ASCC 18

(MWSC 541)

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0.84 UTI
0.68
CN
1.0
Cdens
1.0
CC3
0.75
Clit
1.0
Cdup
N50 (P>50% members) 87
Radius (P>50% members) 31.5 [arcmin]
C3 classification AA
  • CN 0.68 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.75 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 18 is a moderately populated, 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 (see Parameters). It is well-studied in the literature.

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

Very close Low extinction Near-solar metallicity Very young

Cavallo et al. (2024)
Gold sample.

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

Data
🔍 Search references for ASCC 18 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 99999– 81.526 0.321 2.4 0.153 1.392 25.207
Zhang et al. 2024 81.33 0.368 – – – –
Cavallo et al. 2024 81.322 0.317 2.415 – – –
Hunt & Reffert 2023 81.33 0.368 2.415 0.156 1.373 26.158
Just et al. 2023 81.555 0.901 – – – –
Donor et al. 2020 81.562 0.9 – 1.13 -0.31 21.2
Bica et al. 2019 81.54 0.824 – – – –
Kharchenko et al. 2016 81.555 0.901 – – – –
Dias et al. 2014 81.542 0.82 – 2.67 -1.96 –
Kharchenko et al. 2013 81.562 0.9 – 3.21 -0.96 24.4
Gozha et al. 2012 81.542 0.82 – – – –
Piskunov et al. 2008 81.532 0.819 – – – –
Kharchenko et al. 2007 81.54 0.82 – 0.62 – 24.4
Kharchenko et al. 2005 81.54 0.82 – 0.89 -0.02 13.39

💡 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– 0.4 0.19 0.76 13 0.063 262 – –
Zhang et al. 2024 – – – – 0.063(1) – – –
Cavallo et al. 2024 0.40 0.40 – 6 0.150 – – –
Hunt & Reffert 2023 0.40 0.23 0.76 9 – – – –
Just et al. 2023 – – – 14 – 10 – –
Donor et al. 2020 – – – – -0.140 – – –
Kharchenko et al. 2016 0.31 0.19 – 14 – – – –
Kharchenko et al. 2013 0.31 0.19 – 14 – – – –
Gozha et al. 2012 0.50 – – 13 – 513 – –
Piskunov et al. 2008 0.50 0.19 – 13 – – – –
Kharchenko et al. 2005 0.50 0.19 – 13 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OCSN 58 49.4 81.25 0.32 2.4 0.15 1.36 26.71 0.01
OCSN 57 4.6 82.08 1.67 2.74 -0.52 0.79 29.19 0.1

💡 Note: The % column shows the percentage of members that ASCC 18 shares with each listed object.

Visualization
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ASCC 18 UCC
ASCC 18 HUNT23
Galactocentric position diagram