Alessi 20
(FoF 2409; OCSN 141)
Summary
Alessi 20 is a rich, very dense object of very high C3 quality. It is located at a very close distance from the Sun, near the mid-plane. It is very well-studied in the literature.
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Dias et al. (2002) | 2.642 | 58.76 | – | 8.73 | -3.11 | -11.5 |
| Piskunov et al. (2007) | 2.637 | 58.761 | – | – | – | – |
| Piskunov et al. (2008) | 2.637 | 58.761 | – | – | – | – |
| Kharchenko et al. (2012) | 2.667 | 58.748 | – | 6.34 | -2.51 | – |
| Loktin & Popova (2017) | 2.64 | 58.76 | – | 8.73 | -3.11 | -11.5 |
| Cantat-Gaudin et al. (2018) | 2.593 | 58.742 | 2.311 | 8.195 | -2.341 | – |
| Soubiran et al. (2018) | 2.593 | 58.742 | – | – | – | -5.04 |
| Dias et al. (2019) | 2.592 | 58.742 | 2.311 | 8.195 | -2.341 | -4.314 |
| Liu & Pang (2019) | 2.401 | 58.664 | 2.308 | 8.152 | -2.404 | – |
| Cantat-Gaudin et al. (2020) | 2.593 | 58.742 | 2.311 | 8.195 | -2.341 | – |
| Dias et al. (2021) | 2.591 | 58.741 | 2.315 | 8.168 | -2.365 | -4.979 |
| He et al. (2022) | 1.905 | 58.624 | 2.333 | 8.019 | -2.471 | – |
| Qin et al. (2023) | 2.64 | 58.77 | 2.33 | 8.12 | -2.42 | -10.04 |
| Hunt & Reffert (2023) | 2.643 | 58.757 | 2.343 | 8.117 | -2.427 | -9.305 |
| Cavallo et al. (2024) | 2.261 | 58.664 | 2.336 | – | – | – |
| Celli et al. (2024) | 2.593 | 58.742 | – | – | – | – |
| Hunt & Reffert (2024) | 2.643 | 58.757 | 2.343 | 8.117 | -2.427 | -9.305 |
| Alfonso et al. (2024) | 2.541 | 58.706 | 2.294 | 8.114 | -2.456 | – |
| Almeida et al. (2025) | 2.591 | 58.741 | – | – | – | – |
| UCC | 2.541 | 58.71 | 2.329 | 8.135 | -2.429 | -10.208 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Dias et al. (2002) | E(B-V)=0.22, Dist=600.0, Age=6.48 |
| Piskunov et al. (2007) | E(B-V)=0.22, Dist=450, logt=8.22, logM=1.152 |
| Piskunov et al. (2008) | E(B-V)=0.22, Dist=450, logt=8.22, logM=1.742, logMA=1.362 |
| Kharchenko et al. (2012) | e_bv=0.381, distance=470, log_age=7.575 |
| Loktin & Popova (2017) | E(B-V)=0.22, Dist=567, logt=6.48 |
| Cantat-Gaudin et al. (2018) | dmode=427.3 |
| Soubiran et al. (2018) | dmode=427.3 |
| Dias et al. (2019) | E(B-V)=0.26, Dist=436, logAge=6.975, Z=0.01 |
| Liu & Pang (2019) | Age=0.009, Z=-0.5 |
| Cantat-Gaudin et al. (2020) | AVNN=0.6, DistPc=412.0, AgeNN=6.97 |
| Dias et al. (2021) | Av=1.002, Dist=423, logage=6.991, [Fe/H]=-0.104 |
| He et al. (2022) | A0=1.05, logAge=7.05 |
| Qin et al. (2023) | E(B-V)=0.32, m-M=9.05, logt=6.95 |
| Hunt & Reffert (2023) | AV50=0.647, diffAV50=1.508, MOD50=8.068, logAge50=6.826 |
| Cavallo et al. (2024) | AV50=1.47, dMod50=8.19, logAge50=6.72, [Fe/H]50=-0.16 |
| Celli et al. (2024) | Age=9.3, Mc=130.5 |
| Hunt & Reffert (2024) | MassJ=192.484, MassTot=204.712 |
| Alfonso et al. (2024) | AV=0.59533, MOD=8.04379, logAge=7.20021, Z=-0.1034 |
| Almeida et al. (2025) | AV=1.002, Dist=423, logAge=6.991, MassRk=150.0 |
Search coordinates in Bayestar19