Acamar

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Double star
Acamar / θ Eridani
Observation
dates equinoxJ2000.0 , epoch : J2000.0
AladinLite
Constellation Eridanus
Right ascension 02 h 58 m 15.679 s
declination -40 ° 18 ′ 16.846 ″
Apparent brightness  2.90 likes
Astrometry
Radial velocity (11.9 ± 2.6) km / s
parallax (19.56 ± 0.35) mas
distance  (167 ± 3) ly
(51 pc )
Individual data
Names A / θ 1 ; B / θ 2
Observation data:
Apparent brightness A / θ 1 3.18 ± 0.01 mag
B / θ 2 4.11 ± 0.01 mag
Typing:
Spectral class A / θ 1 A3 IV-V
B / θ 2 A1 V
B − V color index A / θ 1 (0.15)
B / θ 2 (0.09)
Physical Properties:
Dimensions A / θ 1 (2.6) M
B / θ 2 (2.4) M
Luminosity A / θ 1 (96) L
B / θ 2 (36) L
Effective temperature A / θ 1 (8200) K
B / θ 2 (9200) K
Other names
and catalog entries
Bayer name θ Eridani
Cordoba Survey CD -40 ° 771
Hipparcos catalog HIP 13847 [1]
Bright Star Catalog HR 897 HR 898
Henry Draper Catalog HD 18622 HD 18623
SAO catalog SAO 216113 SAO 216114
Tycho catalog TYC 7563-1016-1 [2] TYC 7563-1017-1 [3]
WDS catalog WDS J02583-4018

Acamar (also Akamar) is the name of the star θ Eridani (Theta Eridani) in the constellation Eridanus . The name is derived from Arabic آخر النهر, DMG Āḫir an-nahr  'end of the river'.

Acamar is a double star , consisting of a +3.2  mag bright main star of the spectral class A3 and a companion of the spectral class A1 with the brightness +4.1 mag. The angular distance between the two stars is 8.2 " , with the companion assuming a position angle of 90 degrees with respect to the main star.
Acamar is about 160  light years (50  parsec ) away

To resolve the system into single stars, you need a telescope with an opening of at least 5 centimeters.

Mention in science fiction

In Star Trek , a planet called Acamar III occurs, which is inhabited by the Acamarianern.

See also: List of Stars

Individual evidence

  1. a b c d e f tet Eri. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed August 19, 2018 .
  2. a b c Jim Kaler: ACAMAR. Retrieved August 19, 2018 .
  3. Paul Kunitzsch: Arabic star names in Europe . Wiesbaden 1959, p. 99 ( limited preview in Google Book search).