Lambda Cancri

Lambda Cancri
Location of Piautos (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 20m 32.13630s[1]
Declination +24° 01′ 20.3198″[1]
Apparent magnitude (V) +5.93[2]
Characteristics
Spectral type B9.5 V[3][2]
Astrometry
Radial velocity (Rv)+23.0±4.3[4] km/s
Proper motion (μ) RA: −20.29[1] mas/yr
Dec.: −18.81[1] mas/yr
Parallax (π)5.9490 ± 0.1482 mas[5]
Distance550 ± 10 ly
(168 ± 4 pc)
Absolute magnitude (MV)+0.19[6]
Details[2]
λ Cnc A
Mass2.1+0.39
−0.32 M☉
Luminosity78[7] L☉
Surface gravity (log g)4.0±0.25 cgs
Temperature9,500±1,000 K
Rotational velocity (v sin i)188[8] km/s
Age105+287
−93 Myr
λ Cnc B
Mass0.8 M☉
Temperature4,562±154 K
Metallicity [Fe/H]−0.5 dex
Rotational velocity (v sin i)10 km/s
Other designations
Piautos, λ Cnc, 19 Cancri, BD+24° 1909, HD 70011, HIP 40881, HR 3268, SAO 80113[9]
Database references
SIMBADdata

Lambda Cancri (λ Cancri, abbreviated Lambda Cnc, λ Cnc) is a blue-white-hued spectroscopic binary star[2] in the zodiac constellation of Cancer. With a combined apparent visual magnitude of +5.93, it is faintly visible to the naked eye.[2] Based upon parallax measurements obtained during the Gaia mission, it is about 550 light-years distant from the Sun.[5]

The two components are designated Lambda Cancri A (formally named Piautos /piˈɔːtɒs/)[10] and B.

  1. ^ a b c d Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Gullikson2016 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference dr2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ "Naming Stars". IAU.org. Retrieved 18 June 2018.