RR Caeli
Double star in the constellation Caelum / From Wikipedia, the free encyclopedia
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RR Caeli is an eclipsing binary star in the constellation Caelum. It is 69 light years from Earth.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Caelum |
Right ascension | 04h 21m 05.563s[2] |
Declination | −48° 39′ 07.06″[2] |
Apparent magnitude (V) | 14.40[3] |
Characteristics | |
Evolutionary stage | White dwarf + red dwarf |
Spectral type | DA7.8 + M4[4] |
U−B color index | −0.42 [3] |
B−V color index | 0.52[3] |
Variable type | Algol[5] |
Astrometry | |
Proper motion (μ) | RA: 30.030[2] mas/yr Dec.: −533.886[2] mas/yr |
Parallax (π) | 47.2000 ± 0.0200 mas[2] |
Distance | 69.10 ± 0.03 ly (21.186 ± 0.009 pc) |
Orbit[4] | |
Period (P) | 7.289 h |
Semi-major axis (a) | 1.46 R☉ |
Eccentricity (e) | 0 |
Inclination (i) | 87.9° |
Semi-amplitude (K1) (primary) | 48 km/s |
Semi-amplitude (K2) (secondary) | 196 km/s |
Details[1] | |
White dwarf | |
Mass | 0.448±0.002[4] M☉ |
Radius | 0.01568±0.00009[4] R☉ |
Luminosity (bolometric) | 0.0007 ± 0.00015[note 1] L☉ |
Surface gravity (log g) | (7.67–7.72) ± 0.06 cgs |
Temperature | 7540 ± 175 K |
Red dwarf | |
Mass | (0.182–0.183) ± 0.012 M☉ |
Radius | (0.203–0.215) ± 0.015 R☉ |
Luminosity (bolometric) | 0.0038 ± 0.0013[note 1] L☉ |
Surface gravity (log g) | (5.04–5.09) ± 0.04 cgs |
Temperature | 3100 ± 113 K |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
ARICNS | data |
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