Nu2 Canis Majoris

Source: Wikipedia, the free encyclopedia.
For other stars with this Bayer designation, see ν Canis Majoris.
ν2 Canis Majoris
Location of ν2 Canis Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 36m 41.03758s[1]
Declination −19° 15′ 21.1659″[1]
Apparent magnitude (V) 3.96[2]
Characteristics
Spectral type K1 III[2]
Distance
64.4 ± 0.3 ly
(19.75 ± 0.09 pc)
Absolute magnitude (MV)2.47[2]
Details
Gyr
HR 2429, SAO
 151702
Database references
SIMBADdata

Nu2 Canis Majoris (ν2 Canis Majoris) is a single[5] star in the southern constellation of Canis Major. It is a cool giant with two confirmed exoplanets.

Characteristics

With an

Gaia space observatory data release 2, namely 50.471 ± 0.4168.[6]

It is an evolved

K-type giant around 4.6 billion years old. Around 1.3 times as massive as the Sun, it has expanded to around 4.9 times the Sun's diameter and 11 times its luminosity.[4] In 2011, it was found to have a planet.[7]

Chinese name

In

ο1 Canis Majoris and π Canis Majoris, with other small stars in the body of the Dog[9]

Planetary system

By measuring periodic variations in the radial velocity of the host star between 2009 and 2010, the Pan-Pacific Planet Search program was able to identify a planet orbiting Nu2 Canis Majoris. An orbital fit produced a minimum mass estimate of 2.6±0.6 MJwith an orbital period of 2.1 years and an eccentricity of 0.23. Star spots were ruled out as a source for the signal with a false-alarm probability of 98.7%.[7] Further observations through 2019 detected the planet, as well as a secondary planet c in a 4:3 orbital resonance with planet b.[10]

The Nu2 Canis Majoris planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥1.895 MJ 1.761 736.9 0.055 — —
c ≥0.609 MJ 2.143 988.9 0.046 — —

References

  1. ^
    S2CID 18759600. Vizier catalog entry
  2. ^
    doi:10.1051/0004-6361:20041042-1
    .
  3. ^
    S2CID 53666931
    .
  4. ^
    S2CID 54555839
    .
  5. S2CID 14878976
    .
  6. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  7. ^
    S2CID 26948630
    .
  8. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日
  9. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Canis Major
  10. ^
    S2CID 204512658
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Nu2_Canis_Majoris&oldid=1173286375"