31 Aquilae: Difference between revisions
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Revision as of 19:35, 11 November 2008
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 24m 58.2004s |
| Declination | +11° 56′ 39.896″ |
| Apparent magnitude (V) | 5.16 |
| Characteristics | |
| Spectral type | G8IV |
| U−B color index | 0.45 |
| B−V color index | 0.77 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | -100.1 km/s |
| Proper motion (μ) | RA: 721.36 mas/yr Dec.: 643.67 mas/yr |
| Parallax (π) | 66.01 ± 0.77 mas |
| Distance | 49.4 ± 0.6 ly (15.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 5.93 |
| Details | |
| Mass | 1,1 M☉ |
| Radius | 1,1 R☉ |
| Luminosity | 1,2 L☉ |
| Temperature | 5,000–6,000 K |
| Metallicity | ? |
| Rotation | < 17 Km/s 0,008981 Year |
| Age | ? years |
| Orbit | |
| Companion | 31 Aquilae B |
| Semi-major axis (a) | 98.7″ |
| Inclination (i) | 335° |
| Orbit | |
| Companion | 31 Aquilae C |
| Semi-major axis (a) | 114.2″ |
| Inclination (i) | 316° |
| Other designations | |
b Aql, NSV 11994, GCRV 11861, LTT 15668, SRS 31503, 2MASS J19245822+1156401, TD1 24621, GJ 759, N30 4300, TYC 1063-519-1, AG+11° 2263, HD 182572, NLTT 47763, UBV 16443, ASCC 976604, HIC 95447, PLX 4541, UBV M 23748, BD+11° 3833, HIP 95447, PMC 90-93 1065, USNO-B1.0 1019-00522349, [[
CCDM]] J19249+1157A, HR 7373, PM 19226+1150, YZ 11 7220, Ci 20 1152, IDS 19202+1143 A, PPM 136256, CSI+11 3833 1, IRAS 19226+1150, ROT 2792, CSV 101833, LFT 1477, SAO 104807, FK5 1503, LHS 3463, GC 26809, LSPM J1924+1156, SPOCS 840. | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
31 Aquilae (b Aquilae) is a subgiant star in the constellation Aquila. Its apparent magnitude is 5.17. Its age is probably similar to NGC 188,the oldest open cluster known, which was calculated to be over 5 billion years. For its age, it is surprisingly metal rich, contrary to common assumptions that the oldest stars should be metal-poor.
References
Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| 31 Aquilae B (HD 231345) | 19h 24m 51.8595s | +11° 57' 14.692 | 8.56 | G0 | Simbad |
| 31 Aquilae C (BD+11 3833C) | 19h 24m 50.8s | +11° 57' 36 | 10.6 | Simbad |
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