Ross 548

Ross 548

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cetus
Right ascension	01^h 36^m 13.60^s[1]
Declination	−11° 20′ 32.2″[1]
Apparent magnitude (V)	14.1[1]
Characteristics
Spectral type	DAV4[2]
U−B color index	-0.5[2]
B−V color index	0.2[2]
Variable type	DAV (ZZ Ceti)[2]
Astrometry
Proper motion (μ)	RA: 454[1] mas/yr Dec.: -120[1] mas/yr
Parallax (π)	13 ± 2[3] mas
Distance	approx. 250 ly (approx. 80 pc)
Other designations
ZZ Ceti, ZZ Cet, EGGR 10, G 271-106, G 272-52, LTT 873, NLTT 5358, WD 0133-116

Ross 548 is a variable white dwarf star of the DAV type. It was found to be variable in 1970;^[4] in 1972, it was given the variable star designation ZZ Ceti,^[5] which also refers to the entire class of DAV variable white dwarfs.^{[6], pp. 891, 895.}

References

1. Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog, Samir Salim and Andrew Gould, Astrophysical Journal 582, #2 (January 2003), pp. 1011–1031; CDS ID J/ApJ/582/1011.
2. A Catalog of Spectroscopically Identified White Dwarfs, George P. McCook and Edward M. Sion, Astrophysical Journal Supplement 121, #1 (March 1999), pp. 1–130. CDS ID III/210.
3. Table 1, Summary of U.S. Naval Observatory parallaxes, R. S. Harrington and C. C. Dahn, Astronomical Journal 85 (April 1980), pp. 454–465.
4. High-Frequency Stellar Oscillations. VI. R548, a Periodically Variable White Dwarf, Barry M. Lasker and James E. Hesser, Astrophysical Journal 163 (February 1971), pp. L89–L93.
5. 58th Name-List of Variable Stars, B. V. Kukarkin, P. N. Kholopov, N. P. Kukarkina, N. B. Perova, Information Bulletin on Variable Stars, #717, September 21, 1972.
6. Physics of white dwarf stars, D. Koester and G. Chanmugam, Reports on Progress in Physics 53 (1990), pp. 837–915.

Coordinates: 01^h 36^m 13.60^s, −11° 20′ 32.2″