RS Oph

Constellation
Ophiucus

Equatorial coordinates
α = 17 50 13.161
δ = -06 42 28.576

Galactic coordinates
l = 19.7994°
b = 10.3722°

Suspected	1933^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	Yes^Ref - SyRN^Ref

Identifiers

RS Oph	IRAS 17474-0641	GSC2.4.2 S7XO000203	AAVSO 000-BBZ-452
SIMBAD V* RS Oph	Pan-STARRS 99952675552450913	SAO -	VSX 20497
GAIA DR3 4174878674679897344	SkyMapper 175013.16-064228.4	WRAY -	GCVS RS Oph
2MASS J17501316-0642284	HIP -	Hen -	BD -06 4661
WISE J175013.15-064228.5	TYC 5094-550-1	ESO -	HD 162214

Symbiotic Catalogs

Bidelman (1954)	RS Oph (Conf.)	Allen (1984)	RS Oph (Conf.)	Belzcyński et al. (2001)	RS Oph (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	RS Oph (Conf.)	Akras et al. (2019)	RS Oph (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	RS Oph (Conf.)

Position

Right ascension (°)	267.5548^Ref	Parallax (mas)	0.373±0.023^Ref	Reddening E(B-V) (mag)	0.64±0.03^Ref ^{, Note}
Declination (°)	-6.7079^Ref	Distance (kpc)	1.4^Ref, 2.45±0.4^Ref 2.40^Ref ^{, Note}, 2.44^Ref ^{, Note}
Galactic longitude (°)	19.7994^Ref	Proper motion in α (mas/yr)	1.30±0.02^Ref
Galactic latitude (°)	10.3722^Ref	Proper motion in δ (mas/yr)	-5.97±0.02^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	7.64^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	16.31^Ref	H (mag)	6.86^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	15.88^Ref	K (mag)	6.50^Ref	Outburst type	SyRN^Ref
IUE	Yes^Ref	WISE W1 (mag)	6.18^Ref	Jets	Yes^Ref
FUSE	No^Ref	WISE W2 (mag)	5.94^Ref	Resolved nebula	Yes^Ref
U (mag)	-	WISE W3 (mag)	5.16^Ref	IPmax (eV)	361^Ref
B (mag)	12.24^Ref	WISE W4 (mag)	4.34^Ref	[O III] lines	Yes^Ref
V (mag)	11.07^Ref	IRAS 12μm (Jy)	0.42^Ref	He II lines	Yes^Ref
R (mag)	11.23^Ref	IRAS 25μm (Jy)	0.31^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	Yes^Ref
BP (mag)	11.44^Ref	IRAS 100μm (Jy)	2.79^Ref
G (mag)	10.43^Ref	AKARI S09 (Jy)	-
RP (mag)	9.38^Ref	AKARI S18 (Jy)	0.23^Ref

Orbit

Orbital period (days)	455.72±0.83^Ref, 453.6±0.4^Ref	γ velocity (km/h)	-40.22±0.64^Ref, -39.5±0.4^Ref	Size of giant’s orbit (AU)	0.70^Ref, 0.73^Ref
Eccentricity	0±-^Ref	RV of giant (km/h)	16.71±0.97^Ref, 17.5±0.6^Ref	Separation (AU)	-
Inclination (°)	49-52^Ref, 39^Ref	Inferior conj. of giant (JD)	2445156.94	Mass function	0.221^Ref, 0.25^Ref
Eclipses	-			Mass ratio	0.59^Ref
Orbital ephemeris	Min (V) = 2451848 + 453.6±0.4 x E^Ref

Cool component

Spectral type	K5.7 III^Ref, K7 III^Ref, M0 III^Ref	Mass (M_⊙)	0.68-0.80^Ref	Pulsation	-
Eff. temperature (K)	4100±100^Ref, 4200±200^Ref, 3800-4000^Ref	Radius (R_⊙)	55-61^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	690±95^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	0±0.5^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	1.35-1.37^Ref, 1.35^Ref, 1.2-1.4^Ref, 1.31^Ref, 1.35^Ref	Spin period (min)	-
Shell-burning/Accreting-only	accreting-only^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	100-600^Ref, 190^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Discovered in its nova outburst in 1898 (Pickering, 1905), RS Oph has been the subject of extensive study. The evolution of optical spectra during its two latest outbursts is detailed in works such as Mondal et al. (2018), Munari & Valisa (2021), and Munari & Valisa (2022). The system is identified to contain a massive carbon-oxygen WD, as described in Mikołajewska & Shara (2017).

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