Phi Ursae Majoris

Phi Ursae Majoris
Location of φ Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 09h 52m 06.35437s[1]
Declination +54° 03′ 51.5962″[1]
Apparent magnitude (V) +4.60[2]
Characteristics
Spectral type A3 IV[3]
U−B color index +0.08[2]
B−V color index +0.03[2]
Astrometry
Radial velocity (Rv)−14.70[4] km/s
Proper motion (μ) RA: −6.00[1] mas/yr
Dec.: +19.16[1] mas/yr
Parallax (π)6.41 ± 0.59[1] mas
Distance510 ± 50 ly
(160 ± 10 pc)
Absolute magnitude (MV)−1.39[5]
Details
φ UMa A
Mass3.5±0.2[6] M☉
Luminosity347[6] L☉
Surface gravity (log g)3.69±0.16[7] cgs
Temperature8,769±150[7] K
Metallicity [Fe/H]−0.23±0.08[7] dex
Rotational velocity (v sin i)28[6] km/s
Other designations
φ UMi, 30 Ursae Minoris, BD+54° 1331, HD 85235, HIP 48402, HR 3894, SAO 27408 GC=13559, PPM 32355, CCDM J09521+5404AB, WDS J09521+5404AB[8]
Database references
SIMBADdata

Phi Ursae Majoris (Phi UMa, φ Ursae Majoris, φ UMa) is binary star in constellation of Ursa Major, which is separated in 0.245 arcseconds.[9] Both of components are white A-type subgiant.[10] Based upon parallax measurements, it is approximately 510 light years from Earth.[1]

Phi Ursae Majoris is moving through the Galaxy at a speed of 21.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,000 and 46,000 light years from the center of the Galaxy.[11]

Phi Ursae Majoris will come closest to the Sun 4.7 million years from now when it will brighten to magnitude 3.88 from a distance of 370 light years.[11]

Naming

References

  1. 1 2 3 4 5 6 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Johnson, H. L. (1966), "UBVRIJKL Photometry of the Bright Stars", Communications of the Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
  3. ↑ Edwards, T. W. (April 1976), "MK classification for visual binary components", Astronomical Journal, 81: 245–249, Bibcode:1976AJ.....81..245E, doi:10.1086/111879
  4. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. 1 2 3 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  7. 1 2 3 Prugniel, P.; Vauglin, I.; Koleva, M. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769.
  8. ↑ "phi UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 February 2017.
  9. ↑ Barnaby, David; Spillar, Earl; Christou, Julian.C; Drummond, Jack.D (January 2000), "Measurements of Binary Stars with the Starfire Optical Range Adaptive Optics Systems", The Astronomical Journal, 119 (1): 378–389, Bibcode:2000AJ....119..378B, doi:10.1086/301155
  10. ↑ PHI UMA (Phi Ursae Majoris)
  11. 1 2 Phi Ursae Majoris (HIP 48402) Archived 2013-04-14 at Archive.is
  12. ↑ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 442
  13. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 16 日


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