Alessi 9
(MWSC 2670; OCSN 139)
Summary
Alessi 9 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) | 265.875 | -46.967 | – | 11.59 | -9.72 | -11.6 |
| Alessi et al. (2003) | 266.0 | -47.0 | – | 10.9 | -9.7 | – |
| Kharchenko et al. (2005) | 265.98 | -47.18 | – | 11.59 | -9.72 | -11.6 |
| Piskunov et al. (2007) | 265.963 | -47.183 | – | – | – | – |
| Kharchenko et al. (2007) | 265.6 | -47.01 | – | 1.4 | – | -11.6 |
| Piskunov et al. (2008) | 265.963 | -47.183 | – | – | – | – |
| Kharchenko et al. (2013) | 266.295 | -47.185 | – | 10.75 | -9.5 | -11.6 |
| Kharchenko et al. (2016) | 266.285 | -47.186 | – | – | – | – |
| Yen et al. (2018) | 266.249 | -47.043 | 4.94 | 9.71 | -8.81 | – |
| Cantat-Gaudin et al. (2018) | 265.974 | -47.028 | 4.822 | 9.916 | -9.157 | – |
| Bica et al. (2019) | 265.983 | -47.18 | – | – | – | – |
| Soubiran et al. (2018) | 265.974 | -47.028 | – | – | – | -6.44 |
| Cantat-Gaudin et al. (2020) | 265.974 | -47.028 | 4.822 | 9.916 | -9.157 | – |
| Dias et al. (2021) | 266.019 | -47.237 | 4.793 | 9.929 | -9.144 | -6.213 |
| Tarricq et al. (2022) | 265.998 | -46.885 | 4.779 | 9.839 | -9.063 | – |
| Just et al. (2023) | 266.285 | -47.186 | – | – | – | – |
| Qin et al. (2023) | 265.9 | -46.83 | 4.76 | 9.77 | -9.12 | -5.94 |
| Hunt & Reffert (2023) | 265.642 | -46.744 | 4.778 | 9.831 | -9.151 | -8.729 |
| Cavallo et al. (2024) | 265.811 | -47.145 | 4.78 | – | – | – |
| Hunt & Reffert (2024) | 265.642 | -46.744 | 4.778 | 9.831 | -9.151 | -8.729 |
| Alfonso et al. (2024) | 265.628 | -47.181 | 4.698 | 9.753 | -9.066 | – |
| Almeida et al. (2025) | 266.019 | -47.237 | – | – | – | – |
| UCC | 265.926 | -46.921 | 4.783 | 9.923 | -9.068 | -6.731 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Dias et al. (2002) | Dist=211.0, [Fe/H]=-0.58 |
| Alessi et al. (2003) | E(B-V)=0.07, d_pc=190.0, logt=8.4 |
| Kharchenko et al. (2005) | E(B-V)=0.07, Dist=195, logt=8.42 |
| Piskunov et al. (2007) | E(B-V)=0.07, Dist=195, logt=8.42, logM=2.526 |
| Piskunov et al. (2008) | E(B-V)=0.07, Dist=195, logt=8.42, logM=2.681, logMA=2.281 |
| Kharchenko et al. (2013) | E(B-V)=0.104, d=218.0, logt=8.55, [Fe/H]=-0.58 |
| Kharchenko et al. (2016) | E(B-V)=0.104, d=218.0, logt=8.55 |
| Yen et al. (2018) | E(B-V)=0.091, d=224.9, logt=8.42 |
| Cantat-Gaudin et al. (2018) | dmode=206.1 |
| Soubiran et al. (2018) | dmode=206.1 |
| Cantat-Gaudin et al. (2020) | AVNN=0.0, DistPc=215.0, AgeNN=8.45 |
| Dias et al. (2021) | Av=0.155, Dist=207, logage=8.593, [Fe/H]=-0.002 |
| Tarricq et al. (2022) | Dist=213, logAgeNN=8.45 |
| Just et al. (2023) | logt=8.55, logmt=1.272 |
| Qin et al. (2023) | E(B-V)=0.07, m-M=6.72, logt=8.45 |
| Hunt & Reffert (2023) | AV50=0.116, diffAV50=0.405, MOD50=6.607, logAge50=8.614 |
| Cavallo et al. (2024) | AV50=0.49, dMod50=6.66, logAge50=8.41, [Fe/H]50=0.31 |
| Hunt & Reffert (2024) | MassJ=150.758, MassTot=310.306 |
| Alfonso et al. (2024) | AV=0.00159, MOD=6.65904, logAge=8.48056, Z=-0.0012 |
| Almeida et al. (2025) | AV=0.155, Dist=207, logAge=8.593, MassRk=153.0 |
Search coordinates in Bayestar19