0
Alhena (center) with Mu Geminorum at upper right. Image: © Akira Fujii ---- A subgiant A star and the third brightest member of the constellation Gemini. Its Arabic name (alternatively given as Almeisan) refers to a brand on a horse or a camel. Alhena is a spectroscopic binary with a period of 12.6 years and is the brightest star ever observed to be occulted by an asteroid. In 1991, (381) Myrrha passed in front of Alhena enabling not only the asteroid's diameter (140 km) to be determined but also the fact that the dimmer companion star is a Sun-like G star almost 200 times fainter than Alhena proper. Accumulated observations have shown that the companion, of about one solar mass, orbits the 2.8-solar-mass primary at an average separation of about 8.5 AU - about the size of Saturn's orbit - but ranges from about as close as Earth is to the Sun to about the distance of Uranus.
Visual magnitude 1.93 Absolute magnitude -0.61 Spectral type A0IV Surface temperature 9,750 K Luminosity 160 Lsun Distance 105 light-years (32 pc) Position R.A. 06h 37m 42.7s,
Dec. +16° 23' 57" Other designations Almeisan, 24 Geminorum, HR 2421, BD +16°1223, HD 47105, GCTP1539.00, SAO 95912, FK5 251, HIP 31681 Alhena (center) with Mu Geminorum at upper right. Image: © Akira Fujii ---- A subgiant A star and the third brightest member of the constellation Gemini. Its Arabic name (alternatively given as Almeisan) refers to a brand on a horse or a camel. Alhena is a spectroscopic binary with a period of 12.6 years and is the brightest star ever observed to be occulted by an asteroid. In 1991, (381) Myrrha passed in front of Alhena enabling not only the asteroid's diameter (140 km) to be determined but also the fact that the dimmer companion star is a Sun-like G star almost 200 times fainter than Alhena proper. Accumulated observations have shown that the companion, of about one solar mass, orbits the 2.8-solar-mass primary at an average separation of about 8.5 AU - about the size of Saturn's orbit - but ranges from about as close as Earth is to the Sun to about the distance of Uranus.
Visual magnitude 1.93 Absolute magnitude -0.61 Spectral type A0IV Surface temperature 9,750 K Luminosity 160 Lsun Distance 105 light-years (32 pc) Position R.A. 06h 37m 42.7s,
Dec. +16° 23' 57" Other designations Almeisan, 24 Geminorum, HR 2421, BD +16°1223, HD 47105, GCTP1539.00, SAO 95912, FK5 251, HIP 31681
Still curious? Ask our experts.
Chat with our AI personalities
Jordan
Judy
RossAdd your answer:
Earn +20 pts
What sentence can you use for forecast?
the external remparture of the earth is much lower than the temperature far beneath the earths surface
How far is Joshua Tree from Pasadena CA?
It would be a two-two and a half hour drive depending on traffic. Why don't you mapquest or google earth it?
Scientists hypothesize that life may have existed once on what planets?
Yes, demonstrably the planet Earth has life. Scientists are currently looking for life on Mars (no proof of life recognized there yet) and are speculation that some extrasolar planets may be in the Goldilocks zone for life.
Cold temperatures increase or decrease the water table?
Heat would dry the earth. If the water table is down far enough it would not be affected.
How far is 10.88 astronomical units?
An astronomical unit is, by definition, the mean distance of the Sun to the Earth, which is about 149 500 000 kilometers. I guess you can make the multiplication yourself to get the answer.
