ASCC 77

(Ferrero 15; MWSC 2205; FoF 2223; LP 2223; FoF 2310)

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0.83 UTI
0.78
CN
1.0
Cdens
1.0
CC3
0.68
Clit
1.0
Cdup
Nm (P>50%) 177
Core radius and density 1.5 [pc], 8.3 [pc-2]
C3 classification AA
  • CN 0.78 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.68 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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ASCC 77 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near 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 age parameter (see Parameters). It is moderately studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0836, e_all=0.0818.

Bica et al. (2019)
Asterisms reported by amateur astronomers in the web. Asterisms and clusters by L. Ferrero.

Morales et al. (2013)
Classified as morphological type 'OC0' (emerging exposed cluster). Morphological flag: one or a few submm emission within the cluster area, but the submm emission is likely associated to the cluster.

Data
🔍 Search references for ASCC 77 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– 212.699 -62.343 0.875 -4.266 -3.195 -17.011
Li et al. 2025 212.694 -62.331 0.842 -4.243 -3.22 –
Wei et al. 2025 212.719 -62.359 0.875 -4.257 -3.19 –
Almeida et al. 2025 212.723 -62.322 – – – –
Hunt & Reffert 2024 212.696 -62.36 0.875 -4.257 -3.162 -16.422
Cavallo et al. 2024 212.754 -62.315 0.879 – – –
Hunt & Reffert 2023 212.696 -62.36 0.875 -4.257 -3.162 -16.422
Almeida et al. 2023 212.727 -62.333 – – – –
He et al. 2022 212.699 -62.341 0.878 -4.278 -3.186 –
Tarricq et al. 2022 212.641 -62.363 0.874 -4.26 -3.209 –
Dias et al. 2021 212.723 -62.322 0.844 -4.246 -3.213 –
Cantat-Gaudin et al. 2020 212.694 -62.331 0.842 -4.243 -3.22 –
Cantat-Gaudin & Anders 2020 212.694 -62.331 0.842 -4.243 -3.22 –
Liu & Pang 2019 212.745 -62.3 0.835 -4.202 -3.176 –
Bica et al. 2019 212.695 -62.327 – – – –
Cantat-Gaudin et al. 2018 212.694 -62.331 0.842 -4.243 -3.22 –
Sampedro et al. 2017 212.7 -62.33 – -6.28 -4.69 –
Dias et al. 2014 212.7 -62.33 – -6.37 -4.66 –
Morales et al. 2013 212.7 -62.33 – – – –
Piskunov et al. 2008 212.695 -62.327 – – – –
Piskunov et al. 2007 212.695 -62.327 – – – –
Kharchenko et al. 2005 212.7 -62.33 – -4.59 -1.49 –
Dias et al. 2002 212.7 -62.33 – -6.37 -4.66 –

💡 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– 1.135 0.81 0.94 75 0.228 547 0.595 –
Li et al. 2025 1.13 0.57 – 213 0.245 – – –
Wei et al. 2025 1.15 0.69 – 148 0.250 417 0.52 –
Almeida et al. 2025 1.07 0.81 – 121 – 345 – –
Hunt & Reffert 2024 1.08 0.70 0.94 69 – 614(1) – –
Cavallo et al. 2024 1.04 0.79 – 138 0.190 – – –
Hunt & Reffert 2023 1.08 0.70 0.94 69 – – – –
Almeida et al. 2023 1.08 0.82 – 145 0.124 480(1) 0.67 –
He et al. 2022 – 1.05 – 40 – – – –
Tarricq et al. 2022 1.10 – – 98 – – – –
Dias et al. 2021 1.07 0.81 – 121 0.211 – – –
Cantat-Gaudin et al. 2020 1.14 0.64 – 81 – – – –
Kounkel et al. 2020 1.12 0.87 – 100 – – – –
Cantat-Gaudin & Anders 2020 1.15 – – – – – – –
Liu & Pang 2019 – – – 37 0.250 – – –
Cantat-Gaudin et al. 2018 1.15 – – – – – – –
Morales et al. 2013 2.20 – – 10 – – – –
Piskunov et al. 2008 2.20 0.95 – 10 – 14191(1) – –
Piskunov et al. 2007 2.20 0.95 – 10 – 3192 – –
Kharchenko et al. 2005 2.20 0.95 – 10 – – – –
Dias et al. 2002 2.20 0.95 – 10 – – – –

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

Visualization
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ASCC 77 UCC
ASCC 77 HUNT23
ASCC 77 CANTAT20
Galactocentric position diagram