Alessi 13

(MWSC 278; Chi For Group; Harrington 2; Slotegraaf 3; Ramakers 26)

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0.77 UTI
0.75
CN
0.34
Cdens
1.0
CC3
0.88
Clit
1.0
Cdup
Nm (P>50%) 100
Core radius and density 2.0 [pc], 1.7 [pc-2]
C3 classification AA
  • CN 0.75 Rich
  • Cdens 0.34 Loose
  • CC3 1.0 Very high quality
  • Clit 0.88 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Alessi 13 is a rich, loose object of very 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, but with a large variance across recent sources for the absorption parameter (see Parameters). It is well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.5275, e_all=0.6241.

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010). List of clusters and alike reported by B. Alessi. Asterisms reported by amateur astronomers in the web. The Preliminary Amateur Open Cluster Catalog, Version 08/03/2003.

Data
🔍 Search references for Alessi 13 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– 51.98 -35.66 9.465 36.043 -4.52 17.42
Almeida et al. 2025 51.613 -35.646 – – – –
Alfonso et al. 2024 52.383 -35.177 9.353 35.232 -4.885 –
Swiggum et al. 2024 51.993 -35.773 9.502 35.499 -4.184 17.45
Cavallo et al. 2024 52.405 -35.809 9.525 – – –
Hunt & Reffert 2023 51.993 -35.773 9.502 35.499 -4.184 18.017
He et al. 2022 52.053 -35.669 9.535 36.141 -4.606 –
Dias et al. 2021 51.613 -35.646 9.538 36.164 -4.636 20.448
Cantat-Gaudin et al. 2020 51.762 -35.821 9.584 36.332 -4.709 –
Cantat-Gaudin & Anders 2020 51.762 -35.821 9.584 36.332 -4.709 –
Monteiro & Dias 2019 51.762 -35.821 – 37.229 -4.756 2.545
Soubiran et al. 2018 51.762 -35.821 – – – 21.13
Bica et al. 2019 52.054 -35.902 – – – –
Cantat-Gaudin et al. 2018 51.762 -35.821 9.584 36.332 -4.709 –
Yen et al. 2018 51.083 -35.824 9.62 37.08 -4.3 –
Dib et al. 2018 52.02 -35.87 – – – –
Sampedro et al. 2017 50.425 -36.3 – 5.08 -0.48 –
Joshi et al. 2016 52.02 -35.87 – – – –
Netopil et al. 2016 50.425 -36.3 – – – –
Dias et al. 2014 50.425 -36.3 – 4.39 -0.03 –
Gozha et al. 2012 50.425 -36.3 – – – –
Piskunov et al. 2008 52.041 -35.902 – – – –
Kharchenko et al. 2007 53.5 -35.32 – 3.2 – 19.53
Piskunov et al. 2007 52.041 -35.902 – – – –
van den Bergh 2006 53.5 -35.317 – – – –
Kharchenko et al. 2005 52.05 -35.9 – 36.97 -3.18 20.1
Dias et al. 2002 50.425 -36.3 – 36.39 -4.74 19.53

💡 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– 0.105 0.13 0.6 68 0.180 384 – –
Almeida et al. 2025 0.10 0.04 – 59 – 22 – –
Alfonso et al. 2024 0.11 0.10 – 49 0.231 – – –
Swiggum et al. 2024 0.10 – – 25 – 126 – –
Cavallo et al. 2024 0.11 0.82 – 69 0.190 – – –
Hunt & Reffert 2023 0.10 0.16 0.60 25 – – – –
He et al. 2022 – 0.05 – 32 – – – –
Dias et al. 2021 0.10 0.04 – 59 0.231 – – –
Cantat-Gaudin et al. 2020 0.11 0.10 – 35 – – – –
Kounkel et al. 2020 0.14 0.83 – 43 – – – –
Cantat-Gaudin & Anders 2020 0.10 – – – – – – –
Monteiro & Dias 2019 0.10 0.26 – 68 0.017 – – –
Soubiran et al. 2018 0.10 – – – – – – –
Cantat-Gaudin et al. 2018 0.10 – – – – – – –
Yen et al. 2018 0.10 0.09 – 562 – – – –
Dib et al. 2018 0.11 – – 525 – – – –
Joshi et al. 2016 0.11 0.07 – 525 – 417 – –
Netopil et al. 2016 8.03 – – 530 – – – –
Gozha et al. 2012 0.10 – – – 0.170 417 – –
Piskunov et al. 2008 0.11 0.13 – 525 – 479(1) – –
Piskunov et al. 2007 0.11 0.13 – 525 – 351 – –
van den Bergh 2006 0.11 0.13 – – – – – –
Kharchenko et al. 2005 0.11 0.13 – 525 – – – –
Dias et al. 2002 0.10 – – – 0.170 – – –

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

Visualization
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Alessi 13 UCC
Alessi 13 HUNT23
Alessi 13 CANTAT20
Galactocentric position diagram