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Theta2 Microscopii

October 19, 2023

For other stars with the name θ Microscopii, see Theta Microscopii.

Theta2 Microscopii (θ2 Mic) is a class A0III[3] (white giant) star in the constellation Microscopium. Its apparent magnitude is 5.76[2] and it is approximately 390 light years away based on parallax.[1] It is an Ap star, a chemically peculiar star with unusually strong metallic spectral lines.[9]

θ2 Microscopii
Location of θ2 Microscopii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Microscopium
Right ascension 21h 24m 24.81796s[1]
Declination −41° 00′ 24.1033″[1]
Apparent magnitude (V) 5.76[2]
Characteristics
Spectral type A0IIIpSi[3]
U−B color index -0.21[4]
B−V color index -0.04[5]
Astrometry
Radial velocity (Rv)+8.00[6] km/s
Proper motion (μ) RA: +24.64[1] mas/yr
Dec.: −0.25[1] mas/yr
Parallax (π)8.35 ± 0.70 mas[1]
Distance390 ± 30 ly
(120 ± 10 pc)
Absolute magnitude (MV)0.39[2]
Orbit[7]
Period (P)464.66 yr
Semi-major axis (a)0.836″
Eccentricity (e)0.210
Inclination (i)111.8°
Details
Luminosity78.22[2] L☉
Temperature10,378[8] K
Other designations
CD−41 14503, CCDM J21245-4100AB, GC 29950, HIP 105696, HR 8180, HD 203585, SAO 230667, WDS J21244-4100AB
Database references
SIMBADdata

The main star is known to be a binary, with two components A (6.24 mag) and B (6.88 mag) orbiting with a semimajor axis of 0.836" and eccentricity 0.201, with a period 464.66 years.[10] A more distant companion, C, has a separation around 78.4" and magnitude 10.3.[11]

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. Vizier catalog entry
  2. ^ a b c d 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. S2CID 119257644. Vizier catalog entry
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. ^ Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  5. ^ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. ^ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  7. ^ Marco Scardia; Jean-Louis Prieur; Luigi Pansecchi; Robert W. Argyle. "Orbital elements of double stars: ADS 11468, 13850 and 16057". IAU Circular. International Astronomical Union. Retrieved 2022-12-27.
  8. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352. Vizier catalog entry
  9. ^ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  10. ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry
  11. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry

October 19, 2023
theta2, microscopii, other, stars, with, name, microscopii, theta, microscopii, class, a0iii, white, giant, star, constellation, microscopium, apparent, magnitude, approximately, light, years, away, based, parallax, star, chemically, peculiar, star, with, unus. For other stars with the name 8 Microscopii see Theta Microscopii Theta2 Microscopii 82 Mic is a class A0III 3 white giant star in the constellation Microscopium Its apparent magnitude is 5 76 2 and it is approximately 390 light years away based on parallax 1 It is an Ap star a chemically peculiar star with unusually strong metallic spectral lines 9 82 MicroscopiiLocation of 82 Microscopii circled Observation dataEpoch J2000 Equinox J2000Constellation MicroscopiumRight ascension 21h 24m 24 81796s 1 Declination 41 00 24 1033 1 Apparent magnitude V 5 76 2 CharacteristicsSpectral type A0IIIpSi 3 U B color index 0 21 4 B V color index 0 04 5 AstrometryRadial velocity Rv 8 00 6 km sProper motion m RA 24 64 1 mas yr Dec 0 25 1 mas yrParallax p 8 35 0 70 mas 1 Distance390 30 ly 120 10 pc Absolute magnitude MV 0 39 2 Orbit 7 Period P 464 66 yrSemi major axis a 0 836 Eccentricity e 0 210Inclination i 111 8 DetailsLuminosity78 22 2 L Temperature10 378 8 KOther designationsCD 41 14503 CCDM J21245 4100AB GC 29950 HIP 105696 HR 8180 HD 203585 SAO 230667 WDS J21244 4100ABDatabase referencesSIMBADdataThe main star is known to be a binary with two components A 6 24 mag and B 6 88 mag orbiting with a semimajor axis of 0 836 and eccentricity 0 201 with a period 464 66 years 10 A more distant companion C has a separation around 78 4 and magnitude 10 3 11 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 Vizier catalog entry a b c d 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 S2CID 119257644 Vizier catalog entry a b Hoffleit D Warren W H 1995 VizieR Online Data Catalog Bright Star Catalogue 5th Revised Ed Hoffleit 1991 VizieR On line Data Catalog V 50 Originally Published in 1964BS C 0H 5050 Bibcode 1995yCat 5050 0H Mermilliod J C 2006 VizieR Online Data Catalog Homogeneous Means in the UBV System Mermilliod 1991 VizieR On line Data Catalog II 168 Originally Published in Institut d Astronomie 2168 Bibcode 2006yCat 2168 0M Vizier catalog entry Mallama A 2014 Sloan Magnitudes for the Brightest Stars The Journal of the American Association of Variable Star Observers 42 2 443 Bibcode 2014JAVSO 42 443M Vizier catalog entry Kharchenko N V Scholz R D Piskunov A E Roser S Schilbach E 2007 Astrophysical supplements to the ASCC 2 5 Ia Radial velocities of 55000 stars and mean radial velocities of 516 Galactic open clusters and associations Astronomische Nachrichten 328 9 889 arXiv 0705 0878 Bibcode 2007AN 328 889K doi 10 1002 asna 200710776 S2CID 119323941 Marco Scardia Jean Louis Prieur Luigi Pansecchi Robert W Argyle Orbital elements of double stars ADS 11468 13850 and 16057 IAU Circular International Astronomical Union Retrieved 2022 12 27 McDonald I Zijlstra A A Boyer M L 2012 Fundamental parameters and infrared excesses of Hipparcos stars Monthly Notices of the Royal Astronomical Society 427 1 343 357 arXiv 1208 2037 Bibcode 2012MNRAS 427 343M doi 10 1111 j 1365 2966 2012 21873 x S2CID 118665352 Vizier catalog entry Renson P Manfroid J 2009 Catalogue of Ap HGMN and Am stars Astronomy and Astrophysics 498 3 961 Bibcode 2009A amp A 498 961R doi 10 1051 0004 6361 200810788 Malkov O Yu Tamazian V S Docobo J A Chulkov D A 2012 Dynamical masses of a selected sample of orbital binaries Astronomy amp Astrophysics 546 A69 Bibcode 2012A amp A 546A 69M doi 10 1051 0004 6361 201219774 Vizier catalog entry Mason Brian D Wycoff Gary L Hartkopf William I Douglass Geoffrey G Worley Charles E 2001 The 2001 US Naval Observatory Double Star CD ROM I The Washington Double Star Catalog The Astronomical Journal 122 6 3466 Bibcode 2001AJ 122 3466M doi 10 1086 323920 Vizier catalog entry Retrieved from https en wikipedia org w index php title Theta2 Microscopii amp oldid 1166481865, wikipedia, wiki, book, books, library,

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