Alessi 55
(FSR 1080; MWSC 1038)
0.20
UTI
0.0
CN
0.14
Cdens
0.12
CC3
0.38
Clit
1.0
Cdup
Radius (P>50% members)
6.5 [arcmin]
- CN 0.0 Sparse
- Cdens 0.14 Very loose
- CC3 0.12 Very low quality
- Clit 0.38 Poorly studied
- Cdup 1.0 Unique
Overview
Alessi 55 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate* distance, above the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature.
(*): The parallax distance estimate (~2.65 kpc) differs significantly from the median photometric distance (~1.75 kpc).
Relatively close
Moderate extinction
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | – | 104.546 | 0.88 | 0.378 | -1.052 | 1.973 | – |
| Just et al. | 2023 | 104.558 | 0.885 | – | – | – | – |
| Bica et al. | 2019 | 104.572 | 0.868 | – | – | – | – |
| Kharchenko et al. | 2016 | 104.558 | 0.885 | – | – | – | – |
| Kharchenko et al. | 2013 | 104.565 | 0.884 | – | -1.99 | -4.54 | – |
| Froebrich et al. | 2007 | 104.567 | 0.865 | – | – | – | – |
| Dias et al. | 2002 | 104.567 | 0.865 | – | -1.99 | -4.54 | – |
💡 Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Just et al. | 2023 | – | – | – | 234 | – | 104 | – | – |
| Kharchenko et al. | 2016 | 1.75 | 1.74 | – | 234 | – | – | – | – |
| Kharchenko et al. | 2013 | 1.75 | 1.74 | – | 234 | – | – | – | – |
| Dias et al. | 2002 | 1.75 | 1.74 | – | 234 | – | – | – | – |
💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
