HCG 35

Hickson Compact Group

17 Sept

Written By Willem Jan Drijfhout

HCG35‍ ‍
5’ x 5’ | 0.3”/px | 1000 × 1000 px

Lynx
RA 08h 45m 20.4s DEC +44° 31’ 25.9”

HCG35 is a sextet located in the constellation Lynx. The six galaxies have similar distances to Earth, in the range of approximately 750 million light-years. The group is dominated by early-type galaxies. Five out of six members are ellipticals or lenticular, with HCG35f being the only Spiral galaxy. The brightest galaxy (a) is also known as PGC 24601. It has an angular size of 0.9×0.7’ and an apparent magnitude of 15.2. All other galaxies are fainter, making this a very dim group of galaxies.
Details of all six galaxies are listed in the table below.
Hickson classification: SIII - Group diameter: 2.2’

    
        Ltr
        Primary Designation
        Also Known As
        Type
        RA (J2000)
        Dec (J2000)
        Distance (Mly)
        Angular Size
        App. Mag. (B)
      

    
        
        a
        PGC 24601
        MCG +8-16-28
        Lenticular (S0)
        08h 45m 24s
        +44° 31′ 54″
        ~738
        0.9′ × 0.7′
        15.2
      

        
        b
        PGC 24597
        —
        Elliptical (E)
        08h 45m 28s
        +44° 32′ 12″
        ~745
        0.7′ × 0.6′
        15.6
      

        
        c
        PGC 24596
        —
        Elliptical (E)
        08h 45m 21s
        +44° 32′ 00″
        ~767
        0.6′ × 0.5′
        15.9
      

        
        d
        PGC 24599
        —
        Lenticular (S0)
        08h 45m 32s
        +44° 31′ 06″
        ~758
        0.6′ × 0.4′
        16.1
      

        
        e
        PGC 24598
        —
        Elliptical (E)
        08h 45m 30s
        +44° 30′ 48″
        ~749
        0.5′ × 0.4′
        16.4
      

        
        f
        PGC 24600
        —
        Spiral (Sb)
        08h 45m 33s
        +44° 31′ 30″
        ~754
        0.5′ × 0.3′
        ~18.4
      

  
    Coordinates & photometry: Hickson et al. (1989, ApJS 70, 687); Hickson et al. (1992, ApJ 399, 353); HEASARC HCGGALAXY; NASA/IPAC NED; Da Rocha et al. (2008, MNRAS).
    Distances derived from individual heliocentric radial velocities (vₛ ≈ 15,950–16,600 km/s; group mean 16,252 km/s) using H₀ = 70 km/s/Mpc.
    Angular sizes from B = 24.5 mag/arcsec² isophotes. Apparent magnitudes in B band. HCG 35f magnitude from stellar-journeys.org observer report.
    HCG 35 is a sextet dominated by 5 early-type galaxies; HCG 35a (S0) shows weak emission lines extending beyond its nucleus (Mendes de Oliveira & Hickson 1994).
  

Imaging

**Visibility graph at location:** Remote hosting facility Roboscopes in Fregenal de la Sierra, Spain (38°N 6°W)

  
    Telescope
    Planewave CDK14 (2563mm @ f/7.2)
  
    Mount
    10Micron GM2000HPS
  
    Camera
    Moravian C3-61000 Pro
  
    Filters
    Chroma 2" Luminance
  
    Software
    Voyager, MW4, PixInsight

  
    Capture date(s)
    30 april 2026
  
    Settings
    -10°C, gain 0, bin 1
  
    Exposure
    23 × 300s @ Gain 0 (1h 55min)
  
    Filters
    Chroma 2" Luminance
  
    Processing
    WBPP, GraXpert, BXT, MAS, NXT, invert, crop

Willem Jan Drijfhout

HCG 35

Imaging

HCG 92