About: 21 Cancri

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21 Cancri is a double star in the northern zodiac constellation of Cancer. It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08. The star is located around 791 light years away from the Sun, based on parallax. It is moving further from the Earth with a heliocentric radial velocity of 35 km/s.

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rdfs:label	21 Cancri (en) 21 Cancri (it) 21 Рака (ru) 21 Cancri (sv)
rdfs:comment	21 Cancri è una stella gigante rossa di magnitudine 6,14 situata nella costellazione del Cancro. Dista 1113 anni luce dal sistema solare. (it) 21 Рака (лат. 21 Cancri) — двойная звезда, которая находится в созвездии Рака. Главный компонент, 21 Рака А, — красный гигант спектрального класса М. (ru) 21 Cancri, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna, belägen i den sydöstra delen av stjärnbilden Kräftan. Den har en skenbar magnitud av ca 6,08 och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 4,0 mas, beräknas den befinna sig på ett avstånd på ca 810 ljusår (ca 250 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 35 km/s. (sv) 21 Cancri is a double star in the northern zodiac constellation of Cancer. It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08. The star is located around 791 light years away from the Sun, based on parallax. It is moving further from the Earth with a heliocentric radial velocity of 35 km/s. (en)
dct:subject	Binary stars Bright Star Catalogue objects Cancer (constellation) Durchmusterung objects Flamsteed objects Henry Draper Catalogue objects Hipparcos objects M-type giants Suspected variables
Wikipage page ID	2916640 (xsd:integer)
Wikipage revision ID	1121452771 (xsd:integer)
Link from a Wikipage to another Wikipage	Cancer (constellation) Double star Stellar classification Binary stars Bright Star Catalogue objects Cancer (constellation) Durchmusterung objects Flamsteed objects Henry Draper Catalogue objects Hipparcos objects M-type giants Suspected variables Constellation Photosphere Effective temperature Arc second Light year Stellar evolution Stellar parallax Red giant Asymptotic giant branch Zodiac Apparent visual magnitude Radial velocity Variable star Giant star Radius of the Sun Sun's luminosity
sameAs	21 Cancri 21 Cancri 21 Cancri 21 Cancri 21 Cancri 21 Cancri 21 Cancri
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appmag v	6.080000 (xsd:double)
constell	Cancer (constellation)
epoch	J2000 (en)
luminosity	587 (xsd:integer)
p error	0.027200 (xsd:double)
parallax	4.125800 (xsd:double)
radial v	4.530000 (xsd:double)
radius	53 (xsd:integer)
temperature	3885 (xsd:integer)
has abstract	21 Cancri is a double star in the northern zodiac constellation of Cancer. It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08. The star is located around 791 light years away from the Sun, based on parallax. It is moving further from the Earth with a heliocentric radial velocity of 35 km/s. The brighter component is an aging red giant with a stellar classification of M2III. It is currently on the asymptotic giant branch, indicating this is a highly evolved star that has exhausted both its core hydrogen and core helium. This is a suspected variable star. It has expanded to 53 times the radius of the Sun and is radiating 587 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,885 K. A 9th magnitude companion star is located one arc second away. (en)

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