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Double star in the constellation Cancer
ι Cancri
Location of ι Cancri (circled)
Observation data
Epoch
J2000.0
Equinox
J2000.0
Constellation
Cancer
ι Cnc A
Right ascension
08h 46m 41.81988s
[1]
Declination
+28° 45′ 35.6190″
[1]
Apparent magnitude (V)
4.02
[2]
ι Cnc B
Right ascension
08h 46m 39.98118s
[1]
Declination
+28° 45′ 54.1932″
[1]
Apparent magnitude (V)
6.57
[3]
Characteristics
Spectral type
G8IIIa Ba0.2
[4] + A2V
[5]
Astrometry ι Cnc A
Radial velocity (Rv ) 15.74 ± 0.13
[6] km/s
Proper motion (μ)
RA: -21.58 ± 0.75
[1]
mas /
yr
Dec.: -45.69 ± 0.56
[1]
mas /
yr
Parallax (π) 9.85 ± 0.61
mas
[1]
Distance 330 ± 20
ly (102 ± 6
pc )
Absolute magnitude (MV ) −0.79
[7] ι Cnc B
Radial velocity (Rv ) 25.00 ± 1.5
[8] km/s
Proper motion (μ)
RA: -22.74 ± 3.45
[1]
mas /
yr
Dec.: -46.36 ± 2.56
[1]
mas /
yr
Parallax (π) 11.69 ± 2.75
mas
[1]
Distance approx. 280
ly (approx. 90
pc )
Details ι Cnc A
Mass 3.43
[9]
M ☉
Radius 21
[6]
R ☉
Luminosity 204
[6]
L ☉
Surface gravity (log g ) 2.5
[6]
cgs
Temperature 4,954
[7]
K
Metallicity [Fe/H]−0.14
[6]
dex
Rotational velocity (v sin i ) 170
[10] km/s ι Cnc B Luminosity 14.39
[11]
L ☉
Temperature 8,786
[11]
K
Age 263
[9]
Myr
Other designations 48 Cancri
Iota Cancri A :
HR 3475,
HD 74739,
BD +29°1824,
HIP 43103,
SAO 80416Iota Cancri B : HR 3474, HD 74738, BD+29°1823, HIP 43100, SAO 80415
Database references
SIMBAD
data
ι Cancri A and B (Jeffrey Fisher )
Iota Cancri (ι Cnc, ι Cancri) is a
double star in the
constellation
Cancer approximately 300
light years from
Earth .
The two stars of ι Cancri are separated by 30
arcseconds , changing only slowly. Although no orbit has been derived, the two stars show a large common
proper motion and are assumed to be gravitationally related.
[12]
The brighter star, ι Cancri A, is a yellow
G-type
giant with an
apparent magnitude of +4.02. It is a mild
barium star , thought to be formed by mass transfer of enriched material from an
asymptotic giant branch star onto a less evolved companion. No such donor has been detected in the ι Cancri system, but it is assumed that there is an unseen
white dwarf .
[13]
The fainter of the two stars, ι Cancri B, is a white
A-type
main sequence dwarf with an
apparent magnitude of +6.57. It is a shell star, surrounded by material expelled by its rapid rotation.
[14]
References
^
a
b
c
d
e
f
g
h
i
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^
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^
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^
a
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^
a
b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society . 427 (1): 343–357.
arXiv :
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doi :
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S2CID
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^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society . 389 (2): 869.
arXiv :
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^ Hauck, B.; Jaschek, C. (2000). "A-shell stars in the Geneva system". Astronomy and Astrophysics . 354 : 157.
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