M 1-21

CONFIRMED MILKY WAY

Constellation
Ophiucus

Equatorial coordinates
α = 17 34 17.214
δ = -19 09 22.867

Galactic coordinates
l = 6.9600°
b = 7.3579°

Suspected	1973^Ref
Confirmed	1978^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

M 1-21	IRAS 17313-1909	GSC2.4.2 S8L6017470	AAVSO 000-BJT-537
SIMBAD Hen 2-247	Pan-STARRS 85012635717742731	SAO -	VSX 239257
GAIA DR3 4121623962125563776	SkyMapper 173417.22-190922.9	WRAY -	GCVS -
2MASS J17341721-1909229	HIP -	Hen 2-247	BD -
WISE J173417.21-190922.9	TYC -	ESO 588-7	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	M1-21 (Conf.)	Belzcyński et al. (2001)	M 1-21 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	M1-21 (Conf.)	Akras et al. (2019)	M 1-21 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	M-1-21 (Conf.)

Position

Right ascension (°)	263.5717^Ref	Parallax (mas)	-0.019±0.054^Ref	Reddening E(B-V) (mag)	0.6±0.01^Ref ^{, Note}
Declination (°)	-19.1564^Ref	Distance (kpc)	2.4^Ref, 4.7^Ref 8.99^Ref ^{, Note}, 5.50^Ref ^{, Note}
Galactic longitude (°)	6.9600^Ref	Proper motion in α (mas/yr)	-4.00±0.04^Ref
Galactic latitude (°)	7.3579^Ref	Proper motion in δ (mas/yr)	-3.79±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	8.66^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	7.60^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.10^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.85^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	6.89^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	6.42^Ref	IPmax (eV)	114^Ref
B (mag)	15.18^Ref	WISE W4 (mag)	5.74^Ref	[O III] lines	Yes^Ref
V (mag)	14.12^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	Yes^Ref
BP (mag)	14.45^Ref	IRAS 100μm (Jy)	-
G (mag)	12.75^Ref	AKARI S09 (Jy)	0.14^Ref
RP (mag)	11.39^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	892±40^Ref, 898.0±4.7^Ref	γ velocity (km/h)	89.54±0.27^Ref	Size of giant’s orbit (AU)	0.73^Ref
Eccentricity	0^Ref, 0.165±0.040^Ref	RV of giant (km/h)	9±0.38^Ref	Separation (AU)	-
Inclination (°)	95.8±5^Ref, 96.7±7.1^Ref	Inferior conj. of giant (JD)	2452645.1	Mass function	0.0652^Ref
Eclipses	Yes?^Ref			Mass ratio	1.5^Ref
Orbital ephemeris	-

Cool component

Spectral type	M2 III^Ref, M1 III^Ref, M6 III^Ref	Mass (M_⊙)	1.2^Ref	Pulsation	-
Eff. temperature (K)	3300^Ref	Radius (R_⊙)	137±15^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	2200^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	0.16±0.09^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	700^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

References

Allen, D. A., 1978, MNRAS, 184, 601, 1978MNRAS.184..601A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Fekel, F. C., Hinkle, K. H., Joyce, R. R. et al., 2008, AJ, 136, 1, 146, 2008AJ....136..146F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2016, MNRAS, 455, 2, 1282, 2016MNRAS.455.1282G
Harries, T. J., Howarth, I. D., 2000, A&A, 361, 139, 2000A&A...361..139H
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Sanduleak, N., Stephenson, C. B., 1973, ApJ, 185, 899, 1973ApJ...185..899S
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S

Last updated: April 17, 2022