HIP 70849

{{Starbox observe

| epoch = J2000.0

| constell = Lupus

| ra = {{RA|14|29|18.56436}}

| dec = {{DEC|−46|27|49.7378}}

| appmag_v = 10.36

}}

{{Starbox character

| type =

| class = K7Vk

| appmag_1_passband = B

| appmag_1 = 11.787

| appmag_2_passband = J

| appmag_2 = 7.639{{±|0.023}}

| appmag_3_passband = H

| appmag_3 = 7.006{{±|0.061}}

| appmag_4_passband = K

| appmag_4 = 6.790{{±|0.027}}

| r-i =

| v-r =

| b-v = 1.427{{±|0.019}}

| u-b =

| variable = 8.50

}}

{{Starbox astrometry

| radial_v = {{val|−0.134|0.0013}}

| prop_mo_ra = {{val|−44.051|0.017}}

| prop_mo_dec = {{val|−201.577|0.020}}

| pm_footnote =

| parallax = 41.4618

| p_error = 0.0175

| parallax_footnote =

| absmag_v = 8.5

}}

{{Starbox detail

| source =

| mass = 0.63{{±|0.03}}
0.76{{±|0.07}}

| radius = 0.62{{±|0.02}}

| gravity = 3.70{{±|0.09}}

| luminosity_bolometric = 0.0892{{±|0.0005}}

| temperature = {{val|4103|25|fmt=commas}}

| metal_fe = 0.00{{±|0.03}}

| age_gyr = 3.6{{±|0.15}}

| rotation = {{val|41.2|u=days}}

| rotational_velocity = {{val|1.93|u=km/s}}
0.30{{±|0.30}}

}}

{{Starbox catalog

| names = {{odlist | CD=−45°9206 | GJ=550.3 | HIP=70849 | LTT=5717 | NLTT=37446 | NSV=6678 | PPM=760399 }}

}}

{{Starbox reference

| Simbad = HIP+70849

| NSTED = HIP+70849

| EPE = HIP+70849

}}

HIP 70849 is a star with two non-stellar companions in the southern constellation Lupus. It is a 10th magnitude star, making it too faint to be visible to the naked eye. The system is located at a distance of 78.7 light-years from the Sun based on parallax measurements.

This is a K-type main-sequence star with a stellar classification of K7Vk, where the 'k' indicates interstellar absorption features in the spectrum. The star is magnetically active with a {{val|10.1|1.4|u=yr}} starspot cycle. It appears about 3.6 billion years old and the light emission shows a 41.2 day periodicity, which is likely the rotation period. This star, which resembles a brighter red dwarf, is smaller and less massive than the Sun. It is radiating just 9% of the luminosity of the Sun from its photosphere at an effective temperature of 4,103 K.

In 2009, a gas giant planet was found in orbit around it. Designated HIP 70849 b, it has 4.5 times the mass of Jupiter and takes more than 3000 days to orbit at a semimajor axis of {{val|3.99|ul=AU}}, with a high eccentricity. There is also a T4.5 brown dwarf companion orbiting ~9000AU from HIP 70849.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|4.5|0.4|0.3}}

| period = {{val|3649|18}}

| semimajor = {{val|3.99|0.06|0.07}}

| eccentricity = {{val|0.65|0.02|0.01}}

| inclination = {{val|96|16}}

}}

References

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| title=The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849

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{{cite journal |last1=Šubjak |first1=J. |last2=Lodieu |first2=N. |display-authors=etal |title=Search for planets around stars with wide brown dwarfs |journal=Astronomy & Astrophysics |year=2023 |volume= 671|issue= |pages= A10|doi= 10.1051/0004-6361/202244238|arxiv=2212.03757|bibcode=2023A&A...671A..10S |s2cid=254366726 }}

{{cite journal |last1=Philipot |first1=F. |last2=Lagrange |first2=A.-M. |display-authors=etal |arxiv=2301.01263 |title=Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry |journal=Astronomy & Astrophysics |date=January 2023|volume=670 |pages=A65 |doi=10.1051/0004-6361/202245396 |bibcode=2023A&A...670A..65P |s2cid=255393653 }}

}}

Category:K-type main-sequence stars

Category:Planetary systems with one confirmed planet

Category:Lupus (constellation)

Category:Durchmusterung objects

0550.3

070849

Category:T-type brown dwarfs

HIP 70849

See also

References