RIT Observatory Facilities

The Observatory Grounds

The Observatory consists of three main buildings: a house, in which students and members of the public may gather, a structure with a roll-off roof (housing a 14-inch telescope) and a 5-meter dome (housing the 12-inch telescope). There is also a concrete pad with electric power upon which portable instruments may be placed for large groups to use.

Our house sits on the west side of John Street at number 645, just north of the intersection with Bailey Road. The telescope buildings are behind the house, hidden from the road.

There are quite a few trees to the East and South of the telescopes, which block a portion of the sky -- but also block lights from the street. Here are rough values for the local horizon caused by the trees (based on measurements made Aug 20, 2003):

Instructions for using the Observatory:

This view from the pad looks northeast past the 5-meter Ash Dome and the roll-off structure built by Arch Technology.

Here is the roll-off building with the roof fully extended, from the southern end, and from the west.


Rolloff Telescope

We used to have a 16-inch f/15 Autoscope cassegrain reflector in this building, but its optics weren't very good, and it had such a long focal length (about 6000 mm) that its field of view was tiny. That made it very hard to find objects quickly, and so frustrated both telescope operators and people waiting to take a look.

So, in the winter of 2009, we installed a new telescope: a 14-inch f/10 Celestron. The telescope sits atop a big Astro-Physics German Equatorial mount which can be controlled by hand or by a computer.


12-inch Meade Telescope

We keep a 12-inch Meade Schmidt-Cassegrain telescope inside the 5-meter dome, permanently mounted on an Astro Pier.

On Aug 26, 2006, we added a set of mounting rails and rings from Scope Stuff so that we can mount a small telescope on the 12-inch to act as a big guider. I hope this will help us to find objects when we use cameras with very small fields of view. The first instrument we'll try is a 90mm f/5.6 (500 mm focal length) Maksutov from Pro-Optics; it should provide much wider fields than the 3000mm of the 12-inch. We have some other small telescopes we can try, too.

The Meade 12-inch telescope lives inside this 5-meter Ash Dome.


Portable Telescopes

The observatory also has several "portable" instruments, including:

A 8-inch f/5 Dobsonian (property of the RIT Astronomy ClubPicture of Dobsonian telescope

Picture of AstroScan Telescopean AstroScan,

a Meade Starfinder 6-inch f/8 Newtonian (generously donated by Mr. Tim Thompson),

and a 6-inch f/10 Newtonian (on loan from J. Kern).


The KIWI OSD video time insertion unit

For certain purposes, most notably occultations of stars by asteroids, it is important to have precise measurements of the time of an event. Kiwi Geoff has designed an On-Screen Display (OSD) unit which takes time signals from a GPS receiver and writes timestamps on each frame of a video signal.

During the Winter Quarter, 2004-2005, RIT physics major Matt Montanaro did an independent study project in which he put together two of the KIWI OSD units. You can read his report -- which includes a complete part list! -- in several formats:

We weren't able to test the unit on the sky during the winter quarter, due to very bad weather, but we are looking forward to doing so as clear skies return in the spring.


Rough limiting magnitudes

These are very rough, but may help one to make plans for using our cooled CCD cameras: an SBIG ST-8E and an SBIG-ST9.

                             16-inch                   12-inch
                       f/15         f/10         f/10        f/6
-------------------------------------------------------------------

unfiltered
  ST8 3x3 120sec                                 17-18
  ST9 1x1  20sec                    15-16

V filter
  ST8 3x3  30sec                                            16-17

-------------------------------------------------------------------

Notes:

 Jul 02, 2005:  16-inch f/15 + ST9 unfiltered, 20-sec exp 
                     yields scatter 0.10 mag for V ~ 15.5 star

There are also several pages describing the limiting magnitude of our video cameras under particular situations.



 

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