Alessi 2
(LeDrew 4; MWSC 419)
Summary
Alessi 2 is a rich, very dense object of very high C3 quality. It is located at a close distance from the Sun, above the mid-plane. It is very well-studied in the literature.
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Dias et al. (2002) | 71.508 | 55.207 | – | 0.25 | -1.09 | – |
| Alessi et al. (2003) | 71.6 | 55.25 | – | 0.2 | -1.1 | – |
| Piskunov et al. (2007) | 71.548 | 55.228 | – | – | – | – |
| Piskunov et al. (2008) | 71.548 | 55.228 | – | – | – | – |
| Kharchenko et al. (2012) | 71.565 | 55.255 | – | -0.91 | -0.75 | – |
| Loktin & Popova (2017) | 71.505 | 55.207 | – | 1.62 | -3.654 | – |
| Cantat-Gaudin et al. (2018) | 71.602 | 55.199 | 1.589 | -0.904 | -1.046 | – |
| Bica et al. (2019) | 71.561 | 55.234 | – | – | – | – |
| Soubiran et al. (2018) | 71.602 | 55.199 | – | – | – | -11.0 |
| Bossini et al. (2019) | 71.602 | 55.199 | – | – | – | – |
| Cantat-Gaudin et al. (2020) | 71.602 | 55.199 | 1.589 | -0.904 | -1.046 | – |
| Dias et al. (2021) | 71.627 | 55.234 | 1.582 | -0.896 | -1.055 | -10.466 |
| He et al. (2022) | 71.606 | 55.2 | 1.624 | -0.944 | -1.091 | – |
| Hunt & Reffert (2023) | 71.557 | 55.184 | 1.618 | -0.928 | -1.095 | -10.275 |
| Cavallo et al. (2024) | 71.648 | 55.186 | 1.623 | – | – | – |
| Hunt & Reffert (2024) | 71.557 | 55.184 | 1.618 | -0.928 | -1.095 | -10.275 |
| Alfonso et al. (2024) | 71.619 | 55.181 | 1.583 | -0.925 | -1.099 | – |
| Almeida et al. (2025) | 71.627 | 55.234 | – | – | – | – |
| UCC | 71.607 | 55.181 | 1.615 | -0.915 | -1.095 | -10.442 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Dias et al. (2002) | E(B-V)=0.18, Dist=501.0, Age=8.5 |
| Alessi et al. (2003) | E(B-V)=0.18, d_pc=500.0, logt=8.5 |
| Piskunov et al. (2007) | E(B-V)=0.18, Dist=501, logt=8.6, logM=1.004 |
| Piskunov et al. (2008) | E(B-V)=0.18, Dist=501, logt=8.6, logM=1.754, logMA=1.654 |
| Kharchenko et al. (2012) | e_bv=0.15, distance=520, log_age=8.698 |
| Loktin & Popova (2017) | E(B-V)=0.309, Dist=572, logt=7.529 |
| Cantat-Gaudin et al. (2018) | dmode=618.2 |
| Soubiran et al. (2018) | dmode=618.2 |
| Bossini et al. (2019) | AV=0.482, Dist=8.846, logA=8.759, Fe/H=0.0 |
| Cantat-Gaudin et al. (2020) | AVNN=0.52, DistPc=657.0, AgeNN=8.55 |
| Dias et al. (2021) | Av=0.814, Dist=611, logage=8.598, [Fe/H]=0.057 |
| Tarricq et al. (2022) | Dist=647, logAgeNN=8.58 |
| He et al. (2022) | A0=0.85, logAge=8.45 |
| Hunt & Reffert (2023) | AV50=0.572, diffAV50=0.753, MOD50=8.841, logAge50=8.421 |
| Cavallo et al. (2024) | AV50=0.89, dMod50=8.96, logAge50=8.4, [Fe/H]50=0.27 |
| Hunt & Reffert (2024) | MassJ=289.186, MassTot=407.075 |
| Alfonso et al. (2024) | AV=0.52019, MOD=9.08935, logAge=8.84572, Z=0.05757 |
| Almeida et al. (2025) | AV=0.814, Dist=611, logAge=8.598, MassRk=391.2 |
Search coordinates in Bayestar19