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- Theta_Eridani abstract "Theta Eridani (θ Eri, θ Eridani) is a star in the constellation Eridanus. It has the traditional name Acamar from the Arabic آخِر النَّهْر[citation needed] Ākhir an-nahr which means "the end of the river". Historically, Acamar represented the end of the constellation Eridanus. Now that distinction is held by the star Achernar, a star which shares the same Arabic etymology. Achernar is not visible from the Greek isles (latitudes > 33° North), hence the choice of Acamar as the river's end during the time of Hipparchus and later Ptolemy. The term Ākhir an-nahr or Achr al Nahr was appeared in the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, which was translated into Latin as Postrema Fluminis.In Chinese, 天園 (Tiān Yuán), meaning Celestial Orchard, refers to an asterism consisting of θ Eridani, χ Eridani, φ Eridani, κ Eridani, HD 16754, HD 23319, HD 24072, HD 24160, υ4 Eridani, 43 Eridani, υ2 Eridani and υ1 Eridani. Consequently, θ Eridani itself is known as 天園六 (Tiān Yuán liù, English: the Sixth Star of Celestial Orchard.)Acamar is a double star with some evidence suggesting it is part of a multiple star system. The main star, θ1 Eri, is of the spectral class A4 and has a +3.2 apparent magnitude. Its companion star, θ2 Eri, is of the spectral class A1 and has an apparent magnitude of +4.3. The angular separation of the two stars is equal to 8.3 arcseconds. Acamar's distance from Earth as measured by the Hipparcos astrometry satellite is approximately 120 light-years.Ptolemy described Acamar as a first-magnitude star, which some have taken to be in fact Achernar, which today appears just above the horizon in Alexandria where Ptolemy lived.Achernar, however, was not visible to Ptolemy (it is from Alexandria today due to precession); its declination in 100CE was -67, making it invisible even at Aswan. Ptolemy's Eridanus thus without doubt ended at Acamar, which rose about 10 degrees above the horizon from Alexandria. This fact besides positively identifying Acamar as the original "end of the river", also strengthens the case for Acamar having been first magnitude in ancient times.".
- Theta_Eridani thumbnail Eridanus_constellation_map.png?width=300.
- Theta_Eridani wikiPageExternalLink acamar.html.
- Theta_Eridani wikiPageID "2101794".
- Theta_Eridani wikiPageRevisionID "606541276".
- Theta_Eridani absmagV "0.44".
- Theta_Eridani appmagV "3.2".
- Theta_Eridani bV "0.14".
- Theta_Eridani class "A3IV-V".
- Theta_Eridani component "θ1 Eri".
- Theta_Eridani component "θ2 Eri".
- Theta_Eridani constell Eridanus_(constellation).
- Theta_Eridani epoch "J2000".
- Theta_Eridani hasPhotoCollection Theta_Eridani.
- Theta_Eridani luminosity "36".
- Theta_Eridani luminosity "96".
- Theta_Eridani mass "2.4".
- Theta_Eridani mass "2.6".
- Theta_Eridani pError "0.55".
- Theta_Eridani parallax "20.23".
- Theta_Eridani propMoDec "+21.98".
- Theta_Eridani propMoRa "−52.89".
- Theta_Eridani radialV "11.9".
- Theta_Eridani radius "16".
- Theta_Eridani rotation "4.91616E7".
- Theta_Eridani rotationalVelocity "70".
- Theta_Eridani rotationalVelocity "90".
- Theta_Eridani temperature "8200".
- Theta_Eridani temperature "9200".
- Theta_Eridani uB "0.14".
- Theta_Eridani variable "suspected".
- Theta_Eridani subject Category:Bayer_objects.
- Theta_Eridani subject Category:Eridanus_(constellation).
- Theta_Eridani subject Category:Objects_within_1000_ly_of_Earth.
- Theta_Eridani subject Category:Stars_with_proper_names.
- Theta_Eridani type BayerObjects.
- Theta_Eridani type CelestialBody109239740.
- Theta_Eridani type NaturalObject100019128.
- Theta_Eridani type Object100002684.
- Theta_Eridani type PhysicalEntity100001930.
- Theta_Eridani type Star109444100.
- Theta_Eridani type StarsWithProperNames.
- Theta_Eridani type Whole100003553.
- Theta_Eridani type CelestialBody.
- Theta_Eridani type Star.
- Theta_Eridani type PhysicalBody.
- Theta_Eridani comment "Theta Eridani (θ Eri, θ Eridani) is a star in the constellation Eridanus. It has the traditional name Acamar from the Arabic آخِر النَّهْر[citation needed] Ākhir an-nahr which means "the end of the river". Historically, Acamar represented the end of the constellation Eridanus. Now that distinction is held by the star Achernar, a star which shares the same Arabic etymology.".
- Theta_Eridani label "Acamar".
- Theta_Eridani label "Acamar".
- Theta_Eridani label "Acamar".
- Theta_Eridani label "Theta Eridani".
- Theta_Eridani label "Theta Eridani".
- Theta_Eridani label "Theta Eridani".
- Theta_Eridani label "Theta2 Eridani".
- Theta_Eridani label "Акамар".
- Theta_Eridani label "آخر النهر (نجم)".
- Theta_Eridani label "エリダヌス座シータ星".
- Theta_Eridani label "天园六".
- Theta_Eridani sameAs Acamar.
- Theta_Eridani sameAs Acamar.
- Theta_Eridani sameAs Ακαμάρ.
- Theta_Eridani sameAs Theta_Eridani.
- Theta_Eridani sameAs Theta_Eridani.
- Theta_Eridani sameAs Theta_Eridani.
- Theta_Eridani sameAs Acamar.
- Theta_Eridani sameAs エリダヌス座シータ星.
- Theta_Eridani sameAs 아카마.
- Theta_Eridani sameAs Acamar.
- Theta_Eridani sameAs Theta2_Eridani.
- Theta_Eridani sameAs m.06m7dm.
- Theta_Eridani sameAs Q337652.
- Theta_Eridani sameAs Q337652.
- Theta_Eridani sameAs Theta_Eridani.
- Theta_Eridani wasDerivedFrom Theta_Eridani?oldid=606541276.
- Theta_Eridani depiction Eridanus_constellation_map.png.
- Theta_Eridani isPrimaryTopicOf Theta_Eridani.
- Theta_Eridani name "Acamar, θ Eri".