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	r1Sgr, rho 1 Sgr, 44 Sgr, HR 7340, HD 181577, SAO 162512, BD -18 5322
constellation	Sagittarius

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

position, motion, parallax:

position (J2000)	RA: 19h 21min 40.4sec	DEC: -17° 50' 50''
position (2000.73)	RA: 19h 21min 43sec	DEC: -17° 50' 45''
position (B1900)	RA: 19h 15min 52.4sec	DEC: -18° 2' 8''
proper motion (J2000)	RA: -0.024 arcsec/a	DEC: 0.024 arcsec/a
radial velocity	1 km/s
rotational velocity	68 km/s (uncertain) (variable)
trigonometric parallax	0.042 arcsec
galactic coordinates	longitude: 20.06°	latitude: -14.55°

magnitude

visual magnitude

3.93 (V on UBV Johnson system)

spectral / color information

spectral class	F0IV-V
B-V-magnitude	0.22
U-B-magnitude	0.13
R-I-magnitude

variability information

variable star identification

Rho1 Sgr

note (category: variability):

Delta Sct 3.90 - 3.93V, 0.050d.

double/multiple star system information

separation	0 arcsec
mag difference (of double or brightest multiple)	2.5
note	doublicity discoverd by occultation

note (category: double and multiple data):

Sep. 0.036". Questionable occultation double.

miscellaneous information

note (category: group membership):

Possible Eggen group with HR 63, q.v.

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

position, motion, parallax:

position (J2000)	RA: 19h 21min 40.345sec	DEC: -17° 50' 50.3''	±0.19 arcsec	source: 16
position (2000.73)	RA: 19h 21min 43sec	DEC: -17° 50' 45''	JD: 2451810.88
proper motion (J2000)	RA: -0.0018 arcsec/a	DEC: 0.018 arcsec/a		source: 25
radial velocity	1 km/s			source: 25
trigonometric parallax	0.042 arcsec		±0.004 arcsec	source: 25
galactic coord. (B1950)	longitude: 20.06°	latitude: -14.55°

magnitude:

visual	3.93 (observed)	source: 25
photovisual	4	source: 2
photographic	4.1	source: 2

spectral information:

spectral class	A5		source: 96
Morgan-Keenan	F0IV-V		source: 25
B-magnitude	4.15 ±0.05	B-V-magnitude	0.22
U-magnitude	4.28 ±0.05	U-B-magnitude	0.13

variability information:

source of data: 30

variability type	10
var. amplitude	0.04
var. period	0.05

double/multiple star system information:

source of data: 25

separation between brightest and second brightest component	0 arcsec
magnitude difference between brightest and second brightest component	2.5

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: 19h 18min 46.401sec	DEC: -17° 56' 34.67''	±0.015 arcsec
position (2000.73)	RA: 19h 21min 43sec	DEC: -17° 50' 46''	JD: 2451810.88
position (J2000)	RA: 19h 21min 40.371sec	DEC: -17° 50' 49.73''
proper motion B1950 (FK4)	RA: -0.0018 arcsec/a	DEC: 0.024 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0017 arcsec/a	DEC: 0.024 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 26694
Durchmusterung	BD-18 5322
Boss General Catalogue	26694
Henry Draper Catalogue	181577

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

position:

position (equinox 1950.0)

RA: 19h 18min 46.4sec

DEC: -17° 56' 35''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	3.9
magnitute at min. brightness	3.94
photometric system	visual, photovisual or Johnson's V
period [d]	0.05

spectral information

spectral class

F0IV-V

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	72/90171
constellation	Sagittarius
notes on existence	The star is equivalent to '0729020 ups'.

variability type description

variability type

description

DSCTC

Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.