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Latest Details
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Name
  FO Aqr  
AAVSO UID
000-BJN-855 (341577 observations)  
Constellation
Aquarius Sequence
J2000.0
22 17 55.38 -08 21 03.8  (334.48075 -8.35106) Search nearby
B1950.0 22 15 17.30 -08 36 05.9
Proper motion
RA: 4.1 +/- 6.2 mas/yDec: 1.6 +/- 2.9 mas/ySource: UCAC4
Galactic coord. 53.000 -49.158
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J221753.9-082115 2MASS J22175538-0821038 AAVSO 2212-08
ASASSN-V J221755.39-082103.7 Downes FO Aqr GSC 05804-00775
X 22153-086 ZTF18abxehba  
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Variability type
DQ+E
Spectral type WD+M2/4e
Mag. range
12.7 - 15.7 V
Discoverer F. E. Marshall et al.
Epoch
27 Jun 1981 (HJD 2444782.863) Ephemeris
Outburst --
Period 0.20205999 d  (4.849440 h)
Rise/eclipse dur. --
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 Otero, Sebastian Alberto Only the outer edge of the accretion disc is being eclipsed (2016MNRAS.459.3622K).
2 Otero, Sebastian Alberto White dwarf spěn period 1254.48379 s. (2016IBVS.6181....1B).
3 Otero, Sebastian Alberto Faint state around May, 2016.
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References
Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Garnavich, P.; Tweddale, J.; Littlefield, C., 2025, A Refined Orbital
Ephemeris for the Intermediate Polar FO Aquarii and Evidence for a Period
Derivative		 2025RNAAS...9..259G
2 Kennedy, M. R.; Garnavich, P. M.; Littlefield, C.; et al., 2020, Optical
spectra of FO Aquarii during low and high accretion rates		 2020MNRAS.495.4445K
3 Gaia Collaboration; et al., 2018, Gaia Data Release 2. Summary of the
contents and survey properties		 2018A&A...616A...1G
4 Kennedy, M. R.; Garnavich, P.; Breedt, E.; et al., 2016, Kepler K2
observations of the intermediate polar FO Aquarii		 2016MNRAS.459.3622K
5 Bonnardeau, M., 2016, IBVS #6181 2016IBVS.6181....1B
6 S. Scaringi et al., 2009, arXiv:0910.0954v1 [astro-ph.GA] 2009arXiv0910.0954S
7 Light curve from CRTS/CSS (Drake et al. 2009, ApJ, 696, 870) 2009ApJ...696..870D
8 R.A.Downes, 2001, PASP 113, 764 (2006 archival) 2005JAD....11....2D
9 J.M. Kreiner, 2004, Acta Astronomica 54, 207 2004AcA....54..207K
10 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
11 J.Patterson, J.E.Steiner, ApJ 264,L61,1983. 1983ApJ...264L..61P
External Links
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 12.87H = 12.74K = 12.51J - K = 0.36
AllWISE W1 = 12.46W2 = 12.22W3 = 11.64W1 - W2 = 0.24
APASS-DR9 B = 13.70V = 13.56g' = 13.53r' = 13.56i' = 13.72B - V = 0.14
SDSS-DR12 u = 14.30g = 13.53r = 13.46i = 13.52z = 13.73u - g = 0.77r - i = -0.07
Images
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Supporting Documents
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Revision History
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10 Otero, Sebastian Alberto 2026-03-12 15:12 UTC Period and epoch from 2025RNAAS...9..259G.
9 Otero, Sebastian Alberto 2025-09-17 17:03 UTC Period, spectral type and discoverer from 2020MNRAS.495.4445K.
8 Otero, Sebastian Alberto 2020-05-15 00:52 UTC Gaia DR2 position.
7 Otero, Sebastian Alberto 2018-04-27 19:23 UTC Periods and epoch from 2016IBVS.6181....1B.
6 Otero, Sebastian Alberto 2016-07-07 21:05 UTC Minimum magnitude from AAVSO V data.
5 Otero, Sebastian Alberto 2011-05-25 01:14 UTC Primary record creation. Type from Downes (2001). UCAC3 position.
4 Admin, VSX 2010-01-05 04:43 UTC Update from the GCVS version of November 2009.
3 Admin, VSX 2009-10-30 01:29 UTC Update from [2004AcA....54..207K].
2 Admin, VSX 2009-10-09 02:29 UTC Orbital period from [2009arXiv0910.0954S].
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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