Beta Reticuli

Source: Wikipedia, the free encyclopedia.
Beta Reticuli
Diagram showing star positions and boundaries of the Reticulum constellation and its surroundings
Location of β Reticuli (circled)
Observation data
ICRS
)
Constellation
Reticulum
Right ascension 03h 44m 11.97587s[1]
Declination −64° 48′ 24.8610″[1]
Apparent magnitude (V) +3.84[2]
Characteristics
Spectral type K0IV SB[3]
U−B color index +1.11[2]
B−V color index +1.13[2]
Distance
97 ± 2 ly
(29.9 ± 0.5 pc)
Absolute magnitude (MV)+1.46±0.03[3]
Semi-amplitude
(K1)
(primary)		5.1235±0.0025 km/s
Details
β Ret A
Gyr
β Ret B
Mass0.4±0.1[3] M☉
HR 1175, SAO 248877, WDS J03442-6448A.[5]
Database references
SIMBADdata

Beta Reticuli (Beta Ret, β Reticuli, β Ret) is

light years from our Sun
.

This is a single-lined

K-type giant star with a stellar classification of K0 IVSB:. It is between 5 and 6 billion years old, with 1.2 times the mass of the Sun and 9.3 times the Sun's radius. The companion, component B, is most likely a red dwarf with a classification in the range M0–M4.[3]

During the mid-20th century, the Dutch-American astronomer Willem Jacob Luyten proposed that the G3V star HD 24293 formed a third component of this system, based upon similar proper motions. However, this was subsequently ruled out based on more accurate measurements, since their actual distances, radial velocities, and proper motions do not match.[7]

Beta Reticuli is moving through the Galaxy at a speed of 69.2 km/s relative to the Sun. Its projected Galactic orbit carries it between 10,100 and 24,200 light years from the center of the Galaxy.[8] Beta Reticuli came closest to the Sun 319,000 years ago when it had brightened to magnitude 2.98 from a distance of 67 light years.[8]

Naming

In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, 蛇首 (Shé Shǒu), meaning Snake's Head, refers to an asterism consisting of β Reticuli and α Hydri. Consequently, β Reticuli itself is known as 蛇首二 (Shé Shǒu èr, English: the Second Star of Snake's Head.)[9]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1986EgUBV........0M
    .
  3. ^
    doi:10.1111/j.1365-2966.2009.14459.x
    .
  4. S2CID 59451347
    , A61.
  5. ^ "* bet Ret". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-13.
  6. S2CID 14878976
    .
  7. S2CID 118194112
    .
  8. ^ a b Beta Reticuli (HIP 17440) Archived January 2, 2013, at the Wayback Machine
  9. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 27 日
Retrieved from "https://en.wikipedia.org/w/index.php?title=Beta_Reticuli&oldid=1193320486"