HD 153950

HD 153950 / Rapeto
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 17h 04m 30.87092s[1]
Declination −43° 18′ 35.1705″[1]
Apparent magnitude (V) 7.39[2]
Characteristics
Spectral type F8V[3]
Apparent magnitude (B) 7.955[2]
Apparent magnitude (J) 6.313±0.018[2]
Apparent magnitude (H) 6.078±0.034[2]
Apparent magnitude (K) 6.006±0.017[2]
B−V color index 0.565±0.011[2]
Astrometry
Radial velocity (Rv)33.23±0.01[2] km/s
Proper motion (μ) RA: +110.494[1] mas/yr
Dec.: −140.694[1] mas/yr
Parallax (π)20.6090 ± 0.0493 mas[1]
Distance158.3 ± 0.4 ly
(48.5 ± 0.1 pc)
Absolute magnitude (MV)3.91[4]
Details[4]
Mass1.119±0.027[5] M☉
Radius1.28±0.04[6] R☉
Luminosity2.22±0.17 L☉
Surface gravity (log g)4.37±0.1 cgs
Temperature6,076±13 K
Metallicity [Fe/H]−0.01±0.01 dex
Rotation14 days
Rotational velocity (v sin i)3.0 km/s
Age4.676±0.932[5] Gyr
Other designations
Rapeto, CD–43°11380, HIP 83547, SAO 227597, PPM 322565, LTT 6814, GSC 07881-00474, 2MASS J17043086-4318351[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 153950 is a star in the southern constellation of Scorpius, positioned about 1.2° to the west of Eta Scorpii.[8] It has the proper name Rapeto, which was selected in the NameExoWorlds campaign by Madagascar, during the 100th anniversary of the IAU. Rapeto is a giant creature from Malagasy tales.[9][10] This star is visible in a small telescope, having an apparent visual magnitude of 7.39.[2] It is located at a distance of 158 light years from the Sun based on parallax. The star is drifting further away with a radial velocity of 33.2 km/s.[2]

The stellar classification of F8V[3] suggests HD 153950 is an F-type main-sequence star. However, given its position on the H-R diagram, this star has likely already started to evolve off the main sequence.[11] It is about 4.7[5] billion years old and is spinning with a projected rotational velocity of 3.0 km/s, giving it a rotation period of ~14 days.[4] The star has 12%[5] more mass than the Sun and a 28%[6] greater radius. The abundance of iron, what astronomers term the star's metallicity, is equal to the Sun within the margin of error. It is radiating more than double the luminosity of the Sun from its photosphere at an effective temperature of 6,076 K.[4]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Moutou_et_al_2009 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference DelgadoMena_et_al_2019 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Stassun_et_al_2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference nameexoworlds was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference IAU was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Sato_et_al_2017 was invoked but never defined (see the help page).