HD 204313
Coordinates: 
21h 28m 12.2063s, −21° 43′ 34.517″
21h 28m 12.2063s, −21° 43′ 34.517″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 28m 12.20609s[1] |
| Declination | −21° 43′ 34.5182″[1] |
| Apparent magnitude (V) | 7.99[2] |
| Characteristics | |
| Spectral type | G5V[3] |
| Apparent magnitude (B) | 8.687[2] |
| Apparent magnitude (J) | 6.812±0.024[2] |
| Apparent magnitude (H) | 6.539±0.040[2] |
| Apparent magnitude (K) | 6.459±0.018[2] |
| B−V color index | 0.697±0.022[2] |
| Absolute magnitude (MV) | 4.61[2] |
| Details | |
Gyr | |
LTT 8525[6] | |
| Database references | |
Exoplanet Archive | data |
HD 204313 is a
light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −10 km/s.[1]
This is an ordinary
projected rotational velocity of just 0.8 km/s.[5] The star has a slightly larger mass and radius compared to the Sun. It is radiating 118% of the luminosity of the Sun from its photosphere at an effective temperature of 5,783 K.[4]
Planetary system
This star was in observation by the
mean motion resonance, which may be stabilizing their periods.[11]
A 2015 study independently confirmed the first two discoveries, but did not detect any significant signal at the claimed period of planet d.[12] Another study in 2022 agreed with these results, in addition to finding a new planet or brown dwarf, designated HD 204313 e to differentiate it from the dubious candidate. The inclination and true mass of planets b & e were measured via astrometry.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | ≥17.6±1.7 M🜨 | 0.2099±0.0071 | 34.905±0.012 | 0.059+0.051 −0.041 |
— | — |
| b | 4.615+1.290 −0.306 MJ |
3.185+0.130 −0.143 |
2041.1+1.7 −1.9 |
0.100±0.003 | 72.917+31.372 −21.476° |
— |
| e | 15.317+4.890 −5.183 MJ |
7.457+0.399 −0.427 |
7325.6+399.9 −369.1 |
0.253+0.071 −0.065 |
176.092+0.963 −2.122° |
— |
See also
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119257644.
- ^ Bibcode:1988mcts.book.....H
- ^ S2CID 53971692. A5.
- ^ S2CID 209405391. A136.
- ^ "HD 204313". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-16.
- S2CID 118630310, 50.
- S2CID 8864844.
- Bibcode:2011arXiv1109.2497M
- S2CID 118630310.
- S2CID 55740532, A35.
- ^ S2CID 118531921.
- ^ S2CID 251864022.
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