ASCC 19

(MWSC 547; FoF 2372; OCSN 128)

Click to load Aladin Lite
0.96 UTI
0.82
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 279
Core radius and density 1.1 [pc], 8.9 [pc-2]
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).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3434, e_all=0.0227.

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

Bica et al. (2019)
Asterisms and cluster alikes by B. Alessi reported in DAML02.

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 –
Yang et al. 2025 81.978 -1.856 – – – –
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 –
Dib et al. 2018 81.922 -1.965 – – – –
Sampedro et al. 2017 81.946 -1.98 – 1.58 -0.95 –
Joshi et al. 2016 81.922 -1.965 – – – –
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 -0.033 162 – –
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 – – –
Yang et al. 2025 – – – 7 -0.070(3) – – –
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 0.34 0.23 0.52 7 – 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 0.36(1) 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 0.140 – – –
Bossini et al. 2019 0.31 0.06 – 12 0.000 – – –
Soubiran et al. 2018 0.36 – – – – – – –
Cantat-Gaudin et al. 2018 0.36 – – – – – – –
Dib et al. 2018 0.31 – – 32 – – – –
Joshi et al. 2016 0.31 0.16 – 32 – 372 – –
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 0.45
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
ℹī¸
ASCC 19 UCC
ASCC 19 HUNT23
ASCC 19 CANTAT20
Galactocentric position diagram