| 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 |
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.
- ^ a b Cite error: The named reference
Maxtedwas invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
dr3was invoked but never defined (see the help page). - ^ a b c Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b c Cite error: The named reference
Parsons2017was invoked but never defined (see the help page). - ^ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
- ^ a b Cite error: The named reference
Rattanamala2021was invoked but never defined (see the help page). - ^ "V* RR Caeli – Eclipsing binary of Algol type (detached)". SIMBAD. Retrieved 18 February 2013.
Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).