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Version from February 3, 2024

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 1973Ref
Confirmed 1978Ref
Symbiotic IR type SRef
Hot component type shell-burningRef
Outbursts -
17 34 17.214 -19 09 22.87
FoV: 2.99'

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

Observations

X-Ray NoRef IR type SRef Radio YesRef
X-Ray type - J (mag) 8.66Ref Flickering -
GALEX FUV (mag) - H (mag) 7.60Ref Outbursts -
GALEX NUV (mag) - K (mag) 7.10Ref Outburst type -
IUE NoRef WISE W1 (mag) 6.85Ref Jets -
FUSE NoRef WISE W2 (mag) 6.89Ref Resolved nebula NoRef
U (mag) - WISE W3 (mag) 6.42Ref IPmax (eV) 114Ref
B (mag) 15.18Ref WISE W4 (mag) 5.74Ref [O III] lines YesRef
V (mag) 14.12Ref IRAS 12μm (Jy) - He II lines YesRef
R (mag) - IRAS 25μm (Jy) - [Fe VII] lines YesRef
I (mag) - IRAS 60μm (Jy) - O VI lines YesRef
BP (mag) 14.45Ref IRAS 100μm (Jy) -
G (mag) 12.75Ref AKARI S09 (Jy) 0.14Ref
RP (mag) 11.39Ref AKARI S18 (Jy) -

Orbit

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

Cool component

Spectral type M2 IIIRef, M1 IIIRef,
M6 IIIRef
Mass (M) 1.2Ref Pulsation -
Eff. temperature (K) 3300Ref Radius (R) 137±15Ref Type -
IR type SRef Luminosity (L) 2200Ref Pulsation period (days) -
Metallicity [Fe/H] 0.16±0.09Ref     Pulsation ephemeris -

Hot component

Type/Spectral type WDRef Mass (M) - Spin period (min) -
Shell-burning/Accreting-only shell-burningRef Radius (R) - Accretion disk -
Eff. temperature (K) - Luminosity (L) 700Ref    
Lower limit (K) 114000Ref        
Upper limit (K) -        

Links

SIMBAD   CDS Portal   ARAS Database


Notes

 


References


Last updated: April 17, 2022