CONFIRMED
MILKY WAY
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| V1329 Cyg | IRAS Z20490+3523 | GSC2.4.2 N35M001648 | AAVSO 000-BCM-636 |
| SIMBAD V* V1329 Cyg | Pan-STARRS 150693127551368632 | SAO - | VSX 12249 |
| GAIA DR3 1869918087965179520 | SkyMapper - | WRAY - | GCVS V1329 Cyg |
| 2MASS J20510123+3534539 | HIP - | Hen - | BD - |
| WISE J205101.22+353454.0 | TYC - | ESO - | HD - |
| Bidelman (1954) | - | Allen (1984) | V1329 Cyg (Conf.) | Belzcyński et al. (2001) | V1329 Cyg (Conf.) |
| Gaposchkin (1957) | - | Kenyon (1986) | V1329 Cyg (Conf.) | Akras et al. (2019) | V1329 Cyg (Conf.) |
| Boyarchuk (1969) | - | Vaidis (1988, 1991) | V1329 Cyg (Conf.) |
| Right ascension (°) | 312.7551Ref | Parallax (mas) | 0.185±0.027Ref | Reddening E(B-V) (mag) | 0.35±0.01Ref, Note |
| Declination (°) | 35.5817Ref | Distance (kpc) | 3.5Ref, 6Ref, 4.8Ref, 4.2Ref 4.94Ref, Note, 5.02Ref, Note |
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| Galactic longitude (°) | 77.8351Ref | Proper motion in α (mas/yr) | -3.93±0.03Ref | ||
| Galactic latitude (°) | -5.4770Ref | Proper motion in δ (mas/yr) | -4.47±0.03Ref |
| X-Ray | YesRef | IR type | SRef | Radio | YesRef |
| X-Ray type | βRef | J (mag) | 8.17Ref | Flickering | NoRef |
| GALEX FUV (mag) | - | H (mag) | 7.19Ref | Outbursts | YesRef |
| GALEX NUV (mag) | - | K (mag) | 6.75Ref | Outburst type | SyNRef |
| IUE | NoRef | WISE W1 (mag) | 6.64Ref | Jets | YesRef |
| FUSE | YesRef | WISE W2 (mag) | 6.64Ref | Resolved nebula | YesRef |
| U (mag) | - | WISE W3 (mag) | 6.25Ref | IPmax (eV) | 114Ref, 233.6Ref |
| B (mag) | 13.82Ref | WISE W4 (mag) | 5.59Ref | [O III] lines | YesRef |
| V (mag) | 13.14Ref | 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) | 13.42Ref | IRAS 100μm (Jy) | - | ||
| G (mag) | 12.09Ref | AKARI S09 (Jy) | 0.22Ref | ||
| RP (mag) | 10.79Ref | AKARI S18 (Jy) | - |
| Orbital period (days) | 956.5Ref | γ velocity (km/h) | -23.06±0.19Ref | Size of giant’s orbit (AU) | 0.69Ref |
| Eccentricity | 0Ref | RV of giant (km/h) | 7.85±0.26Ref | Separation (AU) | - |
| Inclination (°) | 86±2Ref | Inferior conj. of giant (JD) | 2451804.1 | Mass function | 0.0481Ref |
| Eclipses | YesRef | Mass ratio | 2.9Ref | ||
| Orbital ephemeris | Min (B) = 2444890 + 956.5 x ERef |
| Spectral type | M5 IIIRef, M6-7 IIIRef, M6 IIIRef |
Mass (M⊙) | 2.1Ref, 2.2Ref | Pulsation | - |
| Eff. temperature (K) | 3500Ref, 3300Ref | Radius (R⊙) | 132±40Ref | Type | - |
| IR type | SRef | Luminosity (L⊙) | 1900Ref | Pulsation period (days) | - |
| Metallicity [Fe/H] | 0.12±0.09Ref | Pulsation ephemeris | - |
| Type/Spectral type | WDRef | Mass (M⊙) | 0.65Ref, 0.75Ref | Spin period (min) | - |
| Shell-burning/Accreting-only | shell-burningRef | Radius (R⊙) | - | Accretion disk | - |
| Eff. temperature (K) | 160000Ref, 145000Ref | Luminosity (L⊙) | - | ||
| Lower limit (K) | - | ||||
| Upper limit (K) | - |
Discovered by Kohoutek (1969) as a peculiar emission object in a strong outburst, similar to V1016 Cyg, this star's light curve was documented in Crampton et al. (1970), Stienon et al. (1974), and Munari et al. (1988). The orbital period underwent changes due to the outburst, as reported by Hric et al. (1993). Initially considered to consist of a very massive cool component, this hypothesis was later contradicted by Ikeda & Tamura (2000). In 2004, another small-scale eruption was detected by Pribulla et al. (2004), a phenomenon also reported by Arkhipova et al. (2015). The latter study additionally reported the detection of [Fe X] emission.