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Mu2 Boötis

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Mu2 Boötis
Diagram showing star positions and boundaries of the Boötes constellation and its surroundings
Diagram showing star positions and boundaries of the Boötes constellation and its surroundings

Location of μ2 Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
A
Right ascension 15h 24m 30.86726s[1]
Declination +37° 20′ 50.2761″[1]
Apparent magnitude (V) 6.98[2]
B
Right ascension 15h 24m 30.89704s[3]
Declination +37° 20′ 52.5550″[3]
Apparent magnitude (V) 7.63[2]
Characteristics
Spectral type F9V + G0V[4]
U−B color index +0.13[5]
B−V color index +0.59[5]
Astrometry
A
Proper motion (μ) RA: −139.142[1] mas/yr
Dec.: +90.281[1] mas/yr
Parallax (π)27.2223±0.0168 mas[1]
Distance119.81 ± 0.07 ly
(36.73 ± 0.02 pc)
B
Proper motion (μ) RA: −152.149[3] mas/yr
Dec.: +89.593[3] mas/yr
Parallax (π)27.2126±0.0181 mas[3]
Distance119.85 ± 0.08 ly
(36.75 ± 0.02 pc)
Orbit[4]
PrimaryA
CompanionB
Period (P)265 yr
Semi-major axis (a)1.46″
Eccentricity (e)0.585
Inclination (i)135.5°
Longitude of the node (Ω)174°
Periastron epoch (T)1864.9
Argument of periastron (ω)
(secondary)
338°
Details
A
Mass1.24[4] M
Radius1.23[1] R
Luminosity1.75[1] L
Surface gravity (log g)4.3[4] cgs
Temperature6,000[4] K
Rotational velocity (v sin i)5[4] km/s
Age5.6[1] Gyr
B
Mass1.05[4] M
Radius1.09[3] R
Luminosity1.06[3] L
Surface gravity (log g)4.4[4] cgs
Temperature5,900[4] K
Rotational velocity (v sin i)9[4] km/s
Age11.3[3] Gyr
Other designations
51 Boo B, BD+37°2637, GC 20725, GJ 3904, HD 137392, HIP 75415, HR 5734, SAO 64687
Database references
SIMBADdata

Mu2 Boötis is a binary star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from μ2 Boötis, and abbreviated Mu2 Boo or μ2 Boo. Based on parallax measurements, these stars are located at a distance of approximately 120 light-years from the Sun.

The components of μ2 Boötis have apparent magnitudes of +7.0 and +7.6.[2] They have similar spectral types, F9V and G0V respectively, and complete one orbit about their common centre of mass every 260 years.[4]

The system μ1 Boötis is at a similar distance and share similar proper motions with μ2, but has a significantly different chemical composition, so they are not gravitationally bound.[4]

References

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  1. ^ a b c d e f g h 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.
  2. ^ a b c Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049.
  3. ^ a b c d e f g h 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. ^ a b c d e f g h i j k l Kiyaeva, O. V.; et al. (November 2014). "The multiple system ADS 9626: A quadruple star or an encounter of two binaries?". Astronomy Reports. 58 (11): 835–848. Bibcode:2014ARep...58..835K. doi:10.1134/S106377291411002X. S2CID 122667185.
  5. ^ a b Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.