ S2CID 53965918.
- ^ "HD 202908". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved March 21, 2023.
- S2CID 17128864.
- ISSN 0035-8711.
