Biurakan 2

(MWSC 3267)

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0.90 UTI
0.76
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 123
Radius (P>50% members) 8.3 [arcmin]
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Biurakan 2 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close 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 mass parameter (see Parameters). It is very well-studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Very young

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Biurakan 2 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 – 302.301 35.468 0.545 -3.17 -6.886 -26.93
Li et al. 2025 302.283 35.488 0.542 -3.169 -6.843 –
Almeida et al. 2025 302.295 35.502 – – – –
Hunt & Reffert 2024 302.322 35.464 0.544 -3.195 -6.893 -22.689
Celli et al. 2024 302.283 35.488 – – – –
Cavallo et al. 2024 302.333 35.483 0.546 – – –
Hunt & Reffert 2023 302.322 35.464 0.544 -3.195 -6.893 -22.689
Almeida et al. 2023 302.303 35.503 – – – –
Just et al. 2023 302.312 35.477 – – – –
Jaehnig et al. 2021 302.301 35.475 0.573 -3.187 -6.83 –
Rain et al. 2021 302.283 35.488 0.542 -3.169 -6.843 –
Dias et al. 2021 302.295 35.502 0.548 -3.158 -6.843 –
Cantat-Gaudin et al. 2020 302.283 35.488 0.542 -3.169 -6.843 –
Cantat-Gaudin & Anders 2020 302.283 35.488 0.542 -3.169 -6.843 –
Cantat-Gaudin et al. 2018 302.283 35.488 0.542 -3.169 -6.843 –
Loktin & Popova 2017 302.295 35.483 – -0.128 -0.825 -22.0
Kharchenko et al. 2016 302.312 35.477 – – – –
Dias et al. 2014 302.3 35.483 – -1.95 -4.49 –
Kharchenko et al. 2013 302.317 35.48 – -3.3 -5.6 -22.0
Gozha et al. 2012 302.3 35.483 – – – –
Piskunov et al. 2008 302.288 35.477 – – – –
Kharchenko et al. 2007 302.29 35.48 – 0.18 – -22.0
van den Bergh 2006 302.3 35.483 – – – –
Kharchenko et al. 2005 302.29 35.48 – -3.63 -6.24 -22.0
Kharchenko et al. 2003 302.29 35.48 – -3.6 -6.31 –
Dias et al. 2002 302.3 35.483 – -1.95 -4.49 -19.66
Dambis 1999 302.3 35.483 – – – –

💡 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
Li et al. 2025 2.19 1.31 – 4 0.071 – – –
Almeida et al. 2025 1.64 1.38 – 9 – 368 – –
Hunt & Reffert 2024 – – – – – 268* – –
Celli et al. 2024 – – – 9 – 298 – –
Cavallo et al. 2024 1.55 1.41 – 8 -0.060 – – –
Hunt & Reffert 2023 1.73 1.09 1.16 4 – – – –
Almeida et al. 2023 1.73 1.42 – 8 0.027 627* 0.73 –
Just et al. 2023 – – – 17 – 97 – –
Jaehnig et al. 2021 1.76* – – – – – – –
Rain et al. 2021 1.75 1.12 – 10 – – – 0
Dias et al. 2021 1.64 1.38 – 9 0.145 – – –
Cantat-Gaudin et al. 2020 1.72 0.93 – 9 – – – –
Cantat-Gaudin & Anders 2020 1.75 – – – – – – –
Cantat-Gaudin et al. 2018 1.75 – – – – – – –
Loktin & Popova 2017 1.15 1.10 – 10 – – – –
Kharchenko et al. 2016 1.14 1.12 – 17 – – – –
Kharchenko et al. 2013 1.14 1.12 – 17 – – – –
Gozha et al. 2012 1.11 – – 10 – 138 – –
Piskunov et al. 2008 1.11 1.12 – 14 – – – –
van den Bergh 2006 1.11 1.12 – 10 – – – –
Kharchenko et al. 2005 1.11 1.12 – 14 – – – –
Kharchenko et al. 2003 1.11 1.12 – – – – – –
Dias et al. 2002 1.11 1.12 – 10 – – – –
Dambis 1999 1.45 1.30 – 16 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0102 2.4 301.71 35.64 0.53 -3.1 -6.61 -17.95 0.08

💡 Note: The % column shows the percentage of members that Biurakan 2 shares with each listed object.

Visualization
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Biurakan 2 UCC
Biurakan 2 HUNT23
Biurakan 2 CANTAT20
Galactocentric position diagram