HD 202628

{{Starbox image

| image = {{CSS image crop|Image=The 74 exocomet belts imaged by ALMA’s REASONS survey, showing belts of all shapes, sizes and ages (REASONS comboplot full nonames).jpg|bSize=2400|cWidth=240|cHeight=240|oTop=1430|oLeft=1434|Location=center}}

| caption = Image of the disk from the REASONS survey

| credit =

}}

{{Starbox observe

| epoch = J2000.0

| constell = Microscopium

| ra = {{RA|21|18|27.26933}}

| dec = {{DEC|−43|20|04.7461}}

| appmag_v = {{val|+6.742|0.004}}

}}

{{Starbox character

| type =

| class = G1.5V

| b-v = {{val|+0.637|0.001}}

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|+12.071|0.0027}}

| prop_mo_ra = +242.190

| prop_mo_dec = +21.633

| parallax = 41.9622

| p_error = 0.0455

| parallax_footnote =

| absmag_v = {{val|4.856|0.005}}

}}

{{Starbox detail

| source =

| age_gyr = {{Val|1.1|0.4|u=Gyr}}
{{val|2.3|1}}

| rotational_velocity = {{Val|2.64|0.11}}

| metal_fe = {{Val|0.003|0.004}}

| mass = {{val|1.068|0.038}}

| gravity = {{Val|4.510|0.011}}

| temperature = {{Val|5843|6|fmt=commas}}

| radius = {{val|0.951|0.013}}

| luminosity = {{val|0.951|0.026}}

}}

{{Starbox catalog

| names = {{odlist | CD=−43°14464 | GJ=825.2 & 9730 | HD=202628 | HIP=105184 | HR= | LTT=8444 | SAO=230622 }}

}}

{{Starbox reference

| Simbad = HD+202628

| NSTED = HD+202628

| EPE = HD+202628

}}

HD 202628 is a single star in the southern constellation of Microscopium. It has an apparent visual magnitude of +6.7, which makes it too faint to be readily visible to the naked eye. The star is located at a distance of 77.7 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +12.1 km/s. The absolute magnitude of this star is 4.86.

The stellar classification of HD 202628 is G1.5V, matching a yellow-hued G-type main-sequence star similar to the Sun. The chromospheric activity level and amount of X-ray emission is consistent with a star that is younger than the Sun. It is spinning with a projected rotational velocity of 2.6 km/s. The star has 107% of the mass of the Sun and 95% of the Sun's radius. The metallicity, or abundance of heavier elements, appears to be about the same as in the Sun. It is radiating 95% of the luminosity of the Sun from its photosphere at an effective temperature of 5,843 K.

In 2010, an infrared excess from a circumstellar disk of dust was detected around this star by the Spitzer Space Telescope. The net emission at 70 microns (70 μm) is almost 20 times as high as the star's flux at this wavelength. The disk has been directly imaged by the Hubble Space Telescope. It is oval-shaped with an orbital eccentricity of 0.18, and is inclined at 64° to the line of sight from the Earth. The inner edge of the ring, which lies at around 158 AU from the star, is sharply defined. This suggests that there is an exoplanet responsible for this defined edge, and it has been calculated as orbiting between 86 and 158 AU from HD 202628.

{{OrbitboxPlanet begin

| period_unit = year

}}

{{OrbitboxPlanet hypothetical

| exoplanet = b

| semimajor = 86-158

| eccentricity = ~ 0.2

| period =

| mass_earth = > 1

}}

{{OrbitboxPlanet disk

| disk = Disk

| periapsis = 150

| apoapsis = 220

| inclination = 64°

}}

References

{{reflist|refs=

{{cite simbad

| title=9 Cet | access-date=2020-12-23 }}

{{citation | postscript=.

| title=Multiplicity among Solar-type Stars

| last1=Fuhrmann | first1=K. | last2=Chini | first2=R.

| last3=Kaderhandt | first3=L. | last4=Chen | first4=Z.

| display-authors=1 | journal=The Astrophysical Journal

| bibcode=2017ApJ...836..139F | doi=10.3847/1538-4357/836/1/139 | doi-access=free }}

{{citation

| title=From Scattered-light to Millimeter Emission: A Comprehensive View of the Gigayear-old System of HD 202628 and its Eccentric Debris Ring

| last1=Faramaz | first1=Virginie | last2=Krist | first2=John

| last3=Stapelfeldt | first3=Karl R. | last4=Bryden | first4=Geoffrey

| last5=Mamajek | first5=Eric E. | last6=Matrà | first6=Luca

| last7=Booth | first7=Mark | last8=Flaherty | first8=Kevin

| last9=Hales | first9=Antonio S. | last10=Hughes | first10=A. Meredith

| last11=Bayo | first11=Amelia | last12=Casassus | first12=Simon

| last13=Cuadra | first13=Jorge | last14=Olofsson | first14=Johan

| last15=Su | first15=Kate Y. L. | last16=Wilner | first16=David J.

| display-authors=1 | journal=The Astronomical Journal | postscript=.

| arxiv=1909.04162 | bibcode=2019AJ....158..162F

| doi=10.3847/1538-3881/ab3ec1 | s2cid=202542536 | doi-access=free }}

{{citation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters | postscript=.

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{citation

| title=Hubble Space Telescope Observations of the HD 202628 Debris Disk

| first1=John E. | last1=Krist | first2=Karl R. | last2=Stapelfeldt

| first3=Geoffrey | last3=Bryden | first4=Peter | last4=Plavchan

| journal=The Astronomical Journal | display-authors=1

| bibcode=2012AJ....144...45K | doi=10.1088/0004-6256/144/2/45

| arxiv=1206.2078 | s2cid=40040285 | postscript=. }}

{{citation

| title=The Solar Twin Planet Search. IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars

| display-authors=1 | last1=dos Santos | first1=Leonardo A.

| last2=Meléndez | first2=Jorge | last3=do Nascimento | first3=José-Dias

| last4=Bedell | first4=Megan | last5=Ramírez | first5=Iván

| last6=Bean | first6=Jacob L. | last7=Asplund | first7=Martin

| last8=Spina | first8=Lorenzo | last9=Dreizler | first9=Stefan

| last10=Alves-Brito | first10=Alan | last11=Casagrande | first11=Luca

| journal=Astronomy & Astrophysics | postscript=.

| doi=10.1051/0004-6361/201628558 | bibcode=2016A&A...592A.156D |arxiv = 1606.06214 | s2cid=53533614 }}

{{citation

| title=Gap Clearing by Planets in a Collisional Debris Disk

| last1=Nesvold | first1=Erika R. | last2=Kuchner | first2=Marc J.

| journal=The Astrophysical Journal | postscript=.

| bibcode=2015ApJ...798...83N | arxiv=1410.7784

| doi= 10.1088/0004-637X/798/2/83 | s2cid=118667155 }}

{{citation

| title=The Correlation between Metallicity and Debris Disk Mass

| display-authors=1 | last1=Gáspár | first1=András

| last2=Rieke | first2=George H | last3=Ballering | first3=Nicholas

| journal=The Astrophysical Journal | postscript=.

| volume=826 | issue=2 | pages=171 | year=2016

| bibcode=2016ApJ...826..171G | arxiv=1604.07403

| doi=10.3847/0004-637X/826/2/171 | s2cid=119241004 | doi-access=free }}

{{Cite arxiv |eprint=2501.09058 |class=astro-ph |last=Matrà |first=L. |title=REsolved ALMA and SMA Observations of Nearby Stars (REASONS): A population of 74 resolved planetesimal belts at millimetre wavelengths |date=2025-01-15 |last2=Marino |first2=S. |last3=Wilner |first3=D. J. |last4=Kennedy |first4=G. M. |last5=Booth |first5=M. |last6=Krivov |first6=A. V. |last7=Williams |first7=J. P. |last8=Hughes |first8=A. M. |last9=Burgo |first9=C. del}}

}}

Category:G-type main-sequence stars

Category:Circumstellar disks

Category:Hypothetical planetary systems

Category:Microscopium

Category:Durchmusterung objects

0825.2

202628

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