catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names

R Hor, HR 868, HD 18242

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 2h 53min 52.9sec	DEC: -49° 53' 25''
position (2000.72)	RA: 2h 53min 54sec	DEC: -49° 53' 15''
position (B1900)	RA: 2h 50min 33.2sec	DEC: -50° 17' 52''
proper motion (J2000)	RA: 0.135 arcsec/a	DEC: 0.014 arcsec/a
radial velocity	60 km/s note: variable radial velocity
trigonometric parallax	0.013 arcsec
galactic coordinates	longitude: 265.46°	latitude: -57.38°

magnitude

visual magnitude

4 (original HR magnitude)

spectral / color information

spectral class	M7IIIe
B-V-magnitude	2.11
U-B-magnitude	0.43
R-I-magnitude

note (category: spectra):

OH emission strong in infrared. SiO maser. Also classified M5e-M8eII-III.

note (category: colors):

Colors correspond to 10.96V.

variability information

variable star identification

R Hor

note (category: variability):

M 4.7 - 14.3v, 401.5d, JD2412800-28900; later 407.6d.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 2h 53min 52.818sec	DEC: -49° 53' 23.34''	±0.55 arcsec	source: 33
position (2000.72)	RA: 2h 53min 54sec	DEC: -49° 53' 13''	JD: 2451806.35
proper motion (J2000)	RA: 0.0141 arcsec/a	DEC: 0.013 arcsec/a		source: 33
radial velocity	60 km/s			source: 25
trigonometric parallax	0.013 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 265.45°	latitude: -57.38°

magnitude:

visual	4.7 (observed)	source: 25
photovisual	4.7	source: 30

spectral information:

spectral class	M7e		source: 10
Morgan-Keenan	M7IIIe		source: 25
B-magnitude	6.8 ±0.05	B-V-magnitude	2.11
U-magnitude	7.2 ±0.05	U-B-magnitude	0.43

variability information:

source of data: 30

variability type	180
var. amplitude	9.6
var. period	407.6
var. epoch	2441494 25. June 1972, 12:00:00 UT
next max light	2452091.6 1. July 2001, 02:24:00 UT

sources:

10	Michigan Catalog of 2-Dimensional Spectral Types for the HD Stars, Volumes I-III
Houk, N., and A.P. Cowley, Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 1., (Zones -89 to -53 Degrees), Ann Arbor: The University of Michigan, 1975, and Houk, N., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 2., (Zones -52 to -40 Degrees), Ann Arbor: The University of Michigan, 1978, and Houk, N., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 3., (Zones -40 to -26 Degrees), Ann Arbor: The University of Michigan, 1982
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
33	Hipparcos Main Input Catalogue Version 2
Turon, C., et al., The Hipparcos Input Catalogue, Version 2, CDS Bull. No. 43, p.5, 1993

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 2h 52min 12sec

DEC: -50° 5' 42''

± 1 sec / ± 0.1 arcmin

variability informations:

variability type	M	pulsating variable star
magnitute at max. brightness	4.7
magnitute at min. brightness	14.3
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2441494 25. June 1972, 12:00:00 UT
period [d]	407.6
next maximum light [JD]	2452091.6 1. July 2001, 02:24:00 UT
rising time	40 % of period

spectral information

spectral class

M5e-M8eII-III

references

to a study	the main characteristics of the star was determined by the authors themselves
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	41/1
constellation	Horologium
notes on existence	The star is equivalent to '0410002 S'.
There are notes in published catalog.

variability type description

variability type

description

M

Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR).