28 Cancri

28 Cancri

A light curve for CX Cancri, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 08h 28m 36.78530s[2]
Declination +24° 08′ 41.7179″[2]
Apparent magnitude (V) 6.05[3]
Characteristics
Spectral type F0 Vn[4]
U−B color index +0.13[3]
B−V color index +0.22[3]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)+9.0±4.3[6] km/s
Proper motion (μ) RA: −30.946[2] mas/yr
Dec.: −39.719[2] mas/yr
Parallax (π)8.4885 ± 0.1539 mas[2]
Distance384 ± 7 ly
(118 ± 2 pc)
Absolute magnitude (MV)0.41[7]
Details
Mass2.36±0.11[8] M☉
Radius3.7[2] R☉
Luminosity44[2] L☉
Surface gravity (log g)3.61[2] cgs
Temperature7,516+52
−103[8] K
Metallicity [Fe/H]+0.16[9] dex
Rotational velocity (v sin i)133[8] km/s
Age737[2] Myr
Other designations
28 Cnc, CX Cnc, BD+24°1931, HD 71496, HIP 41574, HR 3329, SAO 80204[10]
Database references
SIMBADdata

28 Cancri is a star system in the zodiac constellation of Cancer. It is a variable star with the designation CX Cancri, and is close to the lower limit of visibility with the naked eye, having a mean apparent visual magnitude of 6.05.[3] The annual parallax shift seen from Earth's orbit is 8.5 mas, which provides a distance estimate of about 384 light years. It is moving away from the Sun with a radial velocity of around +9 km/s.[6]

Based upon proper motion variation, this is an astrometric binary system with high likelihood (99.8%).[11] The visible component has a stellar classification of F0 Vn,[4] indicating it is a F-type main-sequence star with "nebulous" lines due to rapid rotation. It is a Delta Scuti variable star with a period of 0.0960 days and an amplitude of 0.020 in magnitude.[12] With 2.4 times the mass of the Sun it is spinning with a high projected rotational velocity of 133 km/s. 28 Cancri is radiating roughly 44 times the Sun's luminosity from its photosphere at an effective temperature of around 7,516 K.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference dr3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Oja1991 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference forest2011 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  10. ^ "28 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
  11. ^ Cite error: The named reference Frankowski2007 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Rodriguez2000 was invoked but never defined (see the help page).