31 Aquilae: Difference between revisions
Appearance
Content deleted Content added
m Robot: removing excess stub tag |
removed nonexistent image |
||
Line 1: | Line 1: | ||
{{Starbox begin | |
{{Starbox begin | |
||
name=31 Aquilae }} |
name=31 Aquilae }} |
||
{{Starbox image |
|||
| image = [[Image:31 Aquilae.jpg|275px|]] |
|||
| caption = 31 Aquilae |
|||
}} |
|||
{{Starbox observe | |
{{Starbox observe | |
||
epoch=J2000 | |
epoch=J2000 | |
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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/Aquila_constellation_map.png/250px-Aquila_constellation_map.png)
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 |