HR 4072

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HR 4072
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 10h 24m 07.84606s[1]
Declination +65° 33′ 59.1239″[1]
Apparent magnitude (V) 4.93[2]
Spectral type A1:VpSiSrHg[3]
Variable type α2 CVn[4]
Parallax (π)9.61 ± 0.20[1] mas
Distance339 ± 7 ly
(104 ± 2 pc)
Surface gravity (log g)3.80[5] cgs
Temperature10,650[5] K
Rotational velocity (v sin i)3.20[5] km/s
Other designations
ET UMa, BD+66 664, GJ 9327, HD 89822, HIP 50933, HR 4072, SAO 15163, PPM 17427, PLX 2433, TYC 4150-1302-1, IRAS 10205+6549, 2MASS J10240782+6533590
Database references

HR 4072 (ET Ursae Majoris, HD 89822, HIP 50933) is a star in the constellation Ursa Major. Its apparent magnitude is 4.94. Located around 104 parsecs (340 ly) away, it is an α2 Canum Venaticorum variable of spectral type A1.


  1. ^ a b c Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. 
  3. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. 
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  5. ^ a b c Ghazaryan, S.; Alecian, G. (2016). "Statistical analysis from recent abundance determinations in Hg Mn stars". Monthly Notices of the Royal Astronomical Society. 460 (2): 1912. Bibcode:2016MNRAS.460.1912G. doi:10.1093/mnras/stw911.