40 Cancri

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Star
40 Cancri
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation cancer
Right ascension 08 h 40 m 11.45 s
declination + 19 ° 58 ′ 16.1 ″
Apparent brightness 6.6 likes
Typing
B − V color index +0.01 
Spectral class A1 V
Astrometry
Radial velocity 34.4 ± 0.6 km / s
parallax (5.21 ± 0.07)  mas
distance 625  ly
190  pc
Proper movement 
Rec. Share: −35.31 ± 0.11  mas / a
Dec. portion: −13.60 ± 0.07  mas / a
Physical Properties
Age (5 to 350) mill.  A
Other names
and catalog entries
Flamsteed name 40 Cancri
Bonn survey BD + 20 ° 2159
Henry Draper Catalog HD 73666 [1]
Hipparcos catalog HIP 42523 [2]
SAO catalog SAO 80336 [3]
Tycho catalog TYC 1395-806-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J08401145 + 1958161 [5]

40 Cancri is a star about 630  light years away and is in the open star cluster Messier 44 . He's one of the blue stragglers .

40 Cancri appears to be a slowly rotating star that does not have a strong magnetic field . It is believed that it was not created by mass transfer , but by the collision of a double star about 5 to 350 million years ago.

Web links

Individual evidence

  1. ↑ a b c d e f g 40 Cnc. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 24, 2018 .
  2. ↑ a b L. Fossati, p Mochnacki, J. Country Street, W. Weiss: Explaining the Praesepe blue straggler HD 73666 . In: A&A . 510, 2010. bibcode : 2010A & A ... 510A ... 8F . doi : 10.1051 / 0004-6361 / 200811495 .