Delta Boötis

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δ Boötis
Location of δ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Boötes
BD+33 2561
Right ascension 15h 15m 30.16295s[1]
Declination +33° 18′ 53.3926″[1]
Apparent magnitude (V) 3.482[2]
BD+33 2562
Right ascension 15h 15m 38.34898s[3]
Declination +33° 19′ 15.3187″[3]
Apparent magnitude (V) 7.81[4]
Characteristics
BD+33 2561
Spectral type G8 III[5]
U−B color index +0.656[2]/
B−V color index +0.951[2]/
BD+33 2562
Spectral type G0 V[4]
U−B color index +0.02[4]
B−V color index +0.59[4]
Distance
120.5 ± 0.1 ly
(36.95 ± 0.04 pc)
Details
BD+33 2561
Gyr
HIP 74674, SAO 64591[13]
Database references
SIMBADdata
SIMBADdata

Delta Boötis,

even during a Full Moon. The magnitude 7.81[4] companion can be viewed in binoculars or a small telescope.[14]

In

Chinese name for δ Boötis itself is 七公七 (Qī Gōng qī, English: the Seventh Star of Seven Excellencies.)[19]

Properties

δ Boötis in optical light

This system consists of a pair of stars located in physical proximity to each other and sharing a similar motion through space, suggesting that they may form a

Astronomical Units (AU). If they are gravitationally bound to each other, the orbital period of the system would be at least 120,000 years.[20]

The brighter member of the pair has a

G-type star.[21]

The secondary component has a stellar classification of G0 V,[4] which suggests it is a main sequence star that may be similar in physical properties to the Sun. The apparent visual magnitude of this star is 7.81,[4] making it much less luminous than the primary component.[22]

References

  1. ^
    S2CID 18759600
  2. ^
    doi:10.1093/mnras/172.3.667
  3. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  4. ^
    doi:10.1086/147852
  5. ^
    S2CID 119468042
  6. S2CID 16602121
    .
  7. ^
    doi:10.1086/317850
    .
  8. ^
    doi:10.1086/301114{{citation}}: CS1 maint: multiple names: authors list (link
    )
  9. ^
    S2CID 118361131
  10. doi:10.1088/0004-6256/135/1/209
  11. ^
    S2CID 118505114
    .
  12. ^ a b "del Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-06-14.
  13. ^ "BD+33 2562". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-06-14.
  14. ^
    ISBN 9781493908264
    .
  15. ^ "princeps". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  16. ISBN 1-933303-13-1
  17. ^ "Princeps – Constellations of Words". Retrieved 2022-10-28.
  18. ISBN 978-986-7332-25-7
    .
  19. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日
  20. University of Illinois
    , retrieved 2012-01-05
  21. Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original
    on 2012-03-18, retrieved 2012-01-16
  22. ^ The actual brightness ratio is given by 2.512Δm, where Δm is the difference in magnitude. For this pair, Δm = –4.33, so the ratio is 2.512−4.33 = 0.019. Hence the secondary component is 1.9% as bright as the primary.

External links

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