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30 Piscium (HIP 154) is a solitary variabl … 30 Piscium (HIP 154) is a solitary variable star in the zodiac constellation of Pisces. It is visible to the naked eye with an apparent visual magnitude of 4.37. Its calculated mid-value of antiposed parallax shift as the earth moves around the sun of very roughly 7.8859 mas, makes it around 410 light years away. Its net movement in the present epoch is one of moving closer – radial velocity (speed away from our star system) is −12 km/s. This is an aging red giant star with a stellar classification of M3 III, indicating it has exhausted the hydrogen at its core and evolved off the main sequence. It is a candidate long-period variable star and has been given the designation YY Psc. It varies in brightness between magnitudes 4.31 and 4.41 with no clear period. Possible periods of 23.1, 32.0, 53.6, and 167.8 days have been identified. The star has 74 times the Sun's radius and is radiating 1,148.5 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,647 K.re at an effective temperature of 3,647 K.
, 垒壁阵十二，即双鱼座30（30 Psc）是双鱼座的一颗变星，视星等为+4.41，距离地球约430光年。
, 30 Piscium (30 Psc) atau YY Piscium adalah bintang yang berada pada jarak 415 tahun cahaya dari Bumi, yang berada di rasi Pisces. Bintang ini berkelas M3III dan bermagnitudo 4.37.
, 30 Piscium, som är stjärnans Flamsteed-bet … 30 Piscium, som är stjärnans Flamsteed-beteckning, är en ensam stjärna i den södra delen av stjärnbilden Fiskarna och har även variabelbeteckningen YY Piscium. Den har en genomsnittlig skenbar magnitud på ca 4,37 och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 7,9 mas, beräknas den befinna sig på ett avstånd på ca 410 ljusår (ca 127 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca –12 km/s.iocentrisk radialhastighet på ca –12 km/s.
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30 Piscium, som är stjärnans Flamsteed-bet … 30 Piscium, som är stjärnans Flamsteed-beteckning, är en ensam stjärna i den södra delen av stjärnbilden Fiskarna och har även variabelbeteckningen YY Piscium. Den har en genomsnittlig skenbar magnitud på ca 4,37 och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 7,9 mas, beräknas den befinna sig på ett avstånd på ca 410 ljusår (ca 127 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca –12 km/s.iocentrisk radialhastighet på ca –12 km/s.
, 30 Piscium (30 Psc) atau YY Piscium adalah bintang yang berada pada jarak 415 tahun cahaya dari Bumi, yang berada di rasi Pisces. Bintang ini berkelas M3III dan bermagnitudo 4.37.
, 30 Piscium (HIP 154) is a solitary variabl … 30 Piscium (HIP 154) is a solitary variable star in the zodiac constellation of Pisces. It is visible to the naked eye with an apparent visual magnitude of 4.37. Its calculated mid-value of antiposed parallax shift as the earth moves around the sun of very roughly 7.8859 mas, makes it around 410 light years away. Its net movement in the present epoch is one of moving closer – radial velocity (speed away from our star system) is −12 km/s.ed away from our star system) is −12 km/s.
, 垒壁阵十二，即双鱼座30（30 Psc）是双鱼座的一颗变星，视星等为+4.41，距离地球约430光年。
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30 Piscium
, 垒壁阵十二
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