Melotte 111

(Collinder 256; Coma Ber; MWSC 2020; Coma Star; Coma Berenices; OCL 558)

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0.77 UTI
0.77
CN
0.07
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 150
Stellar density (N50/rad) 0.4 [N/pc2]
C3 classification AA
  • CN 0.77 Rich
  • Cdens 0.07 Very loose
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-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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Melotte 111 is a rich, very loose object of very high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is very well-studied in the literature.

Malhotra et al. (2026)
Lowest/Highest stellar mass in the catalogue with a mass-ratio estimate: 0.12/2.17 Msun

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P130, along with HSC_1537.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Ahumada & Lapasset (2007)
= Coma cluster. Adopted cluster centre: star 91 in (1938LicOB..18..167T). Star 146 = 17 Comae = HD 108662 = AI Comae is a cluster member (1938LicOB..18..167T) and an Alpha Canum Venaticorum variable (1982A&A...109...37M). It is cited as a blue straggler by (1985ApJ...294L.103A), (1977IBVS.1293....1H), and (1982A&A...109...37M). Reference (1985ApJ...294L.103A) gives this star a projected velocity v.sin i=15km/s and a spectrum A0Vp(Sr,Cr,Si,Eu).

Data
🔍 Search references for Melotte 111 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– 185.06 25.478 11.593 -12.038 -9.002 0.38
Malhotra et al. 2026 182.979 25.277 – – – –
Li et al. 2025 186.014 25.652 11.595 -12.03 -8.973 –
Almeida et al. 2025 186.304 25.368 – – – –
Zhang et al. 2024 186.017 26.423 – – – –
Hunt & Reffert 2024 186.017 26.423 11.709 -12.155 -8.855 -0.173
Cavallo et al. 2024 186.718 25.899 11.698 – – –
Hunt & Reffert 2023 186.017 26.423 11.709 -12.155 -8.855 -0.173
He et al. 2022 185.59 25.839 11.665 -12.106 -8.951 –
Tarricq et al. 2022 186.181 26.154 11.652 -11.996 -8.763 –
Jadhav & Subramaniam 2021 186.014 25.652 – – – –
Jaehnig et al. 2021 186.175 25.766 11.616 -12.036 -8.916 –
Dias et al. 2021 186.304 25.368 11.582 -12.02 -8.909 0.124
Spina et al. 2021 186.035 25.701 11.595 -12.027 -8.979 –
Cantat-Gaudin et al. 2020 186.014 25.652 11.595 -12.03 -8.973 –
Bica et al. 2019 186.268 26.105 – – – –
Yen et al. 2018 186.099 25.957 11.55 -12.22 -9.01 –
Loktin & Popova 2017 186.27 26.1 – -6.78 -3.41 -1.0
Kharchenko et al. 2016 185.978 26.303 – – – –
Dias et al. 2014 186.275 26.1 – -6.52 -3.08 –
Kharchenko et al. 2013 185.985 26.3 – -11.72 -8.76 -1.0
Gozha et al. 2012 186.275 26.1 – – – –
Piskunov et al. 2008 185.623 25.854 – – – –
Kharchenko et al. 2007 186.27 26.1 – 4.0 – -0.87
Piskunov et al. 2007 185.623 25.854 – – – –
Ahumada & Lapasset 2007 186.275 26.1 – – – –
van den Bergh 2006 185.625 25.85 – – – –
Kharchenko et al. 2005 185.62 25.85 – -11.45 -8.98 -1.17
Kharchenko et al. 2003 185.62 25.85 – -11.03 -9.0 –
Chen et al. 2003 186.27 26.099 – -11.38 -9.05 -0.1
Dias et al. 2002 186.275 26.1 – -6.78 -3.41 0.01

💡 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– 0.09 0.03 0.44 603 0.020 256 – 0
Malhotra et al. 2026 0.09 0.03 – 622 -0.050 – – –
Li et al. 2025 0.10 0.26 – 604 0.066 – – –
Almeida et al. 2025 0.09 0.15 – 619 – 51 – –
Zhang et al. 2024 – – – – 0.062(1) – – –
Hunt & Reffert 2024 – – – – – 49(1) – –
Cavallo et al. 2024 0.09 0.29 – 295 0.200 – – –
Hunt & Reffert 2023 0.09 0.07 0.44 655 – – – –
He et al. 2022 – 0.35 – 562 – – – –
Spina et al. 2022 – – – – 0.002 – – –
Tarricq et al. 2022 0.09 – – 646 – – – –
Jadhav & Subramaniam 2021 0.09 0.00 – 646 – 267 – 0(1)
Jaehnig et al. 2021 0.09(1) – – – – – – –
Dias et al. 2021 0.09 0.15 – 619 -0.060 – – –
Spina et al. 2021 0.09 – – 646 -0.002(20) – – –
Cantat-Gaudin et al. 2020 0.09 0.00 – 646 – – – –
Yen et al. 2018 0.09 0.17 – 562 – – – –
Loktin & Popova 2017 0.10 0.04 – 449 – – – –
Kharchenko et al. 2016 0.09 0.00 – 692 – – – –
Kharchenko et al. 2013 0.09 0.00 – 692 0.070 – – –
Gozha et al. 2012 0.10 – – 449 0.020 331 – –
Piskunov et al. 2008 0.09 0.00 – 603 – 317(1) – –
Piskunov et al. 2007 0.09 0.00 – 603 – 246 – –
Ahumada & Lapasset 2007 – 0.03 – 447 – – – 1
van den Bergh 2006 0.10 0.03 – 447 – – – –
Kharchenko et al. 2005 0.09 0.00 – 603 – – – –
Kharchenko et al. 2003 0.09 0.03 – – – – – –
Chen et al. 2003 0.10 0.04 – 440 -0.050(1) – – –
Dias et al. 2002 0.10 0.04 – 449 0.070 – – –

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

Visualization
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Melotte 111 UCC
Melotte 111 HUNT23
Melotte 111 CANTAT20
Galactocentric position diagram