Rho Serpentis
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 51m 15.90985s[1] |
| Declination | +20° 58′ 40.5166″[1] |
| Apparent magnitude (V) | 4.78[2] |
| Characteristics | |
| Spectral type | K4.5III[3] |
| U−B color index | +1.88[2] |
| B−V color index | +1.54[2] |
| Astrometry | |
| Radial velocity (Rv) | −61.96[4] km/s |
| Proper motion (μ) | RA: −53.32[1] mas/yr Dec.: +18.87[1] mas/yr |
| Parallax (π) | 8.70±0.30 mas[1] |
| Distance | 370 ± 10 ly (115 ± 4 pc) |
| Absolute magnitude (MV) | −0.56[5] |
| Details | |
| Radius | 47.84+0.49 −1.19[6] R☉ |
| Luminosity | 491.9±22.3[6] L☉ |
| Surface gravity (log g) | 1.68[7] cgs |
| Temperature | 3,930+50 −20[6] K |
| Metallicity [Fe/H] | −0.08[5] dex |
| Other designations | |
| ρ Ser, 38 Serpentis, NSV 7300, BD+21°2829, GC 21311, HD 141992, HIP 77661, HR 5899, SAO 84037[8] | |
| Database references | |
| SIMBAD | data |
Rho Serpentis, Latinized from ρ Serpentis, is a single[9] star in the Caput section of the equatorial Serpens constellation. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.78.[2] The distance to this star is approximately 375 light years based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −62 km/s.[4]
This is an aging giant star with a stellar classification of K4.5III.[3] It is a suspected variable star of unknown type, with an I-band brightness ranging from 3.29 down to 3.44 magnitude.[12] Hipparcos photometry revealed a microvariability with a frequency of 0.17017 cycles per day and an amplitude of 0.0080.[11] With the supply of hydrogen exhausted at its core, it has expanded and now has 48[6] times the Sun's girth. The star is radiating 492[6] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,930 K.[6]
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 d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
- ^ 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).
- ^ a b 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).
