R Horologii

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R Horologii
File:Horologium constellation map.png
Location of R Horologii (R) in Horologium
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Horologium
Right ascension 02h 53m 52.77010s[1]
Declination −49° 53′ 22.7305″[1]
Apparent magnitude (V) 4.7 – 14.3[2]
Characteristics
Spectral type M5-7e[3]
B−V color index 1.044±0.011[4]
Variable type Mira[5]
Astrometry
Radial velocity (Rv)+60.0±4.4[6] km/s
Proper motion (μ) RA: +128.567 mas/yr[1]
Dec.: +35.766 mas/yr[1]
Parallax (π)4.3236±0.1524 mas[1]
Distance756.0+31.6
−30.3 ly
(231.8+9.7
−9.3 pc)[7]
Details
Mass0.89[8] M☉
Radius630[9][a] R☉
Luminosity8,500[9] L☉
Surface gravity (log g)−0.44[8] cgs
Temperature2,200[10][9] K
Metallicity [Fe/H]+0.545[8] dex
Other designations
R Hor, AAVSO 0250-50, CD−50° 860, HD 18242, HIP 13502, HR 868[11]
Database references
SIMBADdata
File:RHorLightCurve.png
The light curve of R Horologii from AAVSO V band data[12]

R Horologii is a red giant star approximately 760 light-years away in the southern constellation of Horologium.[13] It is a Mira variable with a period of 404.83 days,[14] ranging from apparent magnitude 4.7 to 14.3—one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye.[2] The star is losing mass at the rate of 5.9×10−7 M☉·y−1.[10]

Notes

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  1. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    (5,7722,200)4⋅8,500=630 R⊙.

References

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  1. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  2. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  3. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  4. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Data about this star can be seen here.
  8. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  11. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  12. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
[edit | edit source]
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