POSSIBLE
MILKY WAY
|
| Hen 4-204 | IRAS 22421-4508 | GSC2.4.2 SC0K000316 | AAVSO - |
| SIMBAD CD-45 14790 | Pan-STARRS - | SAO - | VSX 52926 |
| GAIA DR3 6519770495750980736 | SkyMapper 224501.39-445238.4 | WRAY - | GCVS - |
| 2MASS J22450141-4452383 | HIP - | Hen 4-204 | BD - |
| WISE J224501.40-445238.4 | TYC 8010-1309-1 | 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 (°) | 341.2559Ref | Parallax (mas) | 0.729±0.021Ref | Reddening E(B-V) (mag) | 0.01±0.0Ref, Note |
| Declination (°) | -44.8774Ref | Distance (kpc) | 1.32Ref, Note, 1.32Ref, Note | ||
| Galactic longitude (°) | 349.4013Ref | Proper motion in α (mas/yr) | 2.55±0.02Ref | ||
| Galactic latitude (°) | -59.1899Ref | Proper motion in δ (mas/yr) | -4.47±0.02Ref |
| X-Ray | - | IR type | S?Ref | Radio | - |
| X-Ray type | - | J (mag) | 6.26Ref | Flickering | - |
| GALEX FUV (mag) | 22.32Ref | H (mag) | 5.42Ref | Outbursts | - |
| GALEX NUV (mag) | 20.09Ref | K (mag) | 5.12Ref | Outburst type | - |
| IUE | NoRef | WISE W1 (mag) | 5.03Ref | Jets | - |
| FUSE | NoRef | WISE W2 (mag) | 5.08Ref | Resolved nebula | - |
| U (mag) | - | WISE W3 (mag) | 5.04Ref | IPmax (eV) | - |
| B (mag) | 11.41Ref | WISE W4 (mag) | 4.89Ref | [O III] lines | - |
| V (mag) | 9.74Ref | IRAS 12μm (Jy) | 0.39Ref | He II lines | - |
| R (mag) | - | IRAS 25μm (Jy) | 0.25Ref | [Fe VII] lines | - |
| I (mag) | - | IRAS 60μm (Jy) | 0.40Ref | O VI lines | - |
| BP (mag) | 10.03Ref | IRAS 100μm (Jy) | 1.00Ref | ||
| G (mag) | 8.82Ref | AKARI S09 (Jy) | 0.56Ref | ||
| RP (mag) | 7.74Ref | AKARI S18 (Jy) | 0.13Ref |
| Orbital period (days) | 510Ref | γ velocity (km/h) | -2.26±1.11Ref | 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 | S6Ref, SRef | Mass (M⊙) | 1.5Ref | Pulsation | Yes?Ref |
| Eff. temperature (K) | 3600Ref | Radius (R⊙) | - | Type | - |
| IR type | S?Ref | Luminosity (L⊙) | - | Pulsation period (days) | 19.12Ref |
| Metallicity [Fe/H] | -0.85Ref | Pulsation ephemeris | - |
| Type/Spectral type | WD?Ref | Mass (M⊙) | - | Spin period (min) | - |
| Shell-burning/Accreting-only | accreting-only?Ref | Radius (R⊙) | - | Accretion disk | - |
| Eff. temperature (K) | 10000Ref | Luminosity (L⊙) | - | ||
| Lower limit (K) | - | ||||
| Upper limit (K) | - |
Suspected in Vanture & Wallerstein (2003) based on its similarity to HD 35155, Hen 4-204 might be a yellow symbiotic star, according to their analysis. In Merc et al. (2021), optical spectra were analyzed, suggesting that the star closely resembles the known symbiotic binary BD Cam. The confirmation of the symbiotic status of Hen 4-204, however, awaits further UV observations.