HD 45652

HD 45652 / Lusitânia
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Monoceros
Right ascension 06h 29m 13.1919s[1]
Declination +10° 56′ 02.0061″[1]
Apparent magnitude (V) 8.10[2]
Characteristics
Spectral type G8-K0[3]
B−V color index 0.846±0.020[2]
V−R color index 0.5[4]
R−I color index 0.4[4]
Astrometry
Radial velocity (Rv)−5.040±0.0008[5] km/s
Proper motion (μ) RA: 206.328±0.106[1] mas/yr
Dec.: −62.573±0.089[1] mas/yr
Parallax (π)28.6622 ± 0.0551 mas[1]
Distance113.8 ± 0.2 ly
(34.89 ± 0.07 pc)
Absolute magnitude (MV)5.42[2]
Details
Mass0.83±0.05 M☉[3]
0.94±0.02 M☉[6]
0.91±0.03[7] M☉
Radius0.91±0.02[6] R☉
Luminosity0.61±0.01[6] L☉
Surface gravity (log g)4.49±0.03[6] cgs
Temperature5,342±31[6] K
Metallicity [Fe/H]0.286±0.032[7] dex
Rotational velocity (v sin i)3.5[7] km/s
Age5.4±2.7[6] Gyr
Other designations
Lusitânia, BD+11 1197, GC 8415, HD 45652, HIP 30905, SAO 95735, NLTT 16570[4]
Database references
SIMBADdata

HD 45652 is a star with an exoplanetary companion in the equatorial constellation of Monoceros. It was officially named Lusitânia on 17 December 2019, after the IAU100 press conference in Paris by the IAU (International Astronomical Union).[8] This star has an apparent visual magnitude of 8.10,[2] making it an 8th magnitude star that is too dim to be visible to the naked eye. The system is located at a distance of 114 light-years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of −5 km/s.[5] It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.188 arcsec yr−1.[9]

The measured atmospheric properties match a metal-rich late G- or early K-type dwarf star.[3] It is a middle-aged main sequence star, about five billion years old,[6] and is chromospherically inactive.[3] The star is smaller and less massive than the Sun.[6] It is radiating 61%[6] of the Sun's luminosity from its photosphere at an effective temperature of 5,342 K.[6] HD 45652 is spinning with a projected rotational velocity of 3.5 km/s.[7]

  1. ^ a b c d e f Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Santos2008 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference simbad was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h i j Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Gonzalez_et_al_2010 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference IAU2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).