23 Comae Berenices

Last updated
23 Comae Berenices
Observation data
Epoch J2000       Equinox J2000
Constellation Coma Berenices
Right ascension 12h 34m 51.08058s [1]
Declination +22° 37 45.3303 [1]
Apparent magnitude  (V)4.80 [2] (4.96 + 6.90) [3]
Characteristics
Spectral type A0IV [4]
U−B color index −0.01 [5]
B−V color index +0.012±0.015 [2]
Astrometry
Radial velocity (Rv)−16.0±1.8 [6] km/s
Proper motion (μ)RA: −58.89 [1] mas/yr
Dec.: 28.31 [1] mas/yr
Parallax (π)10.52±0.52  mas [1]
Distance 310 ± 20  ly
(95 ± 5  pc)
Absolute magnitude  (MV)−0.08 [2]
Orbit [7]
Period (P)33.04 yr
Semi-major axis (a)0.219″
Eccentricity (e)0.898
Inclination (i)109.7°
Longitude of the node (Ω)24.3°
Periastron epoch (T) B1964.62
Argument of periastron (ω)
(secondary)
214.5°
Details
Mass 2.15 [8]   M
Radius 3.0 [9]   R
Luminosity 104.00 [2]   L
Surface gravity (log g)3.85 [8]   cgs
Temperature 9,675±329 [8]   K
Rotational velocity (v sin i)40 [8]  km/s
Age 210 [8]   Myr
Other designations
23 Com, BD+23°2475, FK5  1323, GC  17142, HD  109485, HIP  61394, HR  4789, SAO  82390, WDS  J12349+2238 [10]
Database references
SIMBAD data

23 Comae Berenices, also named Phyllon Kissinou, [11] is a binary star [7] system in the northern constellation of Coma Berenices, situated a few degrees away from the North Galactic Pole. [12] It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.80. [2] The system is located around 310  light years away from the Sun, based on parallax. [1] It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s. [6]

The components of this system orbit each other with a period of 33 years, a large eccentricity of 0.9, and an angular semimajor axis of 0.219 . [7] The primary, designated component A, is a magnitude 4.96 [3] star with a stellar classification of A0IV, [4] matching an A-type subgiant that has exhausted the supply of hydrogen at its core and is in the process of evolving into a giant. Bychkov et al. (2009) list it as an Am star with an average field strength of 26×10−4  T . [13]

The primary is 210 [8]  million years old and is spinning with a projected rotational velocity of 40 km/s. [8] It has 2.15 [8] times the mass of the Sun and about three [9] times the Sun's radius. The star is radiating 104 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 9,675 K. [8]

In Ptolemy's Almagest , this star is named Phyllon Kissinou (φύλλοv κισσίνου), meaning an ivy leaf. [11] It is also known by the shorter name Kissin (or Kissīn); this name has also been used for 21 Comae Berenices. [14] The IAU Working Group on Star Names approved the name Phyllon Kissinou for this star on 16 May 2024 and it is now so entered in the IAU Catalog of Star Names. [11]

References