ASCC 123

(MWSC 3654; OCSN 134)

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0.92 UTI
0.68
CN
0.89
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 87
Radius (P>50% members) 65.2 [arcmin]
  • CN 0.68 Moderately populated
  • Cdens 0.89 Dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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ASCC 123 is a moderately populated, dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is very well-studied in the literature.

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

Very close Low extinction Near-solar metallicity Young

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

Hunt & Reffert (2024)
Classified as a moving group.

Data
🔍 Search references for ASCC 123 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 340.06 54.113 4.3 12.249 -1.482 -4.992
Li et al. 2025 340.299 53.986 4.262 12.093 -1.407 –
Almeida et al. 2025 340.223 54.174 – – – –
Alfonso et al. 2024 353.262 52.937 2.226 7.956 -2.345 –
Zhang et al. 2024 340.563 54.199 – – – –
Qin et al. 2023 340.56 53.96 4.24 11.95 -1.25 -4.13
He et al. 2022 340.612 54.11 4.308 12.345 -1.525 –
Dias et al. 2021 340.223 54.174 4.287 12.309 -1.553 -3.225
Cantat-Gaudin et al. 2020 340.299 53.986 4.262 12.093 -1.407 –
Cantat-Gaudin & Anders 2020 340.299 53.986 4.262 12.093 -1.407 –
Soubiran et al. 2018 340.299 53.986 – – – -2.49
Bica et al. 2019 340.657 54.261 – – – –
Cantat-Gaudin et al. 2018 340.299 53.986 4.262 12.093 -1.407 –
Yen et al. 2018 340.4 54.166 4.38 11.67 -1.09 –
Dias et al. 2014 340.65 54.26 – -1.45 -1.72 –
Gozha et al. 2012 340.65 54.26 – – – –
Piskunov et al. 2008 340.642 54.256 – – – –
Kharchenko et al. 2007 340.65 54.26 – 1.28 – -6.46
Kharchenko et al. 2005 340.65 54.26 – 12.5 -1.06 -6.46
Dias et al. 2002 340.65 54.26 – 12.55 -1.03 -6.46

💡 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] Bfr BSS
Li et al. 2025 0.25 0.22 – 61 -0.047 – – –
Almeida et al. 2025 0.23 0.31 – 62 – 44 – –
Alfonso et al. 2024 0.23 0.00 – 75 -0.008 – – –
Zhang et al. 2024 – – – – 0.068* – – –
Qin et al. 2023 0.30 0.62 – 71 – – – –
He et al. 2022 – 0.50 – 50 – – – –
Dias et al. 2021 0.23 0.31 – 62 -0.006 – – –
Cantat-Gaudin et al. 2020 0.23 0.00 – 45 – – – –
Cantat-Gaudin & Anders 2020 0.23 – – – – – – –
Soubiran et al. 2018 0.23 – – – – – – –
Cantat-Gaudin et al. 2018 0.23 – – – – – – –
Yen et al. 2018 0.24 0.30 – 126 – – – –
Gozha et al. 2012 0.25 – – 257 – 468 – –
Piskunov et al. 2008 0.25 0.31 – 257 – – – –
Kharchenko et al. 2005 0.25 0.31 – 257 – – – –
Dias et al. 2002 0.25 0.31 – 257 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Theia 117 56.3 340.81 53.94 4.32 12.33 -1.63 -4.29 0.0

💡 Note: The % column shows the percentage of members that ASCC 123 shares with each listed object.

Visualization
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ASCC 123 UCC
ASCC 123 CANTAT20
Galactocentric position diagram