![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/3/30/RRCaeLightCurve.png/640px-RRCaeLightCurve.png&w=640&q=50)
RR Caeli
Double star in the constellation Caelum / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about RR Caeli?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
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.
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) | 47.2 ± 0.02 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 | 0.453±0.002[6] 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 | 0.168±0.001[6] 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 |
Close