Acamar

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

note (category: star names):

ACAMAR.

position, motion, parallax:

position (J2000)	RA: 2h 58min 15,7sec	DEC: -40° 18' 17''
position (2001,18)	RA: 2h 58min 19sec	DEC: -40° 18' 0''
position (B1900)	RA: 2h 54min 28,1sec	DEC: -40° 42' 19''
proper motion (J2000)	RA: -0,045 arcsec/a	DEC: 0,019 arcsec/a
radial velocity	12 km/s note: spectroscopic binaries, double lined spectra
rotational velocity	74 km/s (uncertain) (variable)
trigonometric parallax	0,035 arcsec
galactic coordinates	longitude: 247,86°	latitude: -60,74°

note (category: dynamical parallaxes):

0.016".

magnitude

visual magnitude

3,24
(V on UBV Johnson system)

spectral / color information

spectral class	A4III
B-V-magnitude	0,14
U-B-magnitude	0,14
R-I-magnitude

variability information

variable star identification

1002

double/multiple star system information

separation	8,3 arcsec
mag difference (of double or brightest multiple)	1,1
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Binary with HR 898. Uncertain which component var. Combined mag. HR 897/8, 2.91V; combined colors, +0.125(B-V), +0.13(U-B).

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

position, motion, parallax:

position (J2000)	RA: 2h 58min 15,696sec	DEC: -40° 18' 16,97''	ą0,06 arcsec	source: 15
position (2001,18)	RA: 2h 58min 19sec	DEC: -40° 18' 0''	JD: 2451976,79
proper motion (J2000)	RA: -0,0039 arcsec/a	DEC: 0,019 arcsec/a		source: 25
radial velocity	12 km/s			source: 25
trigonometric parallax	0,035 arcsec		ą0,003 arcsec	source: 25
galactic coord. (B1950)	longitude: 247,85°	latitude: -60,74°

magnitude:

visual	3,24 (observed)	source: 25
photovisual	3,4	source: 2
photographic	3,5	source: 2

spectral information:

spectral class	A2		source: 29
Morgan-Keenan	A5IV		source: 25
B-magnitude	3,38 ą0,05	B-V-magnitude	0,14
U-magnitude	3,52 ą0,05	U-B-magnitude	0,14

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	8,3 arcsec
magnitude difference between brightest and second brightest component	1,1
position angle	91 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	3,24	A2	Acamar, q¹Eridani, HR 897, HD 18622, SAO 216113
B	4,35	A2	q²Eridani, HR 898, HD 18623, SAO 216114

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
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
29	SAOJ2000
SAO on FK5 at J2000, 1989

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

position and proper motion:

position (B1950)	RA: 2h 56min 21,882sec	DEC: -40° 30' 15,15''	ą0,01 arcsec
position (2001,18)	RA: 2h 58min 19sec	DEC: -40° 18' 1''	JD: 2451976,79
position (J2000)	RA: 2h 58min 15,691sec	DEC: -40° 18' 16,98''
proper motion B1950 (FK4)	RA: -0,0045 arcsec/a	DEC: 0,023 arcsec/a	ą0,002 arcsec/a in RA ą0,002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0,0039 arcsec/a	DEC: 0,019 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3,4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 106
Durchmusterung	CD-40 771A
Boss General Catalogue	3584
Henry Draper Catalogue	18622

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 2h 58,3min	DEC: -40° 18'
proper motion (J2000)	RA: -0,045 arcsec/a	DEC: 0,019 arcsec/a

double/multiple star system information:

component	year	number of measures	position angle	angular separation	magnitude of 1st component	magnitude of 2nd component	spectral class(es)	discoverer code
-	1835	54	82°	8,3''	3,4	4,5	A4III A1V	PZ 2
-	1990	54	91°	-	3,4	4,5	A4III A1V	PZ 2

discoverer information:

discoverer code	discoverer	reference
PZ 2	Piazzi, G.	-

notes:

note	Theta Eri. A is a spectroscopic binary. Proper motion of B -017 -006.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 2h 56min 22,6sec

DEC: -40° 30' 14''

variability informations:

variability type	-
magnitute at max. brightness	2,91
magnitute at min. brightness
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

0807D (designation: 48,49GERI)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).

catalogues and names	Acamar, q¹Eri, NSV 01002, HR 897, HD 18622, SAO 216113, CD -40 771 A, FK5: 106, WDS 02583-4018A
constellation	Eridanus