Deneb Algedi

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

note (category: star names):

Deneb Algedi; Deneb Algiedi; Scheddi; Sheddi.

position, motion, parallax:

position (J2000)	RA: 21h 47min 2.4sec	DEC: -16° 7' 38''
position (2000.73)	RA: 21h 47min 4sec	DEC: -16° 7' 26''
position (B1900)	RA: 21h 41min 31.3sec	DEC: -16° 34' 52''
proper motion (J2000)	RA: 0.263 arcsec/a	DEC: -0.297 arcsec/a
radial velocity	-6 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	87 km/s (uncertain) (variable)
trigonometric parallax	0.087 arcsec
galactic coordinates	longitude: 37.6°	latitude: -46.01°

magnitude

visual magnitude

2.87
(V on UBV Johnson system)

spectral / color information

spectral class	Am
B-V-magnitude	0.29
U-B-magnitude	0.09
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Delta Sct spectrum. Also classified Delta Del, A7mIII.

variability information

variable star identification

Del Cap

note (category: variability):

EA (possibly RS CVn type) 2.83 - 3.05V, 1.0227789d. Form of light curve varies.

double/multiple star system information

number of components of multiple star system	4
separation	0 arcsec
mag difference (of double or brightest multiple)	2

note (category: double and multiple data):

ADS 15314A. Component A is SB, 3.2, 5.2v, 0.0018"; B, 15.8v, 69"; C 12.7v, 120".

note (category: spectroscopic binaries):

1.0228d, K 70.8k/s, V0 -0.2k/s, asini 0.996.

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

position, motion, parallax:

position (J2000)	RA: 21h 47min 2.448sec	DEC: -16° 7' 38.27''	ą0.06 arcsec	source: 15
position (2000.73)	RA: 21h 47min 4sec	DEC: -16° 7' 26''	JD: 2451810.11
proper motion (J2000)	RA: 0.0183 arcsec/a	DEC: -0.297 arcsec/a		source: 25
radial velocity	-6 km/s			source: 25
trigonometric parallax	0.087 arcsec		ą0.009 arcsec	source: 25
galactic coord. (B1950)	longitude: 37.61°	latitude: -46.01°

magnitude:

visual	2.81 (observed)	source: 30
photovisual	3	source: 2
photographic	3.1	source: 2

spectral information:

spectral class	A5		source: 96
B-magnitude	3.16 ą0.05	B-V-magnitude	0.29
U-magnitude	3.25 ą0.05	U-B-magnitude	0.09

variability information:

source of data: 30

variability type	310
var. amplitude	0.24
var. period	1.02
var. epoch	2435657 2. July 1956, 12:00:00 UT
next max light	2451810.74 23. September 2000, 05:45:36 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	69.1 arcsec
magnitude difference between brightest and second brightest component	12.9
position angle	94 °

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
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: 21h 44min 16.992sec	DEC: -16° 21' 18.42''	ą0.004 arcsec
position (2000.73)	RA: 21h 47min 4sec	DEC: -16° 7' 11''	JD: 2451810.11
position (J2000)	RA: 21h 47min 2.458sec	DEC: -16° 7' 38.19''
proper motion B1950 (FK4)	RA: 0.0182 arcsec/a	DEC: -0.294 arcsec/a	ą0.001 arcsec/a in RA ą0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0184 arcsec/a	DEC: -0.296 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

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

spectral information:

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

catalogues

source catalogue	FK4, catalogue number: 819
Durchmusterung	BD-16 5943
Boss General Catalogue	30491
Henry Draper Catalogue	207098

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

position and proper motion:

position (J2000)	RA: 21h 47min	DEC: -16° 8'
proper motion (J2000)	RA: 0.263 arcsec/a	DEC: -0.297 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
AB	1901	1	94°	69.1''	2.87	15.8	Amv	HJ 3056
AC	1901	2	302°	115.2''	2.87	12.7	-	HJ 3056
AC	1910	2	-	118.9''	2.87	12.7	-	HJ 3056

discoverer information:

discoverer code	discoverer	reference
HJ 3056	Herschel, J.	-

notes:

note	Delta Cap. A is an Algol-type eclipsing binary, and also an occultation double.

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

position:

position (equinox 1950.0)

RA: 21h 44min 17sec

DEC: -16° 21' 18''

variability informations:

variability type	EA	close binary eclipsing system
magnitute at max. brightness	2.81
magnitute at min. brightness	3.05
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2435656.913 2. July 1956, 09:54:43 UT
period [d]	1.0227688
next maximum light [JD]	2451810.5234272 23. September 2000, 00:33:44 UT
duration of the eclipse	08 % of period the duration of the light constancy phase at minimum light is equal to zero

spectral information

spectral class

A7mIII

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	16/9004
constellation	Capricornus
notes on existence	The star is equivalent to '0169005 eps'.
There are notes in published catalog.

variability type description

variability type

description

Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other.
Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion.

EA
Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes.

EB
Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components
generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V.

EW
W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.

catalogues and names	Deneb Algedi, d Cap, del Cap, 49 Cap, HR 8322, HD 207098, SAO 164644, BD -16 5943, FK5: 819, WDS 21470-1608A
other names	Deneb Algiedi, Scheddi, Sheddi
constellation	Capricornus