HD 73256
HD 73256 is a variable star in the southern constellation of Pyxis. It has the variable star designation CS Pyxidis. With a baseline apparent visual magnitude of 8.08, it requires a small telescope to view. The star is located at a distance of 120 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +30 km/s.

The stellar classification of this star is G8IV-VFe+0.5, which suggests a slightly evolved G-type main-sequence star with a mild overabundance of iron in the spectrum. It is a BY Draconis variable with a period of 13.97 days, showing a variation of 0.03 in magnitude due to chromospheric activity. The star appears overluminous for its class, which may be the result of a high metallicity. The star has roughly the same mass and a slightly smaller radius as the Sun, but is radiating 74% of the Sun's luminosity. It is around 2–3 billion years old and is spinning with a projected rotational velocity of 3.2 km/s.

In 2003, S. Udry and colleagues reported the discovery of a planet in orbit around HD 73256 using data from the CORALIE spectrograph. This object is a Hot Jupiter with at least 1.87 times the mass of Jupiter in an orbit with a period of 2.55 days. In 2018, K. Ment and colleagues reported an attempt to confirm the existence of this planet using Keck/HIRES data, but were unable to do so. Thus the existence of this object is disputed.
Q6243
variable star
Concept
Q8928
constellation
Concept
Q10473
Pyxis
CEL
Q593448
variable star designation
Concept
Q124313
apparent visual magnitude
Concept
Q531
light year
Concept
Q525
Sun
CEL
Q906561
parallax
Concept
Q240105
radial velocity
Concept
Q25377588
stellar classification
Concept
Q5864
G-type main-sequence star
Concept
Q797219
BY Draconis variable
Concept
Q190003
chromospheric activity
Concept
Q217030
metallicity
Concept
Q6464
projected rotational velocity
Concept
Q3830598
CORALIE spectrograph
MISC
Q382979
Hot Jupiter
CEL
Q651336
mass of Jupiter
Concept
Q1563404
HD 73256
CEL
Q1563404
HD 73256
CEL
2003-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2003
DATE
2018-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2018
DATE
+8.08^^http://www.w3.org/2001/XMLSchema#decimal
8.08
NUMBER
++30^^http://www.w3.org/2001/XMLSchema#decimal
+30
NUMBER
+8^^http://www.w3.org/2001/XMLSchema#decimal
8
NUMBER
++0.5^^http://www.w3.org/2001/XMLSchema#decimal
+0.5
NUMBER
+13.97^^http://www.w3.org/2001/XMLSchema#decimal
13.97
NUMBER
+0.03^^http://www.w3.org/2001/XMLSchema#decimal
0.03
NUMBER
+74^^http://www.w3.org/2001/XMLSchema#decimal
74
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+3.2^^http://www.w3.org/2001/XMLSchema#decimal
3.2
NUMBER
+1.87^^http://www.w3.org/2001/XMLSchema#decimal
1.87
NUMBER
+2.55^^http://www.w3.org/2001/XMLSchema#decimal
2.55
NUMBER
constellation
type of variable star
instance of