What are the absolute and apparent magnitudes of Acrux?
Acrux apparent magnitude is 0.77, this is a measure of the brightness of the star as seen from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, Acrux absolute magnitude is -4.19 If you used the 2007 Parallax value, Acrux absolute magnitude is -4.20.
Is Acrux brighter than the sun from Earth?
Acrux is at around 321 light-years / 99 parsecs away from the Sun. Acrux is part of the asterism known as the Southern Cross, the star system has a combined visual magnitude of +0.76. It is around 17.80 times more massive than our Sun and around 25.000 times brighter.
What is the mass of Acrux?
Acrux is located in the constellation Crux. Crux is the smallest of the 88 constellations, but also one of the most recognizable ones in the southern hemisphere….Alpha Crucis C – HR 4729.
| Spectral class | B5 V |
|---|---|
| Mass | 9.65 M☉ |
| Radius | 5.5 R☉ |
| Age | 12 million years |
| Rotational velocity | 131 km/s |
What color is the Acrux star?
blue
The two stars in the Acrux system are blue in color and separated from each other by 4.5 arc seconds. The integrated apparent, or visual, magnitude of Acrux is +0.87.
What is the luminosity of Acrux?
16,000 L ☉
Acrux
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Mass | 15.52 M ☉ |
| Radius | 5.4 R ☉ |
| Luminosity | 16,000 L ☉ |
| Temperature | 28,000 K |
What is Acrux made of?
It is located approximately 320 light years away and is a multiple star system composed of Alpha-1 Crucis (a B class subgiant) and Alpha-2 Crucis (a B class dwarf). Both stars are very hot and their respective luminosities are 25,000 and 16,000 times that of the Sun.
Is Acrux A double star?
Acrux is really two stars. Acrux is located about 321 light-years from Earth, and it is, in fact, not one star but two nearly identical B-class stars. These can be resolved – separated – in a small telescope, making Acrux a nice double star, although, to the unaided eye, Acrux appears as a single star.
How did Acrux get its name?
History and mythology of Acrux. Unlike many star names, which are Arabic, Latin or Greek proper names, Acrux is simply a combination of “A” (for Alpha) and Crux as the name of the constellation.
Who discovered Acrux?
However, historians generally credit Portugese astronomer Joao Faras with the discovery, which occurred in 1500 when he spotted it from Brazil and named it “Las Guardas” (“the guards”). By the late 16th century, Crux began to be depicted as a separate constellation on celestial globes and maps.