Nu Tucanae

Nu Tucanae

A light curve for Nu Tucanae, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Tucana
Right ascension 22h 33m 00.06240s[2]
Declination −61° 58′ 55.6390″[2]
Apparent magnitude (V) 4.75 - 4.93[3]
Characteristics
Spectral type M4 III[4]
U−B color index +1.73[5]
B−V color index +1.61[5]
Variable type Lb:[6]
Astrometry
Radial velocity (Rv)−3.4±0.8[7] km/s
Proper motion (μ) RA: −3.40[2] mas/yr
Dec.: −0.8[2] mas/yr
Parallax (π)11.24 ± 0.23 mas[2]
Distance290 ± 6 ly
(89 ± 2 pc)
Absolute magnitude (MV)+0.16[8]
Details
Radius64.37[9] R☉
Luminosity554±41[9] L☉
Surface gravity (log g)0.778[9] cgs
Temperature3472±125[9] K
Other designations
ν Tuc, CPD−62°6348, FK5 3803, HD 213442, HIP 111310, HR 8582, SAO 255247[10]
Database references
SIMBADdata

ν Tucanae, Latinized as Nu Tucanae, is a solitary,[11] variable star in the southern constellation of Tucana. This red-hued object is visible to the naked eye as a faint star with an apparent visual magnitude that fluctuates around +4.80.[5] It is located approximately 290 light years from the Sun based on parallax,[2] but is drifting closer with a radial velocity of −3 km/s.[7]

This object is an aging red giant with a stellar classification of M4 III,[4] currently on the asymptotic giant branch.[6] With the supply of hydrogen exhausted at its core, the star has cooled and expanded off the main sequence; at present it has 49 times the Sun's radius.[12] It is classified as a slow irregular variable and its brightness varies from magnitude +4.75 to +4.93.[3] Cyclical periods of 22.3, 24.4, 24.8, 25.1, 25.5, 33.8, 50.6, 80.1, 123.2, and 261.8 days have been reported for its variations.[13] On average, the star is radiating around 400[12] times the luminosity of the Sun from its photosphere at an effective temperature of 3,674 K.[12]

  1. ^ Cite error: The named reference HipDataAccess was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Cousins1964 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Sloan1998 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference tycho-gaia was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference tabur2009 was invoked but never defined (see the help page).