HD 28254 b

{{Short description|Extrasolar planet in the constellation Dorado}}

{{Infobox planet

| name = HD 28254 b

| discovery_ref =

| discoverer = Naef et al.

| discovery_site = La Silla Observatory

| discovered = October 19, 2009

| discovery_method = radial velocity (HARPS)

| orbit_ref =

| apsis = astron

| aphelion = 4.78 AU

| perihelion = 0.12 AU

| semimajor = {{val|2.45|0.03|0.04|ul=AU}}

| period = {{val|1333|4|ul=days|fmt=commas}}
{{val|3.65|0.01|ul=yr}}

| eccentricity = {{val|0.95|0.03|0.04}}

| inclination = {{val|21|38|11|u=deg}} or {{val|162|7|27|u=deg}}

| asc_node = {{val|248|53|33|u=deg}} or {{val|163|38|36|u=deg}}

| time_periastron = {{val|2454246|9|10|ul=JD|fmt=commas}}

| arg_peri = {{val|289|20|18|ul=deg}}

| semi-amplitude = {{val|37.3|5.1|0.9|ul=m/s}}

| star = HD 28254

| mass = {{val|3.8|3.0|2.2|ul=Jupiter mass}}

| mean_radius =

| single_temperature = {{val|207|13|40|ul=K}}{{cn|date=December 2023}}

| surface_grav =

}}

HD 28254 b (also known as HIP 20606 b) is an exoplanet which orbits the G-type main sequence star HD 28254, located 180 light-years away in the constellation Dorado.

Discovery

The planet was discovered in a survey by HARPS along with 29 other planets in 2009.

Properties

Due to the planet's high mass, it is assumed to be a gas giant like Jupiter. Since HD 28254 b was detected indirectly, properties such as its inclination, radius, and temperature are unknown. HD 28254 takes about 3 years to orbit its host and has one of the most eccentric orbits around a star. In 2023, the inclination and true mass of HD 28254 b were measured via astrometry, though the mass remains uncertain - it is between about 1.6 and 6.8 times the mass of Jupiter.

References

{{Reflist|refs=

{{cite journal |doi=10.1051/0004-6361/200913616 |title=The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars |last1=Naef |first1=Dominique |last2=Mayor |first2=Michel |last3=Lo Curto |first3=Gaspare |last4=Bouchy |first4=François |last5=Lovis |first5=Christophe |last6=Moutou |first6=Claire |last7=Benz |first7=Willy |last8=Pepe |first8=Francesco |last9=Queloz |first9=Didier |last10=Santos |first10=Nuno C. |last11=Ségransan |first11=Damien |last12=Udry |first12=Stéphane |last13=Bonfils |first13=Xavier |last14=Delfosse |first14=Xavier |last15=Forveille |first15=Thierry |last16=Hébrard |first16=Guillaume |last17=Mordasini |first17=Christoph |last18=Perrier |first18=Christian |last19=Boisse |first19=Isabelle |last20=Sosnowska |first20=Danuta |journal=Astronomy and Astrophysics |volume=523 |page=A15 |year=2010 |arxiv=1008.4600 |bibcode=2010A&A...523A..15N |s2cid=118845989 |url=http://www.aanda.org/articles/aa/full_html/2010/15/aa13616-09/aa13616-09.html }}

{{cite journal |last1=Philipot |first1=F. |last2=Lagrange |first2=A.-M. |display-authors=etal |date=October 2023 |title=A multi-technique approach to identifying and/or constraining radial-velocity substellar companions |journal=Astronomy & Astrophysics |volume=678 |issue= |pages=A107 |doi=10.1051/0004-6361/202346612 |arxiv=2308.05417 |bibcode=2023A&A...678A.107P |s2cid=260775968}}

}}

Category:Exoplanets discovered in 2009

Category:Exoplanets detected by radial velocity

Category:Exoplanets detected by astrometry

Category:Giant planets

Category:Dorado