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	S Eri, 64 Eri, HR 1611, HD 32045, SAO 150064, BD -12 1047
constellation	Eridanus

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

position, motion, parallax:

position (J2000)	RA: 4h 59min 55.8sec	DEC: -12° 32' 15''
position (2000.73)	RA: 4h 59min 58sec	DEC: -12° 32' 11''
position (B1900)	RA: 4h 55min 16.9sec	DEC: -12° 41' 5''
proper motion (J2000)	RA: 0.045 arcsec/a	DEC: -0.091 arcsec/a
radial velocity	-9 km/s note: suspected variable radial velocity
rotational velocity	173 km/s (uncertain) (variable)
trigonometric parallax	0.022 arcsec
galactic coordinates	longitude: 211.94°	latitude: -30.34°

magnitude

visual magnitude

4.79 (V on UBV Johnson system)

spectral / color information

spectral class	F0IV
B-V-magnitude	0.26
U-B-magnitude	0.16
R-I-magnitude

variability information

variable star identification

S Eri

note (category: variability):

RRc 4.77 - 4.80V, 0.273d.

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

position, motion, parallax:

position (J2000)	RA: 4h 59min 55.728sec	DEC: -12° 32' 14.91''	±0.19 arcsec	source: 16
position (2000.73)	RA: 4h 59min 58sec	DEC: -12° 32' 11''	JD: 2451810.88
proper motion (J2000)	RA: 0.0025 arcsec/a	DEC: -0.084 arcsec/a		source: 25
radial velocity	-9 km/s			source: 25
trigonometric parallax	0.022 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 211.94°	latitude: -30.34°

magnitude:

visual	4.79 (observed)	source: 25
photovisual	4.2	source: 16
photographic	5.1	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	F0IV		source: 25
B-magnitude	5.05 ±0.05	B-V-magnitude	0.26
U-magnitude	5.21 ±0.05	U-B-magnitude	0.16

variability information:

source of data: 30

variability type	122
var. amplitude	0.03
var. period	0.27

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
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
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: 4h 57min 36.24sec	DEC: -12° 36' 35.31''	±0.022 arcsec
position (2000.73)	RA: 4h 59min 57sec	DEC: -12° 32' 7''	JD: 2451810.88
position (J2000)	RA: 4h 59min 55.764sec	DEC: -12° 32' 15.14''
proper motion B1950 (FK4)	RA: 0.0026 arcsec/a	DEC: -0.091 arcsec/a	±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.003 arcsec/a	DEC: -0.091 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	F0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 6104
Durchmusterung	BD-12 1047
Boss General Catalogue	6104
Henry Draper Catalogue	32045

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

position:

position (equinox 1950.0)

RA: 4h 57min 36.2sec

DEC: -12° 36' 35''

variability informations:

variability type	RRC:	pulsating variable star
magnitute at max. brightness	4.77
magnitute at min. brightness	4.8
photometric system	visual, photovisual or Johnson's V
period [d]	0.273

spectral information

spectral class

F0IV

references

to a study	Vol. II GCVS
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	36/2
constellation	Eridanus
notes on existence	The star is equivalent to '0360003 T'.

variability type description

variability type

description

RRC

Variables of the RR Lyrae type, which are radially-pulsating giant A-F stars having amplitudes from 0.2 to 2 mag in V. Cases of variable light-curve shapes as well as variable periods are known. If these changes are periodic, they are called the "Blazhko effect." Traditionally, RR Lyrae stars are sometimes called short-period Cepheids or cluster-type variables. The majority of these stars belong to the spherical component of the Galaxy; they are present, sometimes in large numbers, in some globular clusters, where they are known as pulsating horizontal-branch stars. Like Cepheids, maximum expansion velocities of surface layers for these stars practically coincide with maximum light. RR(B) RR Lyrae variables showing two simultaneously operating pulsation modes, the fundamental tone with the period P0 and the first overtone, P1 (AQ Leo). The ratio P1/P0 is approximately 0.745; RRAB RR Lyrae variables with asymmetric light curves (steep ascending branches), periods from 0.3 to 1.2 days, and amplitudes from 0.5 to 2 mag in V; RRC RR Lyrae variables with nearly symmetric, sometimes sinusoidal, light curves, periods from 0.2 to 0.5 days, and amplitudes not greater than 0.8 mag in V (SX UMa).