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| epoch = J2000
| constell = Ursa Major
| ra = {{RA|09|47|11.941}}
| dec = {{DEC|+51|54|08.95}}
| appmag_v = {{val|12.4|to|15.2}}

| type =
| class =
| b-v =
| variable = Dwarf nova(?)

| radial_v =
| prop_mo_ra = 33.659
| prop_mo_dec = −6.209
| pm_footnote =
| parallax = 2.8039
| p_error = 0.0205
| parallax_footnote =
| absmag_v =

| reference =
| primary =
| name =
| period =
| period_unitless = {{val|0.06366|0.00003|u=days|fmt=commas}}
| axis =
| axis_unitless =
| eccentricity = 0.00 (assumed)
| inclination = 18–50
| node =
| periastron = {{val|2449740.0637|0.0008|ul=HJD|fmt=commas}}
| periarg = 0.00 (assumed)
| periarg_primary =
| k1 = 48{{±|4}}
| k2 =

| source =
| component1 = White dwarf
| mass = 1.0{{±|0.2}}
| radius =
| luminosity =
| gravity =
| temperature = 32,000
| metal_fe =
| rotational_velocity =
| age_myr =
| component2 = Donor star
| mass2 = 0.10

| names = {{odlist | name=PG 0943+521 | V=ER UMa | GSC=03439-00550 | 2MASS=J09471193+5154089 | AAVSO=0939+52 {edih}

| Simbad = ER+UMa

| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085
| s2cid=125853869 | postscript=. }}

| title=Orbital Periods for the Unusual Dwarf Novae ER Ursae Majoris and V1159 Orionis
| last1=Thorstensen | first1=J. R. | last2=Taylor | first2=C. J.
| last3=Becker | first3=C. M. | last4=Remillard | first4=R. A.
| journal=Publications of the Astronomical Society of the Pacific
| volume=109 | pages=477–482 | date=April 1997
| doi=10.1086/133904 | bibcode=1997PASP..109..477T | s2cid=121582607
| doi-access=free }}

| title=Discovery of a Peculiar SU UMa-Type Dwarf Nova ER Ursae Majoris
| last1=Kato | first1=Taichi | last2=Kunjaya | first2=Chatief
| journal=Publications of the Astronomical Society of Japan
| volume=47 | pages=163–168 | date=April 1995
| bibcode=1995PASJ...47..163K }}

| title=Cataclysmic variable candidates from the Palomar Green Survey
| last1=Green | first1=R. F. | last2=Ferguson | first2=D. H.
| last3=Liebert | first3=J. | last4=Schmidt | first4=M.
| journal=Publications of the Astronomical Society of the Pacific
| volume=94 | page=560-564 | date=June 1982 | display-authors=1
| doi=10.1086/131022 | bibcode=1982PASP...94..560G | s2cid=120644760
}}

| title=Large-Amplitude Superhumps in ER Ursae Majoris during the Earliest Stage of a Superoutburst
| display-authors=1 | last1=Kato | first1=Taichi
| last2=Nogami | first2=Daisaku | last3=Masuda | first3=Seiji
| journal=Publications of the Astronomical Society of Japan
| volume=48 | pages=L5–L7 | date=February 1996
| doi=10.1093/pasj/48.1.L5 | bibcode=1996PASJ...48L...5K }}

| title=FUSE and IUE Spectroscopy of the Prototype Dwarf Nova ER Ursa Majoris During Quiescence
| display-authors=1 | last1=Guzman | first1=Giannina
| last2=Sion | first2=Edward M. | last3=Godon | first3=Patrick
| journal=The Astronomical Journal
| volume=158 | issue=3 | id=99
| date=September 2019 | page=99
| doi=10.3847/1538-3881/ab322f
| arxiv=1907.06513 | bibcode=2019AJ....158...99G | s2cid=196622682
| doi-access=free
}}

| last1=Zhao | first1=Yinghe | last2=Li | first2=Zongyun | last3=Wu | first3=Xiaoan
| last4=Peng | first4=Qiuhe | last5=Zhang | first5=Zhousheng | last6=Li | first6=Zili
| title=Superhumps Behavior during Normal Outbursts in ER Ursae Majoris: Spectroscopy and Photometry
| journal=Publications of the Astronomical Society of Japan | bibcode=2006PASJ...58..367Z
| date=April 2006 | volume=58 | issue=2 | pages=367–373 |doi=10.1093/pasj/58.2.367
| arxiv=astro-ph/0602181 | url=https://academic.oup.com/pasj/article/58/2/367/1515863 | access-date=25 October 2022| doi-access=free }}

| title=Study of a long and short—term variability of ER Ursae Majoris
| last1=Zemko | first1=P. | last2=Shugarov | first2=S.
| last3=Kato | first3=T. | last4=Katysheva | first4=N.
| journal=Contributions of the Astronomical Observatory Skalnaté Pleso
| volume=43 | issue=3 | pages=319–324
| date=March 2014 | bibcode=2014CoSka..43..319Z }}

| title=Detection of Change in Supercycles in ER Ursae Majoris
| display-authors=1 | last1=Zemko | first1=Polina
| last2=Kato | first2=Taichi | last3=Shugarov | first3=Sergei Yu.
| journal=Publications of the Astronomical Society of Japan
| volume=65 | issue=3 | id=54 | page=8
| date=June 2013 | doi=10.1093/pasj/65.3.54
| arxiv=1212.5940 | bibcode=2013PASJ...65...54Z }}

| title=Discovery of Negative Superhumps during a Superoutburst of 2011 January in ER Ursae Majoris
| last1=Ohshima | first1=Tomohito | last2=Kato | first2=Taichi
| last3=Pavlenko | first3=Elena P. | last4=Itoh | first4=Hiroshi
| last5=de Miguel | first5=Enrique | last6=Krajci | first6=Thomas
| last7=Akazawa | first7=Hidehiko | last8=Shiokawa | first8=Kazuhiko
| last9=Stein | first9=William | last10=Baklanov | first10=Alex
| last11=Samsonov | first11=Denis | last12=Antonyuk | first12=Oksana
| last13=Andreev | first13=Maksim V. | last14=Imamura | first14=Kazuyoshi
| last15=Hambsch | first15=Franz-Josef | last16=Maehara | first16=Hiroyuki
| last17=Ruiz | first17=Javier | last18=Nakagawa | first18=Shin’ichi
| last19=Kasai | first19=Kiyoshi | last20=Boitnott | first20=Boyd
| last21=Virtanen | first21=Jani | last22=Miller | first22=Ian
| journal=Publications of the Astronomical Society of Japan
| display-authors=1 | volume=64 | issue=4
| date=August 2012 | pages=L3
| doi=10.1093/pasj/64.4.L3
| arxiv=1207.2705 | bibcode=2012PASJ...64L...3O }}

| title=Large-Amplitude Modulations of the Cataclysmic Star ER UMa
| last1=Kjurkchieva | first1=D. | last2=Marchev | first2=D.
| journal=Publications of the Astronomical Observatory of Belgrade
| volume=90 | pages=147–150
| date=September 2010 | bibcode=2010POBeo..90..147K }}

| title=Unusual Phase Reversal of Superhumps in ER Ursae Majoris
| display-authors=1 | last1=Kato | first1=Taichi
| last2=Nogami | first2=Daisaku | last3=Masuda | first3=Seiji
| journal=Publications of the Astronomical Society of Japan
| volume=55 | issue=2 | pages=L7–L10
| date=April 2003 | doi=10.1093/pasj/55.2.L7
| arxiv=astro-ph/0211520 | bibcode=2003PASJ...55L...7K }}

| title=Superhumps in a Peculiar SU Ursae Majoris-Type Dwarf Nova, ER Ursae Majoris
| display-authors=1 | last1=Gao | first1=Weihong
| last2=Li | first2=Zongyun | last3=Wu | first3=Xiaoan
| last4=Zhang | first4=Zhousheng | last5=Li | first5=Yulan
| journal=The Astrophysical Journal
| volume=527 | issue=1 | pages=L55–L59
| date=December 1999 | doi=10.1086/312398
| pmid=10566998
| arxiv=astro-ph/9910558 | bibcode=1999ApJ...527L..55G | s2cid=16090638
}}

| display-authors=1 | last1=Szkody | first1=P.
| last2=Silber | first2=A. | last3=Honeycutt | first3=R. K.
| first4=D. W. | last4=Hoard | first5=L. | last5=Pastwick
| title=IUE and Optical Spectra of RZ LMi and ER UMa Throughout their 19 and 43 Day Cycles
| work=Cataclysmic variables and related objects. Proceedings of the 158th colloquium of the International Astronomical Union (IAU); held at Keele; United Kingdom; June 26-30; 1995
| series=Astrophysics and Space Science Library
| publication-place=Dordrecht
| publisher=Kluwer Academic Publishers
| editor1-first=A. | editor1-last=Evans
| editor2-first=Janet H. | editor2-last=Wood
| page=55 | year=1996 | volume=208
| bibcode=1996ASSL..208...55S
| doi=10.1007/978-94-009-0325-8_15 | isbn=978-94-010-6632-7
| s2cid=197532794
}}

| title=Photometric Detection of the Orbital Period in ER UMa
| display-authors=1 | last1=Kato | first1=Taichi
| last2=Masuda | first2=Seiji | last3=Nogami | first3=Daisaku
| journal=Information Bulletin on Variable Stars
| volume=4233 | page=1 | date=August 1995
| bibcode=1995IBVS.4233....1K }}

| title=A Model for a Peculiar SU Ursae Majoris-Type Dwarf Nova ER Ursae Majoris
| last=Osaki | first=Yoji
| journal=Publications of the Astronomical Society of Japan
| volume=47 | pages=L11–L14 | date=April 1995
| bibcode=1995PASJ...47L..11O }}

| title=RZ Leonis Minoris, PG 0943+521, and V1159 Orionis: Three Cataclysmic Variables with Similar and Unusual Outburst Behavior
| display-authors=1 | last1=Robertson | first1=J. W.
| last2=Honeycutt | first2=R. K. | last3=Turner | first3=G. W.
| journal=Publications of the Astronomical Society of the Pacific
| volume=107 | page=443 | date=May 1995
| doi=10.1086/133572 | bibcode=1995PASP..107..443R | s2cid=119609461
| doi-access=free }}