ASCC 19

(MWSC 547; FoF 2372; OCSN 128)

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0.96 UTI
0.82
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 279
Stellar density (N50/rad) 22.8 [N/pc2]
C3 classification AA
  • CN 0.82 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¸
ASCC 19 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

Liu et al. (2025)
Classified as primordial binary cluster 5 along with UBC_17a, and of multiple system 1 along with UBC_17a and OCSN_61.

Palma et al. (2025)
Part of multiple system G10, along with ASCC_20, OC_0339, OCSN_61 and UBC_17a.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg02' along with Gulliver 6, UBC 17a and UBC 17b.

Data
🔍 Search references for ASCC 19 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 82.052 -1.959 2.797 1.148 -1.218 19.284
Otto et al. 2026 81.978 -1.856 – 1.15 -1.23 23.2
Liu et al. 2025 81.98 -1.86 2.81 1.17 -1.18 11.65
Li et al. 2025 81.982 -1.987 2.768 1.152 -1.234 –
Almeida et al. 2025 82.004 -1.962 – – – –
Alfonso et al. 2024 81.988 -1.94 2.769 1.169 -1.185 –
Zhang et al. 2024 81.978 -1.856 – – – –
Swiggum et al. 2024 81.978 -1.856 2.805 1.168 -1.182 22.783
Hunt & Reffert 2024 81.978 -1.856 2.805 1.168 -1.182 11.651
Celli et al. 2024 81.982 -1.987 – – – –
Cavallo et al. 2024 81.966 -1.89 2.806 – – –
Hunt & Reffert 2023 81.978 -1.856 2.805 1.168 -1.182 11.651
Qin et al. 2023 81.95 -1.92 2.79 1.2 -1.24 20.41
Just et al. 2023 81.915 -1.964 – – – –
He et al. 2022 82.982 -3.059 2.781 1.521 -1.244 –
Dias et al. 2021 82.004 -1.962 2.756 1.112 -1.303 23.576
Spina et al. 2021 82.047 -1.976 2.767 1.153 -1.282 –
Cantat-Gaudin et al. 2020 81.982 -1.987 2.768 1.152 -1.234 –
Donor et al. 2020 81.922 -1.965 – 1.24 -1.14 23.0
Zhong et al. 2020 81.982 -1.987 – 1.152 -1.234 17.537
Cantat-Gaudin & Anders 2020 81.982 -1.987 2.768 1.152 -1.234 –
Liu & Pang 2019 82.222 -1.971 2.768 1.193 -1.138 –
Dias et al. 2019 81.983 -1.987 2.768 1.152 -1.234 23.574
Bossini et al. 2019 81.982 -1.987 – – – –
Soubiran et al. 2018 81.982 -1.987 – – – 23.89
Cantat-Gaudin et al. 2018 81.982 -1.987 2.768 1.152 -1.234 –
Kharchenko et al. 2016 81.915 -1.964 – – – –
Dias et al. 2014 81.946 -1.98 – 1.43 -1.0 –
Kharchenko et al. 2013 81.922 -1.965 – 0.28 -0.59 19.8
Gozha et al. 2012 81.946 -1.98 – – – –
Piskunov et al. 2008 81.939 -1.974 – – – –
Kharchenko et al. 2007 81.94 -1.98 – 0.8 – 19.8
Piskunov et al. 2007 81.939 -1.974 – – – –
Kharchenko et al. 2005 81.94 -1.98 – 0.61 -0.68 19.3

💡 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– 0.35 0.16 0.52 13 -0.015 124 – –
Otto et al. 2026 – – – 10 0.030(15) – – –
Liu et al. 2025 0.38 0.11 – 13 – – – –
Li et al. 2025 0.30 0.15 – 13 -0.141 – – –
Almeida et al. 2025 0.36 0.19 – 14 – 162 – –
Alfonso et al. 2024 0.35 0.13 – 11 0.076 – – –
Zhang et al. 2024 – – – – -0.015(1) – – –
Swiggum et al. 2024 0.35 – – 7 – 72 – –
Hunt & Reffert 2024 – – – – – 56(1) – –
Celli et al. 2024 – – – 10 – 181 – –
Cavallo et al. 2024 0.35 0.56 – 5 0.140 – – –
Hunt & Reffert 2023 0.34 0.23 0.52 7 – – – –
Qin et al. 2023 0.40 0.28 – 10 – – – –
Just et al. 2023 – – – 32 – 16 – –
He et al. 2022 – 0.20 – 8 – – – –
Spina et al. 2022 – – – – -0.056 – – –
Dias et al. 2021 0.36 0.19 – 14 0.076 – – –
Spina et al. 2021 0.36 – – 10 -0.059(20) – – –
Cantat-Gaudin et al. 2020 0.35 0.13 – 10 – – – –
Kounkel et al. 2020 0.36 0.31 – 13 – – – –
Donor et al. 2020 – – – – -0.050 – – –
Zhong et al. 2020 0.31 0.06 – 7086 -0.179 – – –
Cantat-Gaudin & Anders 2020 0.36 – – – – – – –
Liu & Pang 2019 – – – 11 -0.250 – – –
Dias et al. 2019 0.35 0.22 – 14 0.323 – – –
Bossini et al. 2019 0.31 0.06 – 12 0.000 – – –
Soubiran et al. 2018 0.36 – – – – – – –
Cantat-Gaudin et al. 2018 0.36 – – – – – – –
Kharchenko et al. 2016 0.31 0.16 – 32 – – – –
Kharchenko et al. 2013 0.31 0.16 – 32 – – – –
Gozha et al. 2012 0.35 – – 44 – 372 – –
Piskunov et al. 2008 0.35 0.03 – 44 – 214(1) – –
Piskunov et al. 2007 0.35 0.03 – 44 – 87 – –
Kharchenko et al. 2005 0.35 0.03 – 44 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 17 a 9.7 83.45 -1.71 2.76 1.61 -1.22 17.6 0.54
OC 0339 0.4 83.1 -0.48 2.75 1.59 -0.98 20.8 0.23

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

Visualization
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ASCC 19 UCC
ASCC 19 HUNT23
ASCC 19 CANTAT20
Galactocentric position diagram