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ASTR-3030 Methods & Instrumentation

ASTR-3030 Methods & Instrumentation. Day 3. Time to Get Busy. A Night at an Observatory. Announcements. Read Chapter 1 & 2 Homework Set 1: Due Thursday Sept. 15 1 st quarter observing nights: Tues & Wed Sept 6 & 7 @ 8:00 pm. Magnitudes.

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ASTR-3030 Methods & Instrumentation

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  1. ASTR-3030Methods & Instrumentation Day 3

  2. Time to Get Busy A Night at an Observatory

  3. Announcements Read Chapter 1 & 2 Homework Set 1: Due Thursday Sept. 15 1st quarter observing nights: Tues & Wed Sept 6 & 7 @ 8:00 pm

  4. Magnitudes The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere. In astronomy, absolute magnitude (also known as absolute visual magnitude when measured in the standard V photometric band) measures a celestial object's intrinsic brightness. To derive absolute magnitude from the observed apparent magnitude of a celestial object its value is corrected from distance to its observer. The absolute magnitude then equals the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, or 1 AU, depending on object type) away from the observer, in the absence of astronomical extinction.

  5. Magnitudes Pogson magnitude scale: 5th root of 100 times in brightness (2.512X) 2 main magnitude bases used today: Vega based and flux (or AB) based systems m = - 2.5 log (cps) + Zpt Difference in magnitudes is a ratio of fluxes Subscripts indicate the filter or wavelength used.

  6. Time UC Lick site: USNO site: Examples

  7. Observing Project Design What are you interested in? Why? Background research! What has been done in the past? Techniques (BAD Books) What do you hope to learn – how your work differs? New research vs. “progress reports” Review Articles – get the big picture (ARAAp) Journals (AJ, ApJ, AAp, MNRAS, ICARUS, JGR …) Tier 1 (refereed) vs. Tier 2 (maybe not) vs. Popular (Sky & Telescope) Nature, Science JAAVSO, J-SARA, IBVS, IOTA, … arXiv.org NASA ADS

  8. Observing Project Design Resources IOTA, AAVSO, SkyView Previous surveys (SDSS, 2MASS, Planck) On-line databases (NED, MAST, WEBDA, …) Standard Stars (an example) SkyView Software IRAF Sextractor TopCat supermongo Ds9 HEASARC

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