Deneb Algedi

The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

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

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

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

note (category: star names): Deneb Algedi; Deneb Algiedi; Scheddi; Sheddi.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 21h 47min 2,4sec DEC: -16 7' 38''
position (J1900) 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


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 0,17
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'' 0,06 arcsec source: 15
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 0,009 arcsec source: 25
galactic coord. (B1950) longitude: 37,61 latitude: -46,01
GCI unit vector (J2000) X: 0,803469 Y: -0,526573 Z: -0,277772


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 0,05 B-V-magnitude 0,29
U-magnitude 3,25 0,05 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 2451621,02
17. March 2000, 12:28:48 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


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 (J1950) RA: 21h 44min 16,992sec DEC: -16 21' 18,42'' 0,004 arcsec
position (J2000) RA: 21h 47min 2,458sec DEC: -16 7' 38,19''
proper motion J1950 (FK4) RA: 0,0182 arcsec/a DEC: -0,294 arcsec/a 0,001 arcsec/a in RA
0,001 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


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.


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
1910 - 118,9''

discoverer information:

discoverer code discoverer reference
HJ 3056 Herschel, J. -


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 (J1950) 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] 2451621,3111992
17. March 2000, 19:28:08 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


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'


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
EA 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.

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.

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.

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.