Hemisphere:  Northern  ·  Contains:  NGC 770  ·  NGC 772
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Arp 78, 


Arp 78
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Arp 78

Technical card

Imaging telescopes or lenses: GSO RC12

Imaging cameras: Atik 4000

Mounts: Software Bisque Paramount MX

Guiding cameras: Lodestar

Focal reducers: AP CCDT67

Software: PixInsight

Filters: Baader Planetarium B 36mm  ·  Baader Planetarium G 36mm  ·  Baader Planetarium R 36mm

Dates:Oct. 19, 2014Oct. 22, 2014Oct. 23, 2014Oct. 24, 2014

Baader Planetarium B 36mm: 25x450" bin 2x2
Baader Planetarium G 36mm: 27x450" bin 2x2
Baader Planetarium L 36mm: 61x900" bin 1x1
Baader Planetarium R 36mm: 20x450" bin 2x2

Integration: 24.2 hours

Avg. Moon age: 20.83 days

Avg. Moon phase: 5.09%

Basic astrometry details

Astrometry.net job: 396955

RA center: 1h 59' 20"

DEC center: +19° 0' 28"

Pixel scale: 0.957 arcsec/pixel

Orientation: 176.833 degrees

Field radius: 0.338 degrees

Resolution: 1800x1800

Locations: Observatorio remoto Tomas Lopez en AstroCamp, Nerpio, Albacete, Spain

Data source: Own remote observatory

Remote source: AstroCamp


NGC 772 (also known as Arp 78) is an unbarred spiral galaxy approximately 130 million light-years away in the constellation Aries.
Around 200,000 light years in diameter, NGC 772 is twice the size of the Milky Way Galaxy, and is surrounded by several satellite galaxies – including the dwarf elliptical, NGC 770 – whose tidal forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed than the others arms. Halton Arp includes NGC 772 in his Atlas of Peculiar Galaxies as Arp 78, where it is described as a "Spiral galaxy with a small high-surface brightness companion".

Collaboration between Salvatore Iovene, Jaime Alemany and me.



License: None (All rights reserved)

Sky plot

Sky plot


Arp 78,