Southern Versus Northern Hemisphere Skies

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The southern skies, those witnessed primarily by inhabitants south of the equator, provide a rich and splendid array of astronomical objects. A recent publication (Astronomy Magazine, June 2000) reported on a survey of beautiful deep sky objects witnessed by northern observers versus southern observers. The authors developed a rating system to determine which hemisphere had the most beautiful deep-sky objects. They awarded 5-points to the best individual object in each object class, 3-points for second, and one point for third. They also awarded 5-points to the hemisphere having the best overall representation of each class. What did they find? Table 1* below summarises their results.

Table 1.
Tabulated Points Awarded for Beautiful Southern Hemisphere (
Purple) and Northern Hemisphere (Green) Deep-Sky Objects of Five Different Classes.

  Class of Object Southern Northern
  Open Clusters
   
The Pleiades (M 45)
    Double Cluster (NGCs 869 & 884)

   
Jewel Box (NGC 4755)
 
6 8
  Globular Clusters
   
47 Tucanae (NGC 104)
    Omega Centauri (NGC 5139)
    M 22 (NGC 6656)

 
14 0
  Planetary Nebulae
   
Dumbell Nebula (M27)
    Ring Nebula (M57)

   
Saturn Nebula (NGC 7009)
 
6 8
  Emission Nebulae
   
Orion Nebula (M 42)
   
Eta Carinae Nebula (NGC 3372)
    Tarantula Nebula (NGC 2070)

 
11.5 2.5
  Galaxies
   
Large & Small Magellanic Clouds
    Andromeda Galaxy (M 31)

   
Centaurus A (NGC 5128)
 
8.5 5.5
  Total Score 46 24

Clearly, southern observers are lucky. Let’s take Globular Clusters (GCs) for example. The best three GCs 47 Tucanae (NGC 104), Omega Centauri (NGC 5139), and M22, are all Southern sky spectacles. Omega Centauri is visible to the naked eye at magnitude 3.68 as a fuzzy patch of light and is easily resolved into pinpoints of light with a small telescope.

Of course, many northern observers can see southern objects and vice versa. Were I to drive to the north of my island state at the right time of year, the Andromeda Galaxy could be seen just above the watery horizon. Moreover, there has been many images captured of Omega Centauri from the southern states of the USA.

*Table adapted from: Sheehan, W., & Field, L. (2000). North VS South: Which hemisphere holds the most beautiful sky objects? Astronomy, June, 55-59.

 

All information and images are copyright © 2003-2004 by P B Langsford. Please ask if you wish to use them or link to them

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This site was last updated Monday November 29, 2004 19:21