SUSPECTED
MILKY WAY
|
| V1988 Sgr | IRAS 18248-2739 | GSC2.4.2 S9T4000018 | AAVSO 000-BCC-386 |
| SIMBAD V* V1988 Sgr | Pan-STARRS 74852769887762809 | SAO - | VSX 29688 |
| GAIA DR3 4051676816353066112 | SkyMapper 182757.32-273722.7 | WRAY - | GCVS V1988 Sgr |
| 2MASS J18275731-2737226 | HIP - | Hen - | BD - |
| WISE J182757.29-273723.0 | TYC - | ESO - | HD - |
| Bidelman (1954) | - | Allen (1984) | - | Belzcyński et al. (2001) | - |
| Gaposchkin (1957) | - | Kenyon (1986) | V1988 Sgr (Susp.) | Akras et al. (2019) | - |
| Boyarchuk (1969) | - | Vaidis (1988, 1991) | V1988 Sgr (Conf.) |
| Right ascension (°) | 276.9888Ref | Parallax (mas) | 1.387±0.142Ref | Reddening E(B-V) (mag) | 0.34±0.01Ref, Note |
| Declination (°) | -27.6231Ref | Distance (kpc) | 0.73Ref, Note, 0.69Ref, Note | ||
| Galactic longitude (°) | 5.6802Ref | Proper motion in α (mas/yr) | -4.21±0.11Ref | ||
| Galactic latitude (°) | -7.5137Ref | Proper motion in δ (mas/yr) | -13.92±0.09Ref |
| X-Ray | NoRef | IR type | S?Ref | Radio | - |
| X-Ray type | - | J (mag) | 3.93Ref | Flickering | - |
| GALEX FUV (mag) | - | H (mag) | 2.79Ref | Outbursts | Yes?Ref |
| GALEX NUV (mag) | - | K (mag) | 2.35Ref | Outburst type | - |
| IUE | NoRef | WISE W1 (mag) | 1.10Ref | Jets | - |
| FUSE | NoRef | WISE W2 (mag) | 0.90Ref | Resolved nebula | - |
| U (mag) | - | WISE W3 (mag) | 1.24Ref | IPmax (eV) | No linesRef |
| B (mag) | - | WISE W4 (mag) | 0.68Ref | [O III] lines | NoRef |
| V (mag) | 12.50Ref | IRAS 12μm (Jy) | 9.66Ref | He II lines | NoRef |
| R (mag) | - | IRAS 25μm (Jy) | 3.91Ref | [Fe VII] lines | NoRef |
| I (mag) | - | IRAS 60μm (Jy) | 0.94Ref | O VI lines | NoRef |
| BP (mag) | 12.73Ref | IRAS 100μm (Jy) | 16.00Ref | ||
| G (mag) | 9.24Ref | AKARI S09 (Jy) | 9.57Ref | ||
| RP (mag) | 7.72Ref | AKARI S18 (Jy) | 4.97Ref |
| Orbital period (days) | 3125?Ref | γ velocity (km/h) | -25.33±0.78Ref | 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 | M7Ref, M6.5Ref | Mass (M⊙) | - | Pulsation | YesRef |
| Eff. temperature (K) | 3100Ref | Radius (R⊙) | - | Type | SRRef |
| IR type | S?Ref | Luminosity (L⊙) | - | Pulsation period (days) | 93.46Ref |
| Metallicity [Fe/H] | - | Pulsation ephemeris | - |
| Type/Spectral type | - | Mass (M⊙) | - | Spin period (min) | - |
| Shell-burning/Accreting-only | accreting-only?Ref | Radius (R⊙) | - | Accretion disk | - |
| Eff. temperature (K) | - | Luminosity (L⊙) | - | ||
| Lower limit (K) | - | ||||
| Upper limit (K) | - |
The star is listed as a confirmed symbiotic star in SIMBAD (Wenger et al., 2000) and ZAND: in the GCVS. It is also labeled as a suspected symbiotic star in Kenyon (1986). The star was observed in a brightening phase by Hoffleit (1962). However, a detailed analysis of the object by Merc et al. (2021) rejected the classification of the object as a shell-burning symbiotic star, as its spectrum revealed no emission lines in addition to M6.5III continuum. Although they suggested that the object might still be an accreting-only symbiotic star, there is currently no evidence supporting this hypothesis in the available data.