OCSN 54

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0.36 UTI
0.57
CN
0.21
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%) 65
Core radius and density 1.5 [pc], 1.1 [pc-2]
C3 classification AB
  • CN 0.57 Moderately populated
  • Cdens 0.21 Very loose
  • CC3 0.75 High quality
  • Clit 0.13 Rarely studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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OCSN 54 is a moderately populated, very loose object of 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, young cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a very small percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Liu et al. (2025)
Classified as primordial binary cluster 318 along with Theia_818.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.65 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.65 (50th percentile).

Data
🔍 Search references for OCSN 54 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– 77.572 17.522 2.325 0.597 -5.46 15.205
Zhang et al. 2024 77.622 17.431 – – – –
Swiggum et al. 2024 77.622 17.431 2.267 0.632 -5.448 12.494
Cavallo et al. 2024 77.567 18.111 2.266 – – –
Hunt & Reffert 2023 77.622 17.431 2.267 0.632 -5.448 14.302
Qin et al. 2023 77.62 17.42 2.36 0.59 -5.52 12.5

💡 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– 0.49 0.72 0.66 32 -0.013 95 – –
Liu et al. 2025 0.60 0.27 – 30 – – – –
Zhang et al. 2024 – – – – -0.095(1) – – –
Swiggum et al. 2024 0.43 – – 35 – 95 – –
Cavallo et al. 2024 0.49 0.98 – 9 0.070 – – –
Hunt & Reffert 2023 0.42 0.62 0.66 35 – – – –
Qin et al. 2023 0.58 0.82 – 32 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OCSN 111 6.2 79.29 18.61 2.83 -0.11 -5.87 21.26 0.38

💡 Note: The % column shows the percentage of members that OCSN 54 shares with each listed object.

Visualization
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OCSN 54 UCC
OCSN 54 HUNT23
Galactocentric position diagram