Iota Serpentis
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  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 41m 33.05469s[1] |
| Declination | +19° 40′ 13.4380″[1] |
| Apparent magnitude (V) | 4.51[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B9V + A1V[3] |
| B−V color index | +0.062±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −17.20[4] km/s |
| Proper motion (μ) | RA: −60.86[1] mas/yr Dec.: −43.69[1] mas/yr |
| Parallax (π) | 17.16±0.67 mas[1] |
| Distance | 190 ± 7 ly (58 ± 2 pc) |
| Absolute magnitude (MV) | +0.69[2] |
| Orbit[5] | |
| Period (P) | 8015.0±6.3 d |
| Semi-major axis (a) | 0.21033±0.00047″ |
| Eccentricity (e) | 0.0941±0.0028 |
| Inclination (i) | 83.608±0.043° |
| Longitude of the node (Ω) | 69.684±0.033° |
| Periastron epoch (T) | 54,180±33 HMJD |
| Argument of periastron (ω) (secondary) | 80.5±1.8° |
| Details | |
| A | |
| Mass | 1.999[3] M☉ |
| B | |
| Mass | 1.984[3] M☉ |
| Other designations | |
| ι Ser, 21 Serpentis, BD+20°3138, GC 21102, HD 140159, HIP 76852, HR 5842, SAO 101682, ADS 9744, CCDM J15416+1940[6] | |
| Database references | |
| SIMBAD | data |
ι Serpentis, Latinized as Iota Serpentis and abbreviated Iot Ser, is a triple star[7] system in the constellation Serpens, in its head (Serpens Caput). It is approximately 190 light years from Earth.[1]
At the centre of the system is a spectroscopic binary, Iota Serpentis A and B. These are both white main sequence dwarfs and both have apparent magnitudes of +5.3. This binary has an orbital period variously reported as 11[8] or 22[5] years. First discovered as an astrometric binary, the pair have now been resolved and visual orbits have been derived.[5]
There are two visual companions, Iota Serpentis C, a 13th magnitude star 143 arcseconds away and Iota Serpentis D, a 12th magnitude star 151 arcseconds distant.
References
[edit | edit source]- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Vizier catalog entry
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
