RR Caeli
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum |
| Right ascension | 04h 21m 05.563s |
| Declination | −48° 39′ 07.06″ |
| Apparent magnitude (V) | 14.40 |
| Characteristics | |
| Evolutionary stage | White dwarf + red dwarf |
| Spectral type | DA7.8 + M4 |
| U−B color index | −0.42 |
| B−V color index | 0.52 |
| Variable type | Algol |
| Astrometry | |
| Proper motion (μ) | RA: 30.030 mas/yr Dec.: −533.886 mas/yr |
| Parallax (π) | 47.2±0.02 mas |
| Distance | 69.10 ± 0.03 ly (21.186 ± 0.009 pc) |
| Orbit | |
| 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 | |
| White dwarf | |
| Mass | 0.453±0.002 M☉ |
| Radius | 0.01568±0.00009 R☉ |
| Luminosity (bolometric) | 0.0007 ± 0.00015 L☉ |
| Surface gravity (log g) | (7.67–7.72) ± 0.06 cgs |
| Temperature | 7540 ± 175 K |
| Red dwarf | |
| Mass | 0.168±0.001 M☉ |
| Radius | (0.203–0.215) ± 0.015 R☉ |
| Luminosity (bolometric) | 0.0038 ± 0.0013 L☉ |
| Surface gravity (log g) | (5.04–5.09) ± 0.04 cgs |
| Temperature | 3100 ± 113 K |
| Other designations | |
| RR Caeli, LFT 349, WD 0419-487, GJ 2034, 2MASS J04210556-4839070, GSC 08072-01454, Gaia DR3 4788741548375134336 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
RR Caeli is an eclipsing binary star system, located 69 light-years from Earth in the constellation Caelum. It is made up of a red dwarf star and a white dwarf, which complete an orbit around each other every seven hours. There is evidence of two circumbinary planets orbiting even further away.