RIK-210

{{Short description|Star located in Scorpius}}

{{Multiple issues|

{{Orphan|date=December 2022}}

{{more citations needed|date=February 2021}}

}}

{{Starbox begin

| name = RIK-210

}}

{{Starbox observe

| epoch = J2000

| equinox =

| constell = Scorpius

| ra = {{RA|16|23|24.544}}{{cite DR2|4324709330348851968}}

| dec = {{DEC|-17|17|27.14}}

| appmag_v =

}}

{{Starbox character

| engvar=en-US

| type = pre-main sequence star

| class = M2.5

| appmag_1_passband = Kp

| appmag_1 = 13.7

| appmag_2_passband = B

| appmag_2 = 16.213 ± 0.066

| appmag_3_passband = V

| appmag_3 = 14.630 ± 0.137

| appmag_4_passband = J

| appmag_4 = 10.61 ± 0.02

| appmag_5_passband = H

| appmag_5 = 9.85 ± 0.02

| appmag_6_passband = K

| appmag_6 = 9.65 ± 0.02

| appmag_7_passband =

| appmag_7 =

| appmag_8_passband =

| appmag_8 =

| r-i = 1.231 ± 0.217

| v-r = 0.537 ± 0.255

| b-v = 1.583 ± 0.203

| u-b =

| j-h = 0.76 ± 0.04

| j-k = 0.96 ± 0.04

| variable = EW

}}

{{Starbox astrometry

| radial_v =

| total_v =

| prop_mo_ra =

| prop_mo_dec =

| parallax =

| p_error =

| parallax_footnote =

| dist_ly =

| dist_pc = 145 ± 20

| absmag_v =

| absmag_bol =

}}

{{Starbox detail

| source =

| mass = 0.53 ± 0.13

| mass_mj =

| radius = 1.24 ± 0.125

| radius_rj =

| radius_km =

| luminosity =

| luminosity_bolometric =

| luminosity_visual =

| gravity =

| temperature = 3500

|rotation = 5.5 d

| rotational_velocity = 11 ± 1 km/s⁻¹

| age =

| age_myr = 7.5 ± 2.5

| age_gyr =

}}

{{Starbox catalog

| names = 2MASS J16232454-1717270, EPIC 205483258

}}

{{Starbox reference

| Simbad = 2MASS+J16232454-1717270

| NSTED = EPIC+205483258

| ARICNS =

| EPE =

| KIC =

}}

{{Starbox sources|

arXiv:1612.03907 [astro-ph.SR]|SIMBAD|NStED}}

{{Starbox end}}

RIK-210 is a star located north of Scorpius. It is known for its mysterious dimming events.{{cite web|last1=Nowakowski|first1=Tomasz|title=Astronomers observe mysterious dimming of a young nearby star|url=https://phys.org/news/2016-12-astronomers-mysterious-dimming-young-nearby.html|website=Phys.org|accessdate=5 August 2017|date=16 December 2016}}{{cite journal|last1=David|first1=Trevor J.|last2=Petigura|first2=Erik A.|last3=Hillenbrand|first3=Lynne A.|last4=Cody|first4=Ann Marie|last5=Cameron|first5=Andrew Collier|last6=Stauffer|first6=John R.|last7=Fulton|first7=B. J.|last8=Isaacson|first8=Howard T.|last9=Howard|first9=Andrew W.|last10=Howell|first10=Steve B.|last11=Everett|first11=Mark E.|last12=Wang|first12=Ji|last13=Benneke|first13=Björn|last14=Hellier|first14=Coel|last15=West|first15=Richard G.|last16=Pollacco|first16=Don|last17=Anderson|first17=David R.|title=A Transient Transit Signature Associated with the Young Star RIK-210|journal=The Astrophysical Journal|date=27 January 2017|volume=835|issue=2|pages=168|doi=10.3847/1538-4357/835/2/168|arxiv = 1612.03907 |bibcode = 2017ApJ...835..168D |s2cid=2323788 |doi-access=free }} The dips are observed with stable period of 5.667 days, but their triangular shape is inconsistent with the planetary eclipses. Instead, the diffuse cloud on synchronous orbit may be responsible.{{citation|arxiv=1702.01797|year=2017|title=Orbiting Clouds of Material at the Keplerian Co-rotation Radius of Rapidly Rotating Low-mass WTTS in Upper Sco|doi=10.3847/1538-3881/aa5eb9 |last1=Stauffer |first1=John |last2=Cameron |first2=Andrew Collier |last3=Jardine |first3=Moira |last4=David |first4=Trevor J. |last5=Rebull |first5=Luisa |last6=Cody |first6=Ann Marie |last7=Hillenbrand |first7=Lynne A. |last8=Barrado |first8=David |last9=Wolk |first9=Scott |last10=Davenport |first10=James |last11=Pinsonneault |first11=Marc |journal=The Astronomical Journal |volume=153 |issue=4 |page=152 |bibcode=2017AJ....153..152S |s2cid=35276346 |doi-access=free }}