49 Ceti

49 Ceti is a single^[10] star in the equatorial constellation of Cetus. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.607.^[3] The star is located 187 light-years (57 parsecs) away from the Solar System, based on its parallax,^[2] and is drifting further away with a radial velocity of +10 km/s.^[7] 49 Ceti has been identified as a member of the 40-million-year-old Argus Association.^[9]

49 Ceti

Location of 49 Ceti (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Cetus[1]
Right ascension	01h 34m 37.77868s[2]
Declination	−15° 40′ 34.8987″[2]
Apparent magnitude (V)	5.607[3]
Characteristics
Evolutionary stage	main sequence[4]
Spectral type	A1V[5]
U−B color index	+0.05[6]
B−V color index	+0.07[6]
Astrometry
Radial velocity (Rv)	+10.30±0.7[7] km/s
Proper motion (μ)	RA: +94.351 mas/yr[2] Dec.: −3.130 mas/yr[2]
Parallax (π)	17.4725±0.547 mas[2]
Distance	187 ± 6 ly (57 ± 2 pc)
Absolute magnitude (MV)	+1.75[1]
Details
Mass	1.96±0.04[2] M☉
Radius	1.711±0.007[2] R☉
Luminosity	19.12[4] L☉
Surface gravity (log g)	4.30±0.15[8] cgs
Temperature	8,970±100[8] K
Metallicity [Fe/H]	0.10[4] dex
Rotational velocity (v sin i)	196.9±2.1[8] km/s
Age	40[9] Myr
Other designations
BD−16°265, HD 9672, HIP 7345, HR 451, SAO 147886
Database references
SIMBAD	data

This is a young A-type main-sequence star with a stellar classification of A1V.^[5] It is about 40 million years old^[9] with a high rate of spin, showing a projected rotational velocity of 196 km/s.^[8] The star has 1.96 times the mass of the Sun and 1.71 times the radius of the Sun.^[2] It is radiating 19 times the Sun's luminosity from its photosphere at an effective temperature of 8,790 K.^[4][8]

49 Ceti displays a significant infrared excess, which is a characteristic of a debris disk orbiting the star. Unusually, the disk seems to be gas-rich, with evidence of carbon monoxide (CO) gas. This carbon monoxide gas may possibly be from comets orbiting the star within the disk, similar to the Kuiper Belt in the Solar System.^[9]