3 Cancri

{{Starbox begin

| name = 3 Cancri

}}

{{Starbox observe

| epoch = J2000.0

| constell = Cancer

| ra = {{RA|08|00|47.30744}}

| dec = {{DEC|+17|18|31.3283}}

| appmag_v = 5.60

}}

{{Starbox character

| type = horizontal branch (86% chance)

| class = K3 III

| r-i =

| v-r =

| b-v = 1.317

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+39.55|0.16}}

| prop_mo_ra = −10.403

| prop_mo_dec = −3.905

| parallax = 4.0087

| p_error = 0.1511

| parallax_footnote =

| absmag_v = −1.29

}}

{{Starbox detail

| source =

| mass = 2.9

| radius = 40

| luminosity = 568.61

| temperature = 4,300

| gravity = 2.05

| metal_fe =

| rotational_velocity = 5.73

| age_myr =

}}

{{Starbox catalog

| names = {{odlist | F=3 Cnc | BD=+17°1731 | FK5=2618 | HD=65759 | HIP=39177 | HR=3128 | SAO=97472 }}

}}

{{Starbox reference

| Simbad = 3+Cnc

}}

3 Cancri is a single star in the zodiac constellation of Cancer, located around 810 light years from the Sun. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.60. This object is moving further from the Earth with a heliocentric radial velocity of +39.5 km/s, and may be a member of the Hyades group. It is located near the ecliptic and thus is subject to lunar eclipses.

This is an aging giant star with a stellar classification of K3 III that is most likely (86% chance) on the horizontal branch. The star has 2.9 times the mass of the Sun and has expanded to 40 times the Sun's radius. It is radiating 569 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,300 K.

Planetary system

A candidate super-Jupiter exoplanet or brown dwarf orbiting 3 Cancri was detected in 2020 on a very mildly eccentric orbit using the radial velocity method.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet hypothetical

| exoplanet = b

| mass = {{val|20.76|0.72|0.73|p=≥}}

| semimajor = {{val|2.52|0.03|0.04}}

| period = {{val|853.64|4.76|4.73}}

| eccentricity = {{val|0.04|0.04|0.03}}

}}

References

{{Reflist|refs=

{{citation

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| doi=10.1086/129303 | bibcode=1972PASP...84..406E | doi-access=free }}

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| bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}

{{citation

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{{citation

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{{citation

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| journal=Astronomy & Astrophysics | postscript=.

| id=A33 | pages=15 | volume=616 | date=August 2018

| bibcode=2018A&A...616A..33S | doi=10.1051/0004-6361/201833111 | arxiv=0709.1145 | s2cid=119361866 }}

{{citation

| title=The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars

| journal=Astrophysical Journal | display-authors=1

| last1=Adams | first1=Walter S. | last2=Joy | first2=Alfred H.

| last3=Humason | first3=Milton L. | last4=Brayton | first4=Ada Margaret

| volume=81 | pages=187 | year=1935

| bibcode=1935ApJ....81..187A | doi=10.1086/143628 | doi-access=free }}

{{cite journal |doi=10.1051/0004-6361/202038285 |title=Precise radial velocities of giant stars |year=2020 |last1=Pinto |first1=Marcelo Tala |last2=Reffert |first2=Sabine |last3=Quirrenbach |first3=Andreas |last4=Stock |first4=Stephan |last5=Trifonov |first5=Trifon |last6=Mitchell |first6=David S. |journal=Astronomy & Astrophysics |volume=644 |pages=A1 |hdl=10150/622444 |hdl-access=free |bibcode=2020A&A...644A...1T}}

}}

Category:K-type giants

Category:Cancer (constellation)

Category:Horizontal-branch stars

3 Cancri

Planetary system

See also

References