CONFIRMED
MILKY WAY
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| CH Cyg | IRAS 19232+5008 | GSC2.4.2 N2J7000149 | AAVSO 000-BCG-667 |
| SIMBAD V* CH Cyg | Pan-STARRS 168292911373490413 | SAO 31632 | VSX 11029 |
| GAIA DR3 2130088038314195200 | SkyMapper - | WRAY - | GCVS CH Cyg |
| 2MASS J19243305+5014289 | HIP 95413 | Hen - | BD +49 2999 |
| WISE J192433.08+501428.9 | TYC 3551-2505-1 | ESO - | HD 182917 |
| Bidelman (1954) | - | Allen (1984) | CH Cyg (Susp.) | Belzcyński et al. (2001) | CH Cyg (Conf.) |
| Gaposchkin (1957) | - | Kenyon (1986) | CH Cyg (Conf.) | Akras et al. (2019) | CH Cyg (Conf.) |
| Boyarchuk (1969) | - | Vaidis (1988, 1991) | CH Cyg (Conf.) |
| Right ascension (°) | 291.1377Ref | Parallax (mas) | 4.882±0.086Ref | Reddening E(B-V) (mag) | 0.07±0.0Ref, Note |
| Declination (°) | 50.2414Ref | Distance (kpc) | 0.22±0.03Ref 0.20Ref, Note, 0.20Ref, Note |
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| Galactic longitude (°) | 81.8580Ref | Proper motion in α (mas/yr) | -5.95±0.10Ref | ||
| Galactic latitude (°) | 15.5799Ref | Proper motion in δ (mas/yr) | -13.79±0.11Ref |
| X-Ray | YesRef | IR type | SRef | Radio | YesRef |
| X-Ray type | β/δRef | J (mag) | 1.07Ref | Flickering | YesRef |
| GALEX FUV (mag) | - | H (mag) | 0.05Ref | Outbursts | YesRef |
| GALEX NUV (mag) | - | K (mag) | -0.42Ref | Outburst type | - |
| IUE | YesRef | WISE W1 (mag) | -1.02Ref | Jets | YesRef |
| FUSE | YesRef | WISE W2 (mag) | 1.77Ref | Resolved nebula | YesRef |
| U (mag) | 8.14Ref | WISE W3 (mag) | -2.92Ref | IPmax (eV) | 35.1Ref, 77.5 (UV)Ref |
| B (mag) | 8.77Ref | WISE W4 (mag) | -3.06Ref | [O III] lines | YesRef |
| V (mag) | 7.08Ref | IRAS 12μm (Jy) | 565.00Ref | He II lines | NoRef |
| R (mag) | - | IRAS 25μm (Jy) | 191.00Ref | [Fe VII] lines | NoRef |
| I (mag) | 5.35Ref | IRAS 60μm (Jy) | 18.20Ref | O VI lines | NoRef |
| BP (mag) | 7.90Ref | IRAS 100μm (Jy) | 4.27Ref | ||
| G (mag) | 5.37Ref | AKARI S09 (Jy) | 597.90Ref | ||
| RP (mag) | 3.98Ref | AKARI S18 (Jy) | 330.20Ref |
| Orbital period (days) | 5689.2±47Ref | γ velocity (km/h) | -59.91±0.09Ref, -59.41±0.84Ref | Size of giant’s orbit (AU) | 2.31Ref |
| Eccentricity | 0.122±0.024Ref | RV of giant (km/h) | 4.45±0.12Ref | Separation (AU) | 10.2Ref |
| Inclination (°) | 90Ref | Inferior conj. of giant (JD) | 2445681 | Mass function | 0.051Ref |
| Eclipses | YesRef | Mass ratio | 3.57Ref, 10.48Ref | ||
| Orbital ephemeris | T0 = 2446353±192 + 5689±47 x ERef |
| Spectral type | M6 IIIRef, M6.5 - M7 IIIRef, M7 IIIRef |
Mass (M⊙) | 2Ref, 2.2±0.1Ref | Pulsation | YesRef |
| Eff. temperature (K) | 2700Ref, 3100Ref, 3100Ref |
Radius (R⊙) | 288±15Ref, 370Ref, 280Ref |
Type | g-mode non-radialRef |
| IR type | SRef | Luminosity (L⊙) | 5600Ref, 5000Ref | Pulsation period (days) | 101.32±0.5Ref, 750.1±1.3Ref |
| Metallicity [Fe/H] | 0±0.19Ref, 0.13±0.09Ref | Pulsation ephemeris | - |
| Type/Spectral type | WDRef | Mass (M⊙) | 0.56Ref, 0.21±0.01Ref | Spin period (min) | - |
| Shell-burning/Accreting-only | accreting-onlyRef | Radius (R⊙) | - | Accretion disk | - |
| Eff. temperature (K) | 80000-85000Ref, 14200Ref | Luminosity (L⊙) | 0.3-13Ref, 0.25Ref, 5-10Ref |
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| Lower limit (K) | - | ||||
| Upper limit (K) | - |
Not recognized as a symbiotic system until its 1964 outburst (see the discussion in Kenyon, 1986). It was previously classified as an SRa M6 star (Smak, 1964). The system is suggested to be a triple star due to the detection of two/three periods in the light curves and radial velocity curves. A period of around 100 days was proposed to be associated with red giant pulsations, while for the other two periods (750 days and 15 years), two models exist. In one model, the giant pulsates with a period of 750 days, and the 15-year period is the orbital one. In the other model, the system consists of an inner symbiotic binary with a 750-day orbital period and an outer third component with an orbital period of 15 years (likely a G-type dwarf); see, e.g., Hinkle et al. (2009), Iijima et al. (2019), and references therein.