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七公增五

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Also known as Nakkar, HD 133208, 42 Boötis, β Boötis

star in the constellation Boötes

Astronomical data · SIMBAD

Object type
PM*
Spectral type
G8IIIaFe-0.5
Distance
235 light-years
Redshift
z = -0.00006137391013805171
Coordinates
RA 225.4865° · Dec 40.3906°
View on SIMBAD →

via SIMBAD · CDS Strasbourg

Wikidata facts

Part of
Boötes
Constellation
Boötes
Distance from Earth
72.0565
Diameter
25700000
Variable-star type
flare star
Show 15 more facts
spectral class
G5
catalog code
UBV M 20520
apparent magnitude
3.244982
radial velocity
-19.4
metallicity
-0.01
absolute magnitude
-0.643
effective temperature
4966
parallax
13.878
epoch
J2000.0
stellar rotational velocity
1.30
surface gravity
620
right ascension component of proper motion
-40.708
declination component of proper motion
-30.168
right ascension
225.48650960185543
declination
40.39056857046112
Sources (1)

via Wikidata · CC0

Article · 中文

七公增五(英語:Beta Boötis),拉丁化來自“β Boötis”,也稱為“Nekkar”/nɛkɑːr/,是位於北天星座牧夫座的一顆恆星。它的視星等為3.5,使它成為星座中較亮的成員之一。在現代星座中,它標誌著牧人博蒂斯的頭部。根據依巴谷任務期間獲得的視差量測結果,該恒星距離太陽約225光年(69秒差距)。在該距離處,恆星的星等因為中間氣體和塵埃引起的消光降低了0.06。

Abstract from DBpedia / Wikipedia · CC BY-SA