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 | |
| Spectral type | A1V + A1V [2] |
| B−V color index | +0.06 [2] |
| Astrometry | |
| Radial velocity (Rv) | -17.20[3] km/s |
| Proper motion (μ) | RA: -60.86[1] mas/yr Dec.: -43.69[1] mas/yr |
| Parallax (π) | 17.16 ± 0.67[1] mas |
| Distance | 190 ± 7 ly (58 ± 2 pc) |
| Absolute magnitude (MV) | 0.68 [4] |
| Other designations | |
| Database references | |
| SIMBAD | data |
Iota Serpentis (ι Ser, ι Serpentis) is a star 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 A-type main sequence dwarfs and both have apparent magnitudes of +5.3. This binary has an orbital period variously reported as 11[5] or 22[6] years; spectroscopic evidence indicates a third companion of A and B. A and B also have two distant companions, Iota Serpentis C, a 13th magnitude star 143 arcseconds away and Iota Serpentis D, a 12th magnitude star 151 arcseconds distant.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Absolute magnitude calculated as
, where 
is the star's absolute magnitude, 
is the star's apparent magnitude, and 
is the star's measured parallax in arcseconds. - ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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