1SWASP J093010.78+533859.5

{{Short description|Quintuple star system in the constellation Ursa Major}}

{{Requested move notice|1=V441 and V442 Ursae Majoris|2=Talk:1SWASP J093010.78+533859.5#Requested move 7 July 2025}}

{{Starbox begin}}

{{Starbox observe 2s

|epoch=J2000

|constell=Ursa Major{{cite constellation|TIC 318210930}}

|component1 = A

|ra1={{RA|09|30|10.7410}}

|dec1={{DEC|+53|38|59.825}}

|appmag_v1 = 9.84

|component2 = B

|ra2={{RA|09|30|10.9127}}

|dec2={{DEC|+53|38|58.356}}

|appmag_v2 = 10.98

}}

{{Starbox character

|component1 = A

|class=K1V + K5V

|variable=Algol

|component2 = B

|class2=K3V + K3V

|variable2=W UMa

}}

{{Starbox astrometry

|component1 = A

|radial_v={{val|12.24|0.17}}

|prop_mo_ra=+0.532

|prop_mo_dec=−6.970

|parallax=23.5622

|p_error=1.3138

|parallax_footnote=

|component2 = B

|prop_mo_ra2=−0.737

|prop_mo_dec2=−12.997

|parallax2=14.2625

|p_error2=0.0165

|parallax_footnote2=

}}

{{Starbox orbit

| reference =

| primary = Aa

| name = Ab

| period_unitless = 31.333 hours

| axis_unitless = {{val|5.762|0.010|ul=solar radius}}

| inclination = {{val|88.2|0.3}}

| eccentricity = 0

}}

{{Starbox orbit

| reference =

| primary = Ba

| name = Bb

| period_unitless = 5.465 hours

| axis_unitless = {{val|1.665|0.012|ul=solar radius}}

| inclination = {{val|86|4}}

| eccentricity = 0

}}

{{Starbox detail

|source=

|component1=J093010Aa

|mass={{val|0.837|0.008}}

|radius={{val|0.832|0.018}}

|temperature={{val|fmt=commas|5185|+25|−20}}

|gravity=4.52

|component2=J093010Ab

|mass2={{val|0.674|0.007}}

|radius2={{val|0.669|0.018}}

|temperature2={{val|fmt=commas|4325|+20|−15}}

|gravity2=4.62

}}

{{Starbox detail|no_heading=y

|component1= J093010Ba

|mass={{val|0.86|0.02}}

|radius={{val|0.79|0.04}}

|temperature={{val|fmt=commas|4700|50}}

|gravity=4.58

|luminosity={{val|6.20|0.05}}

|component2= J093010Bb

|mass2={{val|0.341|0.011}}

|radius2={{val|0.52|0.05}}

|temperature2={{val|fmt=commas|4700|50}}

|gravity2=4.53

|luminosity2={{val|7.12|0.05}}

}}

{{Starbox catalog

|names={{odlist |name=RX J0930.1+5339 |WDS=J09302+5339 }}{{efn|Simbad assigns the 1SWASP J093010.78+533859.5 designation to component B, but various sources make clear it applies to the whole "system" of four or five stars. Similarly, the designation 1SWASP J093012.84+533859.6 is also given to component B, but actually applies to an 18th-magnitude star 18" away.}}

|component2=A

|names2={{odlist |V=V441 UMa |TYC=3807-759-1 }}

|component3=B

|names3={{odlist |V=V442 UMa |TYC=3807-759-2 }}

}}

{{Starbox reference

|Simbad=TIC+318210930

|Simbad2=V441+UMa|sn2=A

|Simbad3=V442+UMa|sn3=B

}}

{{Starbox end}}

1SWASP J093010.78+533859.5 (abbreviated as J093010), also known as V441 Ursae Majoris and V442 Ursae Majoris is a quintuple star system located in the constellation Ursa Major.{{Cite journal|doi= 10.1088/0004-6256/147/5/104|title= 1SWASP J093010.78+533859.5: A Possible Hierarchical Quintuple System|date= 2014|last1= Koo|first1= Jae-Rim|last2= Lee|first2= Jae Woo|last3= Lee|first3= Byeong-Cheol|last4= Kim|first4= Seung-Lee|last5= Lee|first5= Chung-Uk|last6= Hong|first6= Kyeongsoo|last7= Lee|first7= Dong-Joo|last8= Rey|first8= Soo-Chang|journal= The Astronomical Journal|volume= 147|issue= 5|page= 104|arxiv= 1402.4575|bibcode= 2014AJ....147..104K}}{{Cite journal |last1=Lohr |first1=M. E. |last2=Norton |first2=A. J. |last3=Gillen |first3=E. |last4=Busuttil |first4=R. |date=June 12, 2015 |title=The doubly eclipsing quintuple low-mass star system 1SWASP J093010.78+533859.5 |journal=Astronomy & Astrophysics|volume=578 |pages=A103 |doi=10.1051/0004-6361/201525973 |arxiv=1504.07065 |bibcode=2015A&A...578A.103L }} The star system is located approximately 250 light-years from Earth, and was discovered using data from the "Super Wide Angle Search for Planets" (SuperWASP) project in the Canary Islands.