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18 Monocerotis è una stella gigante arancione di magnitudine 4,48 situata nella costellazione dell'Unicorno. Dista 373 anni luce dal sistema solare.
, 阙丘一（麒麟座18），又名BD+02 1397，HD 49293、SAO 114428、HR 2506，是麒麟座的一颗恒星，视星等为4.47，位于銀經210.38，銀緯0.3，其B1900.0坐标为赤經6h 42m 38.7s，赤緯+2° 0.3′ 18″。
, 18 Monocerotis is a binary star system loc … 18 Monocerotis is a binary star system located about half way from Orion's Belt to Procyon, in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.47, and is positioned around 370 light years away from the Sun based on parallax. The system is receding from the Earth with a heliocentric radial velocity of +11 km/s. It is reported as a single-lined spectroscopic binary with an orbital period of 1,760.9 days (4.8 years) and an eccentricity of 0.4. The visible component is an aging K-type giant star with a stellar classification of K0+IIIaBa0.2, showing a slight overabundance of barium. The spectrum displays strong violet lines of CN. With the supply of hydrogen at its core exhausted, this star has expanded to 27 times the radius of the Sun. It is radiating 311 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,750 K.re at an effective temperature of 4,750 K.
, 18 Monocerotis, som är stjärnans Flamsteed … 18 Monocerotis, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Enhörningen, ungefär mitt emellan Orions bälte och Procyon. Den har en kombinerad skenbar magnitud på ca 4,47 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 8,1 mas, beräknas den befinna sig på ett avstånd på ca 400 ljusår (ca 124 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 11 km/s.liocentrisk radialhastighet av ca 11 km/s.
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| rdfs:comment |
阙丘一（麒麟座18），又名BD+02 1397，HD 49293、SAO 114428、HR 2506，是麒麟座的一颗恒星，视星等为4.47，位于銀經210.38，銀緯0.3，其B1900.0坐标为赤經6h 42m 38.7s，赤緯+2° 0.3′ 18″。
, 18 Monocerotis, som är stjärnans Flamsteed … 18 Monocerotis, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Enhörningen, ungefär mitt emellan Orions bälte och Procyon. Den har en kombinerad skenbar magnitud på ca 4,47 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 8,1 mas, beräknas den befinna sig på ett avstånd på ca 400 ljusår (ca 124 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 11 km/s.liocentrisk radialhastighet av ca 11 km/s.
, 18 Monocerotis è una stella gigante arancione di magnitudine 4,48 situata nella costellazione dell'Unicorno. Dista 373 anni luce dal sistema solare.
, 18 Monocerotis is a binary star system loc … 18 Monocerotis is a binary star system located about half way from Orion's Belt to Procyon, in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.47, and is positioned around 370 light years away from the Sun based on parallax. The system is receding from the Earth with a heliocentric radial velocity of +11 km/s. heliocentric radial velocity of +11 km/s.
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18 Monocerotis
, 阙丘一
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