23 Ursae Majoris

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23 Ursae Majoris
Ursa Major constellation map.svg
Red circle.svg
Location of 23 Ursae Majoris (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ursa Major [1]
23 UMa A
Right ascension 09h 31m 31.70873s [2]
Declination +63° 03′ 42.7013″ [2]
Apparent magnitude  (V)+3.65 [1]
23 UMa B
Right ascension 09h 31m 28.36401s [3]
Declination +63° 03′ 41.8990″ [3]
Apparent magnitude  (V)+9.19 [4]
Characteristics
23 UMa A
Evolutionary stage main sequence [5]
Spectral type F0IV [6]
B−V color index 0.360±0.015 [1]
23 UMa B
Evolutionary stage main sequence [4]
Spectral type K5V [7]
Astrometry
23 UMa A
Radial velocity (Rv)−10.4±0.7 [1] km/s
Proper motion (μ)RA: +107.99 [2] mas/yr
Dec.: +27.15 [2] mas/yr
Parallax (π)41.99±0.16  mas [2]
Distance 77.7 ± 0.3  ly
(23.82 ± 0.09  pc)
Absolute magnitude  (MV)+1.77 [1]
23 UMa B
Radial velocity (Rv)−2.55±0.13 [3] km/s
Proper motion (μ)RA: +108.861 [3] mas/yr
Dec.: +13.972 [3] mas/yr
Parallax (π)42.2161±0.0166  mas [3]
Distance 77.26 ± 0.03  ly
(23.688 ± 0.009  pc)
Details
23 UMa A
Mass 1.44 [8]   M☉
Radius 2.84 [8]   R☉
Luminosity 15.1 [8]   L☉
Surface gravity (log g)3.69 [8]   cgs
Temperature 6,748 [8]   K
Metallicity [Fe/H]0.17 [6]   dex
Rotational velocity (v sin i)154 [5]  km/s
Age 1.3 [6]   Gyr
23 UMa B
Mass 0.69 [8]   M☉
Radius 0.68 [8]   R☉
Luminosity0.16 [8]   L☉
Surface gravity (log g)4.61 [8]   cgs
Temperature 4,436 [8]   K
Metallicity [Fe/H]0.06 [9]   dex
Other designations
h UMa, 23 UMa, BD+63°845, FK5 355, GJ 3534, HD 81937, HIP 46733, HR 3757, SAO 14908, CCDM J09315+6303A/B [10]
Database references
SIMBAD data

23 Ursae Majoris, or 23 UMa, is a binary star system in the constellation Ursa Major, [10] located is approximately 77.7 light years from the Sun. [2] It has the Bayer designation h Ursae Majoris; 23 Ursae Majoris is the Flamsteed designation. The system is visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of +3.65. [1] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s. [1]

Contents

The primary component is a yellow-white F-type subgiant with an apparent magnitude of +3.65. It has 1.9 times the Sun's mass, 2.9 times the Sun's radius and is emitting 15 times the luminosity of the Sun [11] at an effective temperature of 6,651 K. [6] Orbiting at an angular separation of 22.7 arcseconds is the 9th magnitude secondary companion. There is a magnitude +10.5 optical companion at an angular separation of 99.6 arcseconds.

Nomenclature

With τ, υ, φ, θ, e and f, it composed the Arabic asterism Sarīr Banāt al-Na'sh, the Throne of the daughters of Na'sh, and Al-Haud, the Pond. [12] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al-Haud was the title for seven stars : f as Alhaud I, τ as Alhaud II, e as Alhaud III, this star (h) as Alhaud IV, θ as Alhaud V, υ as Alhaud VI and φ as Alhaud VII . [13]

References

  1. 1 2 3 4 5 6 7 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Van Leeuwen, F. (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, S2CID   18759600.
  3. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  4. 1 2 Hardegree-Ullman, Kevin K.; Apai, Dániel; Bergsten, Galen J.; Pascucci, Ilaria; López-Morales, Mercedes (2023). "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets". The Astronomical Journal. 165 (6): 267. arXiv: 2304.12490 . Bibcode:2023AJ....165..267H. doi: 10.3847/1538-3881/acd1ec .
  5. 1 2 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  6. 1 2 3 4 Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv: 1306.2974 , Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID   14911430, 40. See Table 3.
  7. ↑ Salama, Maïssa; Ziegler, Carl; Baranec, Christoph; Liu, Michael C.; Law, Nicholas M.; Riddle, Reed; Henry, Todd J.; Winters, Jennifer G.; Jao, Wei-Chun; Ou, James; Hermosillo Ruiz, Arcelia (2022). "An Adaptive Optics Census of Companions to Northern Stars within 25 pc with Robo-AO". The Astronomical Journal. 163 (5): 200. arXiv: 2203.11250 . Bibcode:2022AJ....163..200S. doi: 10.3847/1538-3881/ac53fc .
  8. 1 2 3 4 5 6 7 8 9 10 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 .
  9. ↑ Huson, Dylan; Cowan, Indiana; Sizemore, Logan; Kounkel, Marina; Hutchinson, Brian (2025). "Gaia Net: Toward Robust Spectroscopic Parameters of Stars of all Evolutionary Stages". The Astrophysical Journal. 984 (1): 58. arXiv: 2503.02958 . Bibcode:2025ApJ...984...58H. doi: 10.3847/1538-4357/adc2fa .
  10. 1 2 "h UMa". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-03-19.
  11. ↑ Boyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal, 746 (1): 101, arXiv: 1112.3316 , Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101, S2CID   18993744 . See Table 10.
  12. ↑ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 442.
  13. ↑ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.
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