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] |
Distance | 940 ± 20 ly (290 ± 7 pc) |
Absolute magnitude (MV) | −0.88[6] |
Details | |
Mass | 4.34[7] M☉ |
Radius | 45.4[8] R☉ |
Luminosity | 465[9] L☉ |
Surface gravity (log g) | 1.45+0.02 −0.03[1] cgs |
Temperature | 4,118±122[8] K |
Metallicity [Fe/H] | −0.01[10] dex |
Rotational velocity (v sin i) | <1[11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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]