R Trianguli

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

position, motion, parallax:

position (J2000)	RA: 2h 37min 2.5sec	DEC: +34° 15' 50''
position (2000.72)	RA: 2h 37min 6sec	DEC: +34° 16' 1''
position (B1900)	RA: 2h 30min 57.7sec	DEC: +33° 49' 53''
proper motion (J2000)	RA: 0.058 arcsec/a	DEC: -0.029 arcsec/a
radial velocity	67 km/s note: variable radial velocity
trigonometric parallax	0.008 arcsec
galactic coordinates	longitude: 146.59°	latitude: -23.71°

magnitude

visual magnitude

5.3
(V on UBV Johnson system)

spectral / color information

spectral class	M4IIIe
B-V-magnitude	1.55
U-B-magnitude	0.84

note (category: colors):

IR source.

variability information

variable star identification

R Tri

note (category: variability):

M 5.4 - 12.6v, 266.43d.

miscellaneous information

note (category: miscellaneous):

Proper motion from AGK3. Earlier McCormick determination, +.022",-.013".

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

position, motion, parallax:

position (J2000)	RA: 2h 37min 2.358sec	DEC: +34° 15' 51.33''	ą0.43 arcsec	source: 16
position (2000.72)	RA: 2h 37min 5sec	DEC: +34° 16' 2''	JD: 2451806.35
proper motion (J2000)	RA: 0.0029 arcsec/a	DEC: -0.011 arcsec/a		source: 25
radial velocity	67 km/s			source: 25
trigonometric parallax	0.008 arcsec		ą0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 146.6°	latitude: -23.71°

magnitude:

visual	5.3 (observed)	source: 25
photographic	9.4	source: 16

spectral information:

spectral class	M9		source: 16
Morgan-Keenan	M4IIIe		source: 25
B-magnitude	6.85 ą0.05	B-V-magnitude	1.55
U-magnitude	7.69 ą0.05	U-B-magnitude	0.84

variability information:

source of data: 30

variability type	180
var. amplitude	7.2
var. period	266.9
var. epoch	2445215 2. September 1982, 12:00:00 UT
next max light	2451887.5 8. December 2000, 00:00:00 UT

sources:

16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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

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

position:

position (equinox 1950.0)

RA: 2h 34min 0sec

DEC: +34° 2' 54''

ą 1 sec / ą 0.1 arcmin

variability informations:

variability type	M	pulsating variable star
magnitute at max. brightness	5.4
magnitute at min. brightness	12.6
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2445215 2. September 1982, 12:00:00 UT
period [d]	266.9
next maximum light [JD]	2451887.5 8. December 2000, 00:00:00 UT
rising time	44 % of period

spectral information

spectral class

M4IIIe-M8e

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	80/1
constellation	Triangulum
notes on existence	The star is equivalent to '0800002 S'.
There are notes in published catalog.

variability type description

variability type

description

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).