HD 104985

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HD 104985
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 12h 05m 15.119s[1]
Declination +76° 54′ 20.65″[1]
Apparent magnitude (V) 5.79
Spectral type G9III
B−V color index 1.029
Proper motion (μ) RA: 147.68 ± 0.25[1] mas/yr
Dec.: –91.65 ± 0.19[1] mas/yr
Parallax (π) 10.30 ± 0.25[1] mas
Distance 317 ± 8 ly
(97 ± 2 pc)
Absolute magnitude (MV) 0.75
Mass 1.5 M
Radius 10.87 ± 0.36 R
Luminosity 55.5 L
Surface gravity (log g) 0,354567676 g cgs
Temperature 4786 K
Metallicity [Fe/H] –0.35 dex
Age 2.95 ± 0.65 Gyr
Other designations
Tonatiuh, BD+77° 461, HIP 58952, HR 4609, NLTT 29548, SAO 7500.
Database references
Extrasolar Planets
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

HD 104985, also named Tonatiuh,[2] is a helium-fusing[citation needed] yellow giant star located 97 parsecs (317 lys) from the Sun[1] in the constellation of Camelopardalis. An extrasolar planet (designated HD 104985 b, later named Meztli) is believed to orbit the star.

HD 104985 is the star's entry in the Henry Draper Catalogue. Following its discovery in 2003[3] the planet was designated HD 104985 b. In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars.[4] The process involved public nomination and voting for the new names.[5] In December 2015, the IAU announced the winning names were Tonatiuh for this star and Meztli for its planet.[6]

The winning names were those submitted by the Sociedad Astronomica Urania of Morelos, Mexico. 'Tonatiuh' was the Aztec god of the Sun; 'Meztli' was the Aztec goddess of the Moon.[7]

In 2016, the IAU organized a Working Group on Star Names (WGSN)[8] to catalog and standardize proper names for stars. In its first bulletin of July 2016,[9] the WGSN explicitly recognized the names of exoplanets and their host stars approved by the Executive Committee Working Group Public Naming of Planets and Planetary Satellites, including the names of stars adopted during the 2015 NameExoWorlds campaign. This star is now so entered in the IAU Catalog of Star Names.[2]

The HD 104985 planetary system[10]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b (Meztli) >8.3 MJ 0.95 199.505 ± 0.085 0.090 ± 0.009

See also[edit]


External links[edit]

Coordinates: Sky map 12h 05m 15.1178s, +76° 54′ 20.641″