Delta Crateris
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Star δ Crateris |
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| AladinLite | |||||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | cups | ||||||||||||||||||
| Right ascension | 11 h 19 m 20.4 s | ||||||||||||||||||
| declination | -14 ° 46 ′ 42.7 ″ | ||||||||||||||||||
| Apparent brightness | 3.56 mag | ||||||||||||||||||
| Typing | |||||||||||||||||||
| B − V color index | 1.12 | ||||||||||||||||||
| U − B color index | 0.97 | ||||||||||||||||||
| R − I index | 0.60 | ||||||||||||||||||
| Spectral class | K0 III | ||||||||||||||||||
| Astrometry | |||||||||||||||||||
| Radial velocity | (−5.2 ± 0.4) km / s | ||||||||||||||||||
| parallax | (17.56 ± 0.19) mas | ||||||||||||||||||
| distance | (186 ± 2) Lj (56.9 ± 0.6) pc |
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| Proper movement | |||||||||||||||||||
| Rec. Share: | (−124.67 ± 0.17) mas / a | ||||||||||||||||||
| Dec. portion: | (+207.59 ± 0.16) mas / a | ||||||||||||||||||
| Physical Properties | |||||||||||||||||||
| Dimensions | 1.0-1.4 M ☉ | ||||||||||||||||||
| radius | (22.44 ± 0.28) R ☉ | ||||||||||||||||||
| Luminosity |
(171.4 ± 9.0) L ☉ |
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| Effective temperature | (4408 ± 57) K. | ||||||||||||||||||
| Metallicity [Fe / H] | −0.48 | ||||||||||||||||||
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Other names and catalog entries |
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Delta Crateris (δ Crt, δ Crateris) is a star of the constellation Becher . Delta Crateris is a giant star of orange color, its radius is (22.44 ± 0.28) solar radii . Its spectral class is K0 and its apparent magnitude is 3.56 magnitudes; this makes it the apparently brightest star in the constellation.
Delta Crateris is 196 light years from Earth; despite its size, its mass is only 1.0–1.4 times that of the sun. Its luminosity is about 171 times that of the sun, and its effective surface temperature is (4408 ± 57) K.
Individual evidence
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ^ A b Sushma V. Mallik: Lithium abundance and mass. In: Astronomy and Astrophysics. 352, December 1999, pp. 495-507, bibcode : 1999A & A ... 352..495M .
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c d e f P. Berio, et al .: Chromosphere of K giant stars. Geometrical extent and spatial structure detection. In: Astronomy & Astrophysics. 535, November 2011: A59, arxiv : 1109.5476 , bibcode : 2011A & A ... 535A..59B , doi: 10.1051 / 0004-6361 / 201117479 .