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Spica is the brightest star in the constellation of Virgo (lower left). As one of the nearest massive binary star systems to the Sun, Spica has been the subject of many observational studies. [17] Spica is believed to be the star that gave Hipparchus the data that led him to discover the precession of the equinoxes. [18]
To find this star easily, locate the Big Dipper and follow the curve of its handle. This curve will first lead to Arcturus. Finally, "drive a spike" directly to Spica. [16] The constellation of Virgo. Spica is made up of two individual stars, Spica A and Spica B, with radii of 7.40 and 3.64 times the Sun's, respectively. [17]
Animated 3D map of the nearest stars, centered on the Sun. 3D red green glasses are recommended to view this image correctly. A radar map of the distances ( ) and positions ( ) of all known stellar bodies or systems within 9 light years (ly) (for within 12 ly see this map).
It is located about 10° due west of Spica. NGC 4639 is a face-on barred spiral galaxy located 78 Mly from Earth (redshift 0.0034). Its outer arms have a high number of Cepheid variables, which are used as standard candles to determine astronomical distances.
The Space Infrared Telescope for Cosmology and Astrophysics (SPICA), was a proposed infrared space telescope, follow-on to the successful Akari space observatory. It was a collaboration between European and Japanese scientists, which was selected in May 2018 by the European Space Agency (ESA) as a finalist for the next Medium class Mission 5 (M5) of the Cosmic Vision programme, to launch in ...
Asteroid 65 Cybele and two stars in the constellation Aquarius, with their magnitudes labeled. Apparent magnitude (m) is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites.
And even among those Stars which are reckoned of the brightest Class, there appears a Variety of Magnitude; for Sirius or Arcturus are each of them brighter than Aldebaran or the Bull's Eye, or even than the Star in Spica; and yet all these Stars are reckoned among the Stars of the first Order: And there are some Stars of such an intermedial ...
By continuing in this path, one can find Spica, "Arc to Arcturus, then spike (or speed on) to Spica". [17] [18] Together with the bright stars Spica and Regulus (or Denebola, depending on the source), Arcturus is part of the Spring Triangle asterism. With Cor Caroli, these four stars form the Great Diamond asterism.