Mon OB1-D

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0.38 UTI
0.9
CN
1.0
Cdens
0.75
CC3
0.31
Clit
0.58
Cdup
C3 classification AB
Number of members (P>50%) 491
Radius (P>50% members) 10.0 [arcmin]
  • CN 0.9 Very rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.31 Poorly studied
  • Cdup 0.58 Likely unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Mon OB1-D is a very rich, very dense object of high C3 quality. Its parallax locates it at a close distance, near 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 was recently reported in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

Close Low extinction Near-solar metallicity Very young

Cavallo et al. (2024)
Wood sample.

Data
🔍 Search references for Mon OB1-D 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 – 100.246 9.621 1.378 -2.089 -3.702 21.972
Wei et al. 2025 100.226 9.724 1.396 -1.862 -3.671 –
Zhang et al. 2024 100.274 9.573 – – – –
Hunt & Reffert 2024 100.274 9.573 1.378 -2.378 -3.723 21.55
Cavallo et al. 2024 100.277 9.595 1.376 – – –
Hunt & Reffert 2023 100.274 9.573 1.378 -2.378 -3.723 21.55

💡 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
Wei et al. 2025 0.61 0.38 – 13 0.250 1408 0.58 –
Zhang et al. 2024 – – – – 0.203* – – –
Hunt & Reffert 2024 – – – – – 112* – –
Cavallo et al. 2024 0.88 0.74 – 28 0.330 – – –
Hunt & Reffert 2023 0.69 0.44 1.61 6 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
NGC 2264 41.5 100.21 9.87 1.39 -1.69 -3.63 20.84 0.95
LP 44 24.2 100.27 9.56 1.38 -1.99 -3.93 19.6 0.51

💡 Note: The % column shows the percentage of members that Mon OB1-D shares with each listed object.

Visualization
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Mon OB1-D UCC
Mon OB1-D HUNT23
Galactocentric position diagram