| Star name | Status | Suspected (Year) | Confirmed (Year) | Right ascension (°) | Declination (°) | V (mag) | Gaia G (mag) | Shell-burning/Accreting-only |
|---|---|---|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | 2015 | - | 10.0333 | 41.7567 | 24.85 | - | shell-burning? |
| NGC 205 SySt-1 | Confirmed | 2015 | 2015 | 10.0728 | 41.6987 | - | 20.89 | shell-burning |
| NGC 205 SySt-3 | Possible | 2015 | - | 10.0871 | 41.6950 | 23.47 | - | shell-burning? |
| Star name | Status | SIMBAD | Gaia DR3 | 2MASS | WISE | Pan-STARRS | SkyMapper | VSX | GCVS |
|---|---|---|---|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | [MMD2006] 2647 | - | - | - | - | - | - | - |
| NGC 205 SySt-1 | Confirmed | NAME NGC 205 SySt-1 | 381346474020884736 | 00401748+4141508 | - | 158030100726478927 | - | - | - |
| NGC 205 SySt-3 | Possible | [MMD2006] 2641 | - | - | - | 158030100870164467 | - | - | - |
| Star name | Status | Bidelman (1954) | Gaposchkin (1957) | Boyarchuk (1969) | Allen (1984) | Kenyon (1986) | Vaidis (1988, 1991) | Belzcyński et al. (2001) | Akras et al. (2019) |
|---|---|---|---|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | - | - | - | - | - | - | - | NGC 205 SySt-2 |
| NGC 205 SySt-1 | Confirmed | - | - | - | - | - | - | - | NGC 205 SySt-1 |
| NGC 205 SySt-3 | Possible | - | - | - | - | - | - | - | NGC 205 SySt-3 |
| Star name | Status | Right ascension (HH MM SS.s) | Declination (DD MM SS.s) | Distance (kpc) | Reddening E(B-V) (mag) |
|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | 00 40 07.999 | +41 45 24.192 | 824 | 0.06 |
| NGC 205 SySt-1 | Confirmed | 00 40 17.464 | +41 41 55.319 | 824 | 0.07 |
| NGC 205 SySt-3 | Possible | 00 40 20.899 | +41 41 41.892 | 824 | 0.07 |
| Star name | Status | B (mag) | V (mag) | R (mag) | I (mag) | Gaia G (mag) | IR type | J (mag) | H (mag) | K (mag) | Flickering | Outbursts | Outburst type | IPmax (eV) | [O III] lines | He II lines | [Fe VII] lines | O VI lines |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | - | 24.85 | - | - | - | - | - | - | - | - | - | - | 54.9 | Yes | Yes | No | No |
| NGC 205 SySt-1 | Confirmed | - | - | - | - | 20.89 | - | - | - | - | - | - | - | 114 | Yes | Yes | Yes | Yes |
| NGC 205 SySt-3 | Possible | - | 23.47 | - | - | - | - | - | - | - | - | - | - | 54.9 | Yes | Yes | No | No |
| Star name | Status | Orbital period (days) | Eccentricity | Eclipses | γ velocity (km/h) | Mass ratio |
|---|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | - | - | - | - | - |
| NGC 205 SySt-1 | Confirmed | - | - | - | - | - |
| NGC 205 SySt-3 | Possible | - | - | - | - | - |
| Star name | Status | Spectral type of the giant | Effective temperature of the giant (K) | Luminosity of the giant (L⊙) | Pulsations | Pulsation period (days) |
|---|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | K5-M2 | - | - | - | - |
| NGC 205 SySt-1 | Confirmed | M2 III | 2800 | - | - | - |
| NGC 205 SySt-3 | Possible | K5-M2 | - | - | - | - |
| Star name | Status | Hot component type | Shell-burning/Accreting-only | Effective temperature of the hot component (K) | Luminosity of the hot component (L⊙) |
|---|---|---|---|---|---|
| NGC 205 SySt-2 | Possible | - | shell-burning? | 340000 | - |
| NGC 205 SySt-1 | Confirmed | - | shell-burning | 340000 | - |
| NGC 205 SySt-3 | Possible | - | shell-burning? | 270000 | - |