HD 33519

HD 33519
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 05h 00m 13.23704s[1]
Declination −78° 18′ 00.0987″[1]
Apparent magnitude (V) 6.28±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K5/M0 III[3]
U−B color index +1.87[4]
B−V color index +1.51[4]
Astrometry
Radial velocity (Rv)−2.5±2.3[5] km/s
Proper motion (μ) RA: −17.781 mas/yr[1]
Dec.: +1.497 mas/yr[1]
Parallax (π)3.4534 ± 0.0872 mas[1]
Distance940 ± 20 ly
(290 ± 7 pc)
Absolute magnitude (MV)−0.88[6]
Details
Mass4.34[7] M☉
Radius45.4[8] R☉
Luminosity465[9] L☉
Surface gravity (log g)1.45+0.02
−0.03[1] cgs
Temperature4,118±122[8] K
Metallicity [Fe/H]−0.01[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
19 G. Mensae[12], CD−78°190, CPD−78°165, HD 33519, HIP 23251, HR 1682, SAO 256153, WDS J05002-7818A[13]
Database references
SIMBADdata

HD 33519, also known as HR 1682, is a probable spectroscopic binary[11] located in the southern circumpolar constellation Mensa. It is one of the stars near the limit of naked eye visibility, having an apparent magnitude of 6.28.[2] The system is relatively far at a distance of 940 light years[1] but is approaching with a heliocentric radial velocity of −2.5 km/s.[5] However, this value is poorly constrained.

The visible component has a stellar classification of K5/M0 III,[3] indicating an evolved red giant with the characteristics of a K5 and M0 giant star. At present it has 4.34 times the mass of the Sun[7] but has expanded to 45.4 times its girth.[8] It shines with a luminosity of 465 L☉[9] from its enlarged photosphere at an effective temperature of 4,118 K,[8] giving it an orange-red hue when viewed in the night sky. HD 33519's metallicity, what astronomers dub as elements heavier than helium, is around solar level.[10] Like most giants, it spins slowly, with its projected rotational velocity being lower than 1 km/s.[11]

There is an 11th magnitude optical companion located 50.2″ away along a position angle of 110°.[14] It has no relation to the system, having a drastically different proper motion.[14]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Mason2001 was invoked but never defined (see the help page).