HR 4177
HR 4177, also called t² Carinae (t² Car), is a double star in the southern constellation of Carina. It is faintly visible to the naked eye with a combined apparent visual magnitude of +4.77. The two components are HD 92397 and HD 92398. The primary component is located at a distance of approximately 1,600 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +11 km/s. It has a peculiar velocity of and may be a runaway star. The star is a member of the BH 99 cluster.

The magnitude 4.85 primary, component A, is a massive K-type supergiant or bright giant with a stellar classification of K4.5Ib-II. Houk (1978) instead listed it with a class of K4/5III: but with some uncertainty about the classification. It has 12 times the mass of the Sun and has expanded to 202 times the Sun's radius. The star is radiating 8,478 times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,900 K.

The magnitude 7.48 companion star, component B, was discovered by J. Dunlop in 1829. As of 2015, it was located at an angular separation of along a position angle of 21°, relative to the primary. It is a B-type giant/bright giant star with a class of B9II/III. The pair show a common proper motion and roughly similar parallax measurements, but it remains unclear whether they form a gravitationally-bound pair.
Q13890
double star
Concept
Q8928
constellation
Concept
Q10470
Carina
CEL
Q124313
apparent visual magnitude
Concept
Q531
light year
Concept
Q525
Sun
CEL
Q906561
parallax
Concept
Q240105
radial velocity
Concept
Q1253791
peculiar velocity
Concept
Q6440
runaway star
Concept
Q25377588
K-type
Concept
Q193599
supergiant
Concept
Q5881
bright giant
Concept
Q25377588
stellar classification
Concept
Q180892
mass of the Sun
Concept
Q48440
Sun's radius
Concept
Q843877
luminosity of the Sun
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q375158
J. Dunlop
PER
Q1357788
angular separation
Concept
Q2105737
position angle
UNK
Q25377588
B-type
Concept
Q5875
giant
Concept
Q5881
bright giant
Concept
Q66477152
HR 4177
CEL
4177-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
4177
DATE
1829-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1829
DATE
2015-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2015
DATE
++4.77^^http://www.w3.org/2001/XMLSchema#decimal
+4.77
NUMBER
++11^^http://www.w3.org/2001/XMLSchema#decimal
+11
NUMBER
+99^^http://www.w3.org/2001/XMLSchema#decimal
99
NUMBER
+4.85^^http://www.w3.org/2001/XMLSchema#decimal
4.85
NUMBER
+4.5^^http://www.w3.org/2001/XMLSchema#decimal
4.5
NUMBER
+1978^^http://www.w3.org/2001/XMLSchema#decimal
1978
NUMBER
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
+5^^http://www.w3.org/2001/XMLSchema#decimal
5
NUMBER
+12^^http://www.w3.org/2001/XMLSchema#decimal
12
NUMBER
+7.48^^http://www.w3.org/2001/XMLSchema#decimal
7.48
NUMBER
+21^^http://www.w3.org/2001/XMLSchema#decimal
21
NUMBER
+9^^http://www.w3.org/2001/XMLSchema#decimal
9
NUMBER
constellation
instance of
subclass of