3 Camelopardalis

3 Camelopardalis

A light curve for 3 Camelopardalis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 04h 39m 54.682s[2]
Declination +53° 04′ 46.33″[2]
Apparent magnitude (V) 5.073[3]
Characteristics
Spectral type K0III[4]
U−B color index 0.89[5]
B−V color index 1.07[5]
Variable type suspected RS CVn[6]
Astrometry
Radial velocity (Rv)−40.50[7] km/s
Proper motion (μ) RA: −5.68±0.66[2] mas/yr
Dec.: −15.00±0.60[2] mas/yr
Parallax (π)7.72 ± 0.70 mas[2]
Distance420 ± 40 ly
(130 ± 10 pc)
Absolute magnitude (MV)−0.82[4]
Orbit[8]
PrimaryAa
CompanionAb
Period (P)121 days
Eccentricity (e)0.02
Semi-amplitude (K1)
(primary)		28.20 km/s
Details
Aa
Mass3.3[9] M☉
Radius24.1[9] R☉
Luminosity259[9] L☉
Surface gravity (log g)2.49[10] cgs
Temperature4,715[9] K
Metallicity−0.21[10]
Rotation121 days[9]
Rotational velocity (v sin i)6.7[4] km/s
Ab
Mass2.37[11] M☉
B
Mass0.65[11] M☉
Other designations
HR 1467, HD 29317, BD+52°865, HIP 21727, SAO 24743, GC 5658, ADS 3359, CCDM 04399+5305
Database references
SIMBADdata
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

3 Camelopardalis is a spectroscopic and visual binary in the constellation Camelopardalis. It is approximately 496 light years from Earth.

3 Camelopardalis is a visual binary with the two components separated by 3.7". The brighter of the pair is also a single-lined spectroscopic binary with an orbital period of 121 days.[11]

The primary component, 3 Camelopardalis Aa, is an orange K-type giant with a mean apparent magnitude of +5.07. It rotates once every 121 days, matching the orbital period with its close companion. It was thought to be a short period Cepheid variable[12] when it was first investigated, but has since been classified as a probable RS Canum Venaticorum variable. The total amplitude of its variations is less than 0.1 magnitudes.[6]

The spectroscopic companion has not been observed directly and its cannot be detected in the spectrum. It is inferred on the basis of radial velocity variations in its brighter companion. Assuming a circular orbit, it has a mass of 2.37 M☉.

The visual companion is a 12th magnitude star.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference eker was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference bs was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference nsv was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference karatas was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference sb9 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference gondoin was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference pastel was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference tokovinin was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference percy was invoked but never defined (see the help page).