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Rho Ursae Majoris

October 15, 2023

Rho Ursae Majoris (ρ UMa) is the Bayer designation for a solitary[9] star in the northern circumpolar constellation of Ursa Major. It is faintly visible to the naked eye with an apparent visual magnitude of 4.74.[2] The distance to this star, based upon an annual parallax shift of 10.37 mas,[1] is around 315 light years.

Rho Ursae Majoris
Location of ρ Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Major
Right ascension 09h 02m 32.69092s[1]
Declination +67° 37′ 46.6280″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type M3 III[3]
U−B color index +1.84[2]
B−V color index +1.56[2]
Astrometry
Radial velocity (Rv)4.75±0.19[4] km/s
Proper motion (μ) RA: −22.83[1] mas/yr
Dec.: +18.13[1] mas/yr
Parallax (π)10.37 ± 0.25 mas[1]
Distance315 ± 8 ly
(96 ± 2 pc)
Absolute magnitude (MV)+0.06[5]
Details
Radius58[6] R☉
Luminosity464[7] L☉
Temperature3,725[7] K
Other designations
ρ UMa, 8 Ursae Majoris, BD+68°551, FK5 338, HD 76827, HIP 44390, HR 3576, SAO 14742[8]
Database references
SIMBADdata

With a stellar classification of M3 III,[3] this is a red giant star on the asymptotic giant branch.[10] It is a suspected small amplitude variable.[11] The measured angular diameter of the star after correcting for limb darkening is 5.64±0.15 mas,[12] which, at the estimated distance of this star, yields a physical size of about 58 times the radius of the Sun.[6] It is radiating 464 times the solar luminosity from its outer atmosphere at an effective temperature of about 3,725 K.[7] Based upon its motion through space, there is a 60.6% chance that this star is a member of the Sirius stream.[5]

Naming Edit

  • With π1, π2, σ1, σ2, A and d, it composed the Arabic asterism Al Ṭhibā᾽, the Gazelle.[13] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Ṭhibā were the title for seven stars : A as Althiba I, π1 as Althiba II, π2 as Althiba III, this star (ρ) as Althiba IV, σ1 as Althiba V, σ2 as Althiba VI, and d as Althiba VII[14]
  • In Chinese, 三師 (Sān Shī), meaning Three Top Instructors, refers to an asterism consisting of ρ Ursae Majoris and σ2 Ursae Majoris. Consequently, the Chinese name for ρ Ursae Majoris itself is 三師一 (Sān Shī yī, English: the First Star of Three Top Instructors.).[15]

References Edit

  1. ^ a b c d e f 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.
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ a b Marrese, P. M.; et al. (August 2003), "High resolution spectroscopy over lambda lambda 8500-8750 Å for GAIA. IV. Extending the cool MK stars sample", Astronomy and Astrophysics, 406: 995–999, Bibcode:2003A&A...406..995M, doi:10.1051/0004-6361:20030647.
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. ^ a b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
  6. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  7. ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  8. ^ "rho UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-25.{{cite web}}: CS1 maint: postscript (link)
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. ^ Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  11. ^ Percy, J. R.; et al. (1994), "Photometric surveys of suspected small-amplitude red variables. III: An AAVSO photometric photometry survey", Astronomical Society of the Pacific, 106 (700): 611–615, Bibcode:1994PASP..106..611P, doi:10.1086/133420.
  12. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  13. ^ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 444
  14. ^ 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.
  15. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 16 日

October 15, 2023
ursae, majoris, bayer, designation, solitary, star, northern, circumpolar, constellation, ursa, major, faintly, visible, naked, with, apparent, visual, magnitude, distance, this, star, based, upon, annual, parallax, shift, around, light, years, location, ursae. Rho Ursae Majoris r UMa is the Bayer designation for a solitary 9 star in the northern circumpolar constellation of Ursa Major It is faintly visible to the naked eye with an apparent visual magnitude of 4 74 2 The distance to this star based upon an annual parallax shift of 10 37 mas 1 is around 315 light years Rho Ursae MajorisLocation of r Ursae Majoris circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Ursa MajorRight ascension 09h 02m 32 69092s 1 Declination 67 37 46 6280 1 Apparent magnitude V 4 74 2 CharacteristicsSpectral type M3 III 3 U B color index 1 84 2 B V color index 1 56 2 AstrometryRadial velocity Rv 4 75 0 19 4 km sProper motion m RA 22 83 1 mas yr Dec 18 13 1 mas yrParallax p 10 37 0 25 mas 1 Distance315 8 ly 96 2 pc Absolute magnitude MV 0 06 5 DetailsRadius58 6 R Luminosity464 7 L Temperature3 725 7 KOther designationsr UMa 8 Ursae Majoris BD 68 551 FK5 338 HD 76827 HIP 44390 HR 3576 SAO 14742 8 Database referencesSIMBADdataWith a stellar classification of M3 III 3 this is a red giant star on the asymptotic giant branch 10 It is a suspected small amplitude variable 11 The measured angular diameter of the star after correcting for limb darkening is 5 64 0 15 mas 12 which at the estimated distance of this star yields a physical size of about 58 times the radius of the Sun 6 It is radiating 464 times the solar luminosity from its outer atmosphere at an effective temperature of about 3 725 K 7 Based upon its motion through space there is a 60 6 chance that this star is a member of the Sirius stream 5 Naming EditWith p1 p2 s1 s2 A and d it composed the Arabic asterism Al Ṭhiba the Gazelle 13 According to the catalogue of stars in the Technical Memorandum 33 507 A Reduced Star Catalog Containing 537 Named Stars Al Ṭhiba were the title for seven stars A as Althiba I p1 as Althiba II p2 as Althiba III this star r as Althiba IV s1 as Althiba V s2 as Althiba VI and d as Althiba VII 14 In Chinese 三師 San Shi meaning Three Top Instructors refers to an asterism consisting of r Ursae Majoris and s2 Ursae Majoris Consequently the Chinese name for r Ursae Majoris itself is 三師一 San Shi yi English the First Star of Three Top Instructors 15 References Edit a b c d e f van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Mermilliod J C 1986 Compilation of Eggen s UBV data transformed to UBV unpublished Catalogue of Eggen s UBV Data SIMBAD Bibcode 1986EgUBV 0M a b Marrese P M et al August 2003 High resolution spectroscopy over lambda lambda 8500 8750 A for GAIA IV Extending the cool MK stars sample Astronomy and Astrophysics 406 995 999 Bibcode 2003A amp A 406 995M doi 10 1051 0004 6361 20030647 de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 a b Famaey B et al January 2005 Local kinematics of K and M giants from CORAVEL Hipparcos Tycho 2 data Revisiting the concept of superclusters Astronomy and Astrophysics 430 1 165 186 arXiv astro ph 0409579 Bibcode 2005A amp A 430 165F doi 10 1051 0004 6361 20041272 S2CID 17804304 a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 96 4 5 64 10 3 AU 0 0046491 AU R 116 9 R displaystyle begin aligned 2 cdot R amp frac 96 4 cdot 5 64 cdot 10 3 text AU 0 0046491 text AU R bigodot amp approx 116 9 cdot R bigodot end aligned nbsp a b c McDonald I et al 2012 Fundamental Parameters and Infrared Excesses of Hipparcos Stars Monthly Notices of the Royal Astronomical Society 427 1 343 57 arXiv 1208 2037 Bibcode 2012MNRAS 427 343M doi 10 1111 j 1365 2966 2012 21873 x S2CID 118665352 rho UMa SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 02 25 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link Eggleton P P Tokovinin A A September 2008 A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 879 arXiv 0806 2878 Bibcode 2008MNRAS 389 869E doi 10 1111 j 1365 2966 2008 13596 x S2CID 14878976 Eggen O J 1992 Asymptotic giant branch stars near the sun The Astronomical Journal 104 275 Bibcode 1992AJ 104 275E doi 10 1086 116239 Percy J R et al 1994 Photometric surveys of suspected small amplitude red variables III An AAVSO photometric photometry survey Astronomical Society of the Pacific 106 700 611 615 Bibcode 1994PASP 106 611P doi 10 1086 133420 Richichi A et al February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 Allen Richard Hinckley 1899 Star Names and Their Meanings New York G E Stechert p 444 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 in Chinese AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 6 月 16 日 Retrieved from https en wikipedia org w index php title Rho Ursae Majoris amp oldid 1154745967, wikipedia, wiki, book, books, library,

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