Hogg 4

(MWSC 1734; OCL 793; ESO 167 13; FSR 1515)

Click to load Aladin Lite
0.79 UTI
1.0
CN
0.73
Cdens
1.0
CC3
0.61
Clit
1.0
Cdup
Nm (P>50%) 639
Core radius and density 4.1 [pc], 3.7 [pc-2]
C3 classification AA
  • CN 1.0 Very rich
  • Cdens 0.73 Moderately dense
  • CC3 1.0 Very high quality
  • Clit 0.61 Moderately studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Hogg 4 is a very rich, moderately dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is moderately studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.84 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.84 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2236, e_all=0.1624.

Piatti et al. (2011)
Not a genuine open cluster.

Dias et al. (2002)
No cluster (Piatti, A. E.; ClariΓ‘, J. J.; Ahumada, A. V. 2011, NewA 16, 161); cat V3.5 (Jan 2016)

Data
πŸ” Search references for Hogg 4 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 149.415 -54.616 0.238 -5.034 4.476 26.492
Li et al. 2025 149.424 -54.612 0.21 -5.022 4.484 –
Hu & Soubiran 2025 149.404 -54.61 – – – –
Almeida et al. 2025 149.423 -54.608 – – – –
Hunt & Reffert 2024 149.427 -54.632 0.243 -5.035 4.472 23.941
Cavallo et al. 2024 149.404 -54.61 0.241 – – –
Hunt & Reffert 2023 149.427 -54.632 0.243 -5.035 4.472 23.941
Almeida et al. 2023 149.414 -54.61 – – – –
Just et al. 2023 149.462 -54.622 – – – –
Jadhav & Subramaniam 2021 149.424 -54.612 – – – –
Dias et al. 2021 149.423 -54.608 0.205 -5.016 4.503 26.578
Cantat-Gaudin et al. 2020 149.424 -54.612 0.21 -5.022 4.484 –
Cantat-Gaudin & Anders 2020 149.424 -54.612 0.21 -5.022 4.484 –
Soubiran et al. 2018 149.424 -54.612 – – – 26.57
Bica et al. 2019 149.435 -54.622 – – – –
Cantat-Gaudin et al. 2018 149.424 -54.612 0.21 -5.022 4.484 –
Dib et al. 2018 149.467 -54.625 – – – –
Joshi et al. 2016 149.467 -54.625 – – – –
Kharchenko et al. 2016 149.462 -54.622 – – – –
Kharchenko et al. 2013 149.467 -54.625 – -1.9 1.5 –
Lynga 1987 149.477 -54.591 – – – –

πŸ’‘ 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– 3.71 1.83 1.7 823 -0.044 2165 0.73 0
Li et al. 2025 3.60 1.83 – 1076 0.045 – – –
Hu & Soubiran 2025 – – – – -0.150(5) – – –
Almeida et al. 2025 3.71 1.93 – 982 – 1943 – –
Hunt & Reffert 2024 3.72 1.84 1.70 823 – 5453(1) – –
Cavallo et al. 2024 3.01 1.82 – 1230 0.110 – – –
Hunt & Reffert 2023 3.72 1.84 1.70 822 – – – –
Almeida et al. 2023 3.48 1.92 – 998 -0.046 2165(1) 0.73 –
Just et al. 2023 – – – 200 – 70 – –
Jadhav & Subramaniam 2021 4.02 1.04 – 1479 – 3144 – 0(1)
Dias et al. 2021 3.71 1.93 – 982 -0.044 – – –
Cantat-Gaudin et al. 2020 4.02 1.04 – 1479 – – – –
Kounkel et al. 2020 3.90 1.90 – 525 – – – –
Cantat-Gaudin & Anders 2020 4.18 – – – – – – –
Soubiran et al. 2018 4.18 – – – – – – –
Cantat-Gaudin et al. 2018 4.18 – – – – – – –
Dib et al. 2018 1.77 – – 200 – – – –
Joshi et al. 2016 1.77 1.05 – 200 – – – –
Kharchenko et al. 2016 1.77 1.05 – 200 – – – –
Kharchenko et al. 2013 1.77 1.05 – 200 – – – –

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

Visualization
ℹ️
Hogg 4 UCC
Hogg 4 HUNT23
Hogg 4 CANTAT20
Galactocentric position diagram