observing
DESCRIPTION
Observing. Next Tuesday. We’ll meet at the observatory even if it is cloudy If the weather is really bad (a foot of snow or something) I’ll send an email changing the meeting place, but otherwise…. Observatory location. Observatory Location. Telescopes. Reflector 24-inch (60-cm) mirror - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/1.jpg)
Observing
![Page 2: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/2.jpg)
Next Tuesday
• We’ll meet at the observatory even if it is cloudy– If the weather is really bad (a foot of snow or
something) I’ll send an email changing the meeting place, but otherwise…
![Page 3: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/3.jpg)
Observatory location
![Page 4: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/4.jpg)
Observatory Location
![Page 5: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/5.jpg)
![Page 6: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/6.jpg)
![Page 7: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/7.jpg)
![Page 8: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/8.jpg)
Telescopes
• Reflector– 24-inch (60-cm) mirror
• Refractor– 6 inch (15-cm) achromatic lens
![Page 9: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/9.jpg)
24-inch
![Page 10: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/10.jpg)
Ritchey-Chretien
• A special kind of cassegrain telescope
• Gives good wide field images (but our CCD field of view will be limited to 11 x 11 arcmin)
![Page 11: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/11.jpg)
6-inch
![Page 12: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/12.jpg)
What to observe?
![Page 13: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/13.jpg)
A BL Lac Object
![Page 14: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/14.jpg)
• BL Lac objects are one of the family of active galactic nuclei, a group which includes quasars and Seyfert galaxies, among others
![Page 15: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/15.jpg)
Long term light curve
![Page 16: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/16.jpg)
Makarian 421
![Page 17: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/17.jpg)
![Page 18: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/18.jpg)
Reading assignment
• Read the section on Makarian 421 on the AAVSO web page
• Check the web/library for further info on BL Lac objects
• Give me (at the next class) a one page writeup on what is believed to cause the brightness changes of BL Lac objects (be sure to express this in your own words)
![Page 19: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/19.jpg)
Other possibilities
• Galaxies
![Page 20: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/20.jpg)
Star Clusters
• M67
![Page 21: Observing](https://reader036.vdocuments.us/reader036/viewer/2022062518/56814827550346895db54a50/html5/thumbnails/21.jpg)
Gaseous Nebulae
• M42