| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 23h 59m 53.83172s[1] |
| Declination | −22° 25′ 41.2163″[1] |
| Apparent magnitude (V) | 8.23[2] |
| Characteristics | |
| Spectral type | G2V[3] or G2IV[4] |
| B−Vcolor index | 0.639±0.015[2] |
| Variable type | constant[4] |
| Astrometry | |
| Radial velocity (Rv) | 1.43±0.14[1] km/s |
| Proper motion (μ) | RA: 147.026mas/yr[1] Dec.: 26.865mas/yr[1] |
| Parallax (π) | 10.5796±0.0279 mas[1] |
| Distance | 308.3 ± 0.8 ly (94.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.29[2] |
| Details | |
| Mass | 1.29±0.09[5] M☉ |
| Radius | 1.82+0.05 −0.04[6] R☉ |
| Luminosity | 3.78±0.03[6] L☉ |
| Surface gravity (log g) | 4.18±0.06[5] cgs |
| Temperature | 5,971+55 −88[6] K |
| Metallicity [Fe/H] | 0.28±0.02[5] dex |
| Rotational velocity (v sin i) | 4.2[7] km/s |
| Age | 3.0[7] Gyr |
| Other designations | |
| Axólotl,CD−23°18108,HD 224693,HIP 118319,SAO 192301 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 224693, also namedAxólotl, is astar in theequatorialconstellation ofCetus, and is positioned near the western constellation border withAquarius. It can be viewed with a smalltelescope but is too faint to be seen with the naked eye, having anapparent visual magnitude of 8.23.[2] Based onparallax measurements, the object is located at a distance of approximately 308 light-years from theSun. It is drifting further away with aradial velocity of 1.4 km/s.[1]
The star HD 224693 is namedAxólotl. The name was selected in theNameExoWorlds campaign byMexico, during the 100th anniversary of theIAU. "Axólotl" means "water animal" in the nativeNahuatl language and anaxolotl is also a species ofsalamander endemic to thevalley of Mexico.[8][9]
This is an ordinaryG-type main-sequence star with astellar classification of G2V.[3] However, in 2006, Johnson and associates assigned it a class of G2 IV, suggesting it is instead anevolvingsubgiant star.[4] It is about three[7] billion years old andchromosphericallyquiet,[4] with aprojected rotational velocity of 4.2 km/s.[7] The star ismetal rich, showing a higher abundance of elements other than hydrogen and helium when compared to the Sun.[4] It has 1.3[5] times themass of the Sun and 1.8 times theSun's radius. The star is radiating 3.78 times theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,971 K.[6]
In 2006, anextrasolar planet was discovered orbiting HD 224693 by theKeck telescope usingradial velocity measurements.[10] A preliminary search fortransits usingphotometric data fromFairborn Observatory was inconclusive because data around the predicted time of transit was too sparse to rule out possible transits.[4] This exoplanet was namedXolotl, after theAztec god of fire and lightning.[11]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Xólotl | ≥0.7±0.12 MJ | 0.191±0.014 | 26.6904±0.0019 | 0.104±0.017 | — | — |
