CONFIRMED
MILKY WAY
|
| V2905 Sgr | IRAS - | GSC2.4.2 S9TE000991 | AAVSO 000-BCB-857 |
| SIMBAD EM* AS 299 | Pan-STARRS 74202743345213872 | SAO - | VSX 30605 |
| GAIA DR3 4052142523831589504 | SkyMapper - | WRAY 16-401 | GCVS V2905 Sgr |
| 2MASS J18172027-2809491 | HIP - | Hen 3-1654 | BD - |
| WISE J181720.25-280949.5 | TYC - | ESO - | HD - |
| Bidelman (1954) | - | Allen (1984) | - | Belzcyński et al. (2001) | V2905 Sgr (Conf.) |
| Gaposchkin (1957) | - | Kenyon (1986) | - | Akras et al. (2019) | V2905 Sgr (Conf.) |
| Boyarchuk (1969) | - | Vaidis (1988, 1991) | V2905 Sgr (Susp.) |
| Right ascension (°) | 274.3345Ref | Parallax (mas) | 0.146±0.019Ref | Reddening E(B-V) (mag) | 0.28±0.01Ref, Note |
| Declination (°) | -28.1637Ref | Distance (kpc) | 2.4Ref 5.91Ref, Note, 5.92Ref, Note |
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| Galactic longitude (°) | 4.1143Ref | Proper motion in α (mas/yr) | -1.58±0.02Ref | ||
| Galactic latitude (°) | -5.6763Ref | Proper motion in δ (mas/yr) | -6.81±0.02Ref |
| X-Ray | NoRef | IR type | SRef | Radio | YesRef |
| X-Ray type | - | J (mag) | 9.23Ref | Flickering | - |
| GALEX FUV (mag) | - | H (mag) | 8.26Ref | Outbursts | YesRef |
| GALEX NUV (mag) | - | K (mag) | 8.00Ref | Outburst type | Z AndRef |
| IUE | NoRef | WISE W1 (mag) | 7.08Ref | Jets | - |
| FUSE | NoRef | WISE W2 (mag) | 7.32Ref | Resolved nebula | - |
| U (mag) | - | WISE W3 (mag) | 6.59Ref | IPmax (eV) | 54.4Ref, 63.5Ref |
| B (mag) | 12.85Ref | WISE W4 (mag) | 5.76Ref | [O III] lines | YesRef |
| V (mag) | 12.17Ref | IRAS 12μm (Jy) | - | He II lines | YesRef |
| R (mag) | - | IRAS 25μm (Jy) | - | [Fe VII] lines | NoRef |
| I (mag) | - | IRAS 60μm (Jy) | - | O VI lines | NoRef |
| BP (mag) | 12.47Ref | IRAS 100μm (Jy) | - | ||
| G (mag) | 11.65Ref | AKARI S09 (Jy) | - | ||
| RP (mag) | 10.69Ref | AKARI S18 (Jy) | - |
| Orbital period (days) | 508±9Ref | γ velocity (km/h) | -4.58±0.76Ref | 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 | Max (V) = 2451630 + 508±9 x ERef |
| Spectral type | M0Ref, M5Ref, M3Ref |
Mass (M⊙) | - | Pulsation | - |
| Eff. temperature (K) | 3600Ref | Radius (R⊙) | 139.6Ref | Type | - |
| IR type | SRef | Luminosity (L⊙) | - | Pulsation period (days) | - |
| Metallicity [Fe/H] | -1.03±0.07Ref | Pulsation ephemeris | - |
| Type/Spectral type | WDRef | Mass (M⊙) | - | Spin period (min) | - |
| Shell-burning/Accreting-only | shell-burningRef | Radius (R⊙) | - | Accretion disk | - |
| Eff. temperature (K) | - | Luminosity (L⊙) | 430Ref | ||
| Lower limit (K) | 54000Ref | ||||
| Upper limit (K) | 70000Ref |
Initially classified as a possible Be star by Sanduleak & Stephenson (1973), it was noted that TiO bands had been previously detected. Later, in Allen (1975), the star was classified as a probable VV Cephei-type. In Payne-Gaposchkin (1977), this target was listed among symbiotic binaries. The symbiotic nature was confirmed by Mikołajewska et al. (1997). The object exhibits periodic "outbursts" during periastron passage, as observed in Gromadzki et al. (2013).