POSSIBLE
MILKY WAY
|
| NGC 6881 | IRAS 20090+3715 | GSC2.4.2 N335496356 | AAVSO - |
| SIMBAD NGC 6881 | Pan-STARRS 152893027184654975 | SAO - | VSX - |
| GAIA DR3 - | SkyMapper - | WRAY - | GCVS - |
| 2MASS J20105244+3724424 | HIP - | Hen 2-456 | BD - |
| WISE - | TYC - | ESO - | HD - |
| Bidelman (1954) | - | Allen (1984) | - | Belzcyński et al. (2001) | - |
| Gaposchkin (1957) | - | Kenyon (1986) | - | Akras et al. (2019) | - |
| Boyarchuk (1969) | - | Vaidis (1988, 1991) | - |
| Right ascension (°) | 302.7185Ref | Parallax (mas) | - | Reddening E(B-V) (mag) | 1.76±0.09Ref, Note |
| Declination (°) | 37.4118Ref | Distance (kpc) | -, Note |
||
| Galactic longitude (°) | 74.5522Ref | Proper motion in α (mas/yr) | - | ||
| Galactic latitude (°) | 2.1139Ref | Proper motion in δ (mas/yr) | - |
| X-Ray | - | IR type | - | Radio | YesRef |
| X-Ray type | - | J (mag) | 12.34Ref | Flickering | - |
| GALEX FUV (mag) | - | H (mag) | 11.89Ref | Outbursts | - |
| GALEX NUV (mag) | - | K (mag) | 11.00Ref | Outburst type | - |
| IUE | YesRef | WISE W1 (mag) | - | Jets | - |
| FUSE | NoRef | WISE W2 (mag) | - | Resolved nebula | YesRef |
| U (mag) | - | WISE W3 (mag) | - | IPmax (eV) | 54.4Ref |
| B (mag) | - | WISE W4 (mag) | - | [O III] lines | YesRef |
| V (mag) | - | IRAS 12μm (Jy) | 2.78Ref | He II lines | YesRef |
| R (mag) | - | IRAS 25μm (Jy) | 19.30Ref | [Fe VII] lines | NoRef |
| I (mag) | - | IRAS 60μm (Jy) | 19.60Ref | O VI lines | NoRef |
| BP (mag) | - | IRAS 100μm (Jy) | 66.90Ref | ||
| G (mag) | - | AKARI S09 (Jy) | 0.97Ref | ||
| RP (mag) | - | AKARI S18 (Jy) | 9.37Ref |
| Orbital period (days) | - | γ velocity (km/h) | - | Size of giant’s orbit (AU) | - |
| Eccentricity | - | RV of giant (km/h) | - | Separation (AU) | - |
| Inclination (°) | - | Inferior conj. of giant (JD) | - | Mass function | - |
| Eclipses | - | Mass ratio | - | ||
| Orbital ephemeris | - |
| Spectral type | - | Mass (M⊙) | - | Pulsation | - |
| Eff. temperature (K) | - | Radius (R⊙) | - | Type | - |
| IR type | - | Luminosity (L⊙) | - | Pulsation period (days) | - |
| Metallicity [Fe/H] | - | Pulsation ephemeris | - |
| Type/Spectral type | - | Mass (M⊙) | - | Spin period (min) | - |
| Shell-burning/Accreting-only | shell-burning?Ref | Radius (R⊙) | - | Accretion disk | - |
| Eff. temperature (K) | - | Luminosity (L⊙) | - | ||
| Lower limit (K) | - | ||||
| Upper limit (K) | - |
Classified as a true planetary nebula in the HASH Database of PNe (Parker et al., 2016), but they noted the existance of highly collimated bipolar outflows and consequently, the central star is classified as a possible symbiotic star. The spectrum reveals strong Balmer lines, He I, He II, and [O III]. Various studies, such as those by Guerrero & Manchado (1998), Kwok & Su (2005), and Ramos-Larios et al. (2008), have discussed the complex structure of the outflows.