Alessi 19

(MWSC 2887; LeDrew 5)

Click to load Aladin Lite
0.95 UTI
0.76
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 114
Stellar density (N50/rad) 6.1 [N/pc2]
C3 classification AA
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Alessi 19 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is very well-studied in the literature.

Note: This object shares a small percentage of members with a later reported entry. See table with shared members information.

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Alessi 19 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 274.775 12.228 1.708 -0.987 -7.107 -8.352
Li et al. 2025 274.741 12.311 1.71 -1.005 -7.073 –
Almeida et al. 2025 274.817 12.504 – – – –
Alfonso et al. 2024 274.827 12.267 1.676 -1.007 -7.063 –
Zhang et al. 2024 274.534 11.897 – – – –
Hunt & Reffert 2024 274.534 11.897 1.709 -1.009 -7.074 -7.866
Celli et al. 2024 274.741 12.311 – – – –
Cavallo et al. 2024 274.845 12.418 1.71 – – –
Hunt & Reffert 2023 274.534 11.897 1.709 -1.009 -7.074 -7.866
Just et al. 2023 274.776 12.194 – – – –
He et al. 2022 274.666 11.976 1.691 -1.0 -7.18 –
Dias et al. 2021 274.817 12.504 1.713 -1.012 -7.051 -47.055
Cantat-Gaudin et al. 2020 274.741 12.311 1.71 -1.005 -7.073 –
Cantat-Gaudin & Anders 2020 274.741 12.311 1.71 -1.005 -7.073 –
Bossini et al. 2019 274.741 12.311 – – – –
Soubiran et al. 2018 274.741 12.311 – – – -4.51
Bica et al. 2019 274.734 12.203 – – – –
Cantat-Gaudin et al. 2018 274.741 12.311 1.71 -1.005 -7.073 –
Loktin & Popova 2017 274.62 12.167 – 0.42 -6.56 -5.1
Kharchenko et al. 2016 274.776 12.194 – – – –
Dias et al. 2014 274.617 12.167 – -0.59 0.37 –
Kharchenko et al. 2013 274.782 12.195 – 1.04 -6.35 -5.1
Gozha et al. 2012 274.616 12.167 – – – –
Piskunov et al. 2008 274.766 12.177 – – – –
Kharchenko et al. 2007 274.62 12.17 – 0.75 – -5.1
Piskunov et al. 2007 274.766 12.177 – – – –
van den Bergh 2006 274.6 12.025 – – – –
Kharchenko et al. 2005 274.77 12.18 – -0.47 -6.97 -5.1
Alessi et al. 2003 274.6 12.025 – 0.4 -6.6 –
Dias et al. 2002 274.617 12.167 – 0.42 -6.56 7.73

💡 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] Bfrac BSS
UCC 99999– 0.57 0.14 0.95 79 0.065 159 – –
Li et al. 2025 0.57 0.28 – 72 0.139 – – –
Almeida et al. 2025 0.57 0.41 – 58 – 159 – –
Alfonso et al. 2024 0.57 0.31 – 46 0.129 – – –
Zhang et al. 2024 – – – – -0.004(1) – – –
Hunt & Reffert 2024 – – – – – 73(1) – –
Celli et al. 2024 – – – 26 – 126 – –
Cavallo et al. 2024 0.63 0.63 – 17 -0.030 – – –
Hunt & Reffert 2023 0.57 0.34 0.95 37 – – – –
Just et al. 2023 – – – 79 – 41 – –
He et al. 2022 – 0.30 – 18 – – – –
Dias et al. 2021 0.57 0.41 – 58 0.129 – – –
Cantat-Gaudin et al. 2020 0.57 0.31 – 26 – – – –
Cantat-Gaudin & Anders 2020 0.57 – – – – – – –
Bossini et al. 2019 0.57 0.16 – 24 0.000 – – –
Soubiran et al. 2018 0.57 – – – – – – –
Cantat-Gaudin et al. 2018 0.57 – – – – – – –
Loktin & Popova 2017 0.45 0.12 – 100 – – – –
Kharchenko et al. 2016 0.55 0.12 – 79 – – – –
Kharchenko et al. 2013 0.55 0.12 – 79 – – – –
Gozha et al. 2012 0.55 – – 100 – 1202 – –
Piskunov et al. 2008 0.55 0.12 – 112 – 1309(1) – –
Piskunov et al. 2007 0.55 0.12 – 112 – 632 – –
van den Bergh 2006 0.55 0.12 – 100 – – – –
Kharchenko et al. 2005 0.55 0.12 – 112 – – – –
Alessi et al. 2003 0.55 0.09 – 158 – – – –
Dias et al. 2002 0.55 0.12 – 100 – – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0068 23.7 274.55 11.88 1.7 -0.96 -7.18 -5.8 0.0

💡 Note: The % column shows the percentage of members that Alessi 19 shares with each listed object.

Visualization
ℹī¸
Alessi 19 UCC
Alessi 19 HUNT23
Alessi 19 CANTAT20
Galactocentric position diagram