Bochum 1

(FSR 0911; MWSC 864; BBD 7)

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0.56 UTI
0.57
CN
0.12
Cdens
0.75
CC3
0.69
Clit
1.0
Cdup
Nm (P>50%) 64
Core radius and density 2.9 [pc], 0.6 [pc-2]
C3 classification AB
  • CN 0.57 Moderately populated
  • Cdens 0.12 Very loose
  • CC3 0.75 High quality
  • Clit 0.69 Moderately 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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Bochum 1 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate* distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is moderately studied in the literature.

(*): The parallax distance estimate (~4.81 kpc) differs significantly from the median photometric distance (~3.26 kpc).

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

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.84 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.84 (50th percentile).

Ahumada & Lapasset (2007)
Apparent cluster diameter from (1975A&AS...20...85M).

Data
🔍 Search references for Bochum 1 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– 96.267 19.846 0.208 -0.188 -0.465 59.975
Yang et al. 2025 96.257 19.846 – – – –
Zhang et al. 2024 96.257 19.846 – – – –
Hunt & Reffert 2024 96.257 19.846 0.209 -0.104 -0.506 22.607
Cavallo et al. 2024 96.365 19.833 0.209 – – –
Hunt & Reffert 2023 96.257 19.846 0.209 -0.104 -0.506 22.607
Just et al. 2023 96.314 19.781 – – – –
Jaehnig et al. 2021 96.331 19.895 0.234 -0.18 -0.43 –
Bica et al. 2019 96.256 19.855 – – – –
Dias et al. 2018 – – – 0.38 -2.88 –
Loktin & Popova 2017 96.36 19.768 – 0.63 -1.64 38.0
Sampedro et al. 2017 96.354 19.767 – 1.43 -1.38 –
Kharchenko et al. 2016 96.314 19.781 – – – –
Dias et al. 2014 96.354 19.767 – 0.63 -1.64 11.38
Kharchenko et al. 2013 96.322 19.78 – -0.93 -2.82 38.0
Froebrich et al. 2007 96.25 19.867 – – – –
Ahumada & Lapasset 2007 96.375 19.767 – – – –
Dias et al. 2002 96.354 19.767 – 0.63 -1.64 11.38
Dambis 1999 96.375 19.767 – – – –
Lynga 1987 96.362 19.772 – – – –

💡 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– 3.26 1.48 2.19 8 -0.150 666 – 0
Yang et al. 2025 – – – 151 -0.140(3) – – –
Hunt & Reffert 2024 3.90 1.19 2.19 151 – 1118(1) – –
Cavallo et al. 2024 3.31 1.11 – 93 -0.160 – – –
Hunt & Reffert 2023 3.90 1.19 2.19 151 – – – –
Just et al. 2023 – – – 4 – 215 – –
Jaehnig et al. 2021 4.59(1) – – – – – – –
Loktin & Popova 2017 2.98 1.48 – 11 – – – –
Kharchenko et al. 2016 3.06 1.64 – 4 – – – –
Kharchenko et al. 2013 3.06 1.64 – 4 – – – –
Ahumada & Lapasset 2007 – 1.48 – 10 – – – 0
Dias et al. 2002 2.80 1.58 – 5 – – – –
Dambis 1999 3.21 1.81 – 3 – – – –
Lynga 1987 4.06 – – 1 – – – –

(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 1309 85.9 96.29 19.85 0.22 -0.22 -0.45 35.13 0.07
OC 0319 39.1 96.26 19.85 0.2 -0.23 -0.47 – 0.0

💡 Note: The % column shows the percentage of members that Bochum 1 shares with each listed object.

Visualization
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Bochum 1 UCC
Bochum 1 HUNT23
Galactocentric position diagram