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- Part 1: The VAO and Target Selection
Part 1: The VAO and Target Selection
Resources: MACRO Observation Planning Tool, Skymaps.com
When using a simple optical telescope to look at the night sky, you could just point at random objects and locations to see what you could see, but you would probably see a lot more interesting things if you planned ahead. To plan, you would need to select an interesting object that would be in the sky on the night you will be observing.
For a fall observation, research objects from the following list: Messier 13, Messier 27, Messier 31, Messier 33, Messier 57, NGC 40, NGC 869, NGC 6543, NGC 6888, NGC 6992, NGC 7635
For a spring observation, consider objects from the following list:
Jupiter, Messier 1, Messier 42, Messier 104, Messier 65/Messier 66/NGC 3628 (Leo Triplet)
Star Clusters: Messier 35, Messier 36, Messier 37, Messier 38, Messier 44, Messier 46, Messier 47, Messier 48, Messier 50, Messier 67
For a summer observation, consider objects from the following list: Messier 11 (open star cluster), Messier 13 (globular star cluster), Messier 16 (emission nebula), Messier 27 (planetary nebula), Messier 57 (planetary nebula)
Alternatively, to plan, you could look on a sky map or use software to find out what would be in the sky on the night of your observation. These tools can show the night sky at a particular latitude (Iowa City is about latitude 40°) during a particular time of the year. You would need to do some checks to make sure that the objects will be visible with the specifications and restrictions of your particular telescope.
RST icon
RST Calculator
The Univeristy of Iowa RST Calculator (Rise/Set Time Calculator) will be helpful for learning which objects are up in the sky at the time you are interested in observing. At the page linked, click the RST Calculator icon. A window will pop up that will have you input the Univeristy of Iowa observatory you are interested in (Van Allen Observatory) as well as the object and date you are intersted in. Then click 'Calculate'.
The RST Calculator will output the RA and Dec of the target. When the target is above the horizon, the tool will list the elevation (altitude) of the object throughout the night at 1-hour intervals. This is useful, as the best time to view an object is when it is at the largest possible altitude above the horizon, so the target is being looked at through as little atmosphere as possible. The times of these elevations are given in 24-hour CST/CDT (central) time as well as in UT (universal time, the time in Greenwich, England).