catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

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

catalogues and names

catalogues and names

U Ori, HR 2063, HD 39816, SAO 77730, BD +20 1171 a

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

position, motion, parallax:

position (J2000)	RA: 5h 55min 49.3sec	DEC: +20° 10' 30''
position (2000.72)	RA: 5h 55min 52sec	DEC: +20° 10' 30''
position (B1900)	RA: 5h 49min 52.8sec	DEC: +20° 9' 29''
proper motion (J2000)	RA: 0 arcsec/a	DEC: -0.014 arcsec/a
radial velocity	-21 km/s note: suspected variable radial velocity
galactic coordinates	longitude: 188.72°	latitude: -2.49°

magnitude

visual magnitude

5.4 (V on UBV Johnson system)

spectral / color information

spectral class	M6.5IIIe
B-V-magnitude	0.99
U-B-magnitude	0.43
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Infrared star. OH and water emission. SiO maser source. OH emission strong in infrared. Also H2O microwave emission. IR spectra show water vapor. Strong water bands at light minimum.

variability information

variable star identification

U Ori

note (category: variability):

M 4.8 - 12.6v, 368.3d. Period has varied between 367.9 and 376.0d. Colors correspond to 6.72V.

miscellaneous information

note (category: polarization):

Polarization possibly due to circumstellar dust scattering.

note (category: stellar radii or diameters):

Occultation diam. = 0.0143 - 0.01545".

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

position, motion, parallax:

position (J2000)	RA: 5h 55min 49.166sec	DEC: +20° 10' 30.93''	±0.2 arcsec	source: 52
position (2000.72)	RA: 5h 55min 52sec	DEC: +20° 10' 31''	JD: 2451806.35
proper motion (J2000)	RA: -0.0012 arcsec/a	DEC: -0.005 arcsec/a		source: 25
radial velocity	-21 km/s			source: 25
galactic coord. (B1950)	longitude: 188.72°	latitude: -2.49°

magnitude:

visual	5.4 (observed)	source: 25
photographic	8.6	source: 16

spectral information:

spectral class	M7		source: 96
Morgan-Keenan	M6.5IIIe		source: 25
B-magnitude	6.39 ±0.05	B-V-magnitude	0.99
U-magnitude	6.82 ±0.05	U-B-magnitude	0.43

variability information:

source of data: 30

variability type	180
var. amplitude	8.2
var. period	368.3
var. epoch	2445254 11. October 1982, 12:00:00 UT
next max light	2451883.4 4. December 2000, 21:36:00 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
52	PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 5h 52min 51.005sec	DEC: +20° 10' 6.19''	±0.058 arcsec
position (2000.72)	RA: 5h 55min 52sec	DEC: +20° 10' 31''	JD: 2451806.35
position (J2000)	RA: 5h 55min 49.282sec	DEC: +20° 10' 30.27''
proper motion B1950 (FK4)	RA: 0.0001 arcsec/a	DEC: -0.015 arcsec/a	±0.011 arcsec/a in RA ±0.011 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0 arcsec/a	DEC: -0.014 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.4 (accuracy: 1 decimal)
source of visual magnitude data	Source cited in source catalog introduction.

spectral information:

spectral class	M7e
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	GC, catalogue number: 7457
Durchmusterung	BD+20 1171 a
Boss General Catalogue	7457
Henry Draper Catalogue	39816

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

position:

position (equinox 1950.0)

RA: 5h 52min 51sec

DEC: +20° 10' 6''

variability informations:

variability type	M	pulsating variable star
magnitute at max. brightness	4.8
magnitute at min. brightness	13
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2445254 11. October 1982, 12:00:00 UT
period [d]	368.3
next maximum light [JD]	2451883.4 4. December 2000, 21:36:00 UT
rising time	38 % of period

spectral information

spectral class

M6e-M9.5e

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	60/4
constellation	Orion
notes on existence	The star is equivalent to '0600005 V'.
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).