Photometry: Basic Questions
Basics of Photometry
How do you identify objects in your image?
How do you measure the flux from an object?
What are the potential challenges?
Does it matter what type of object youre studying?
Tuesday: Lab Tour Dont be late!
Thursday: Guest lecture
Glitch with IRIS software
Grades so far (slip of paper in lab notebooks)
Tentative schedule for upcoming labs
The purpose of any detector is to record the light collected by the telescope. All detectors
transform the incident radiation into a some other form to create a permanent record,
such as particles (photographic plates), molecules (eyes), or electr
Lab 6: Spectroscopy
The aim of this lab is to provide you with hands-on experience obtaining and analyzing
spectroscopic data. In this lab you will be using a spectrograph to obtain spectra for a pair
of calibration sources and the Sun. The procedure is t
AST 3722 (Week 1)
Lab 1: Introduction to the Campus Teaching Observatory
The first lab period will be used for an introduction to the Campus Teaching Observatory
(CTO), which will be used later in the semester for observing projects. A map to CTO,
AST 3722 HW #2: Signal-to-Noise
Due February 5, 2015
As we have discussed during lecture, the signal-to-noise ratio (SNR or S/N)
for an observation of an object, is dependent on the exposure time,
brightness of the object and the sky, read noise of the de
Lab 4: Optics and Telescopes
Telescopes are the fundamental tool by which astronomers obtain information about the
universe. While telescopes are no longer restricted to the optical regime, optical
telescopes still occupy a central role in astronomy and t
Essentially all coordinate systems in astronomy are
coordinate systems. Consider a unit sphere.
Coordinates and Time
the two angles,
coordinates by the
Ones location on the sphere is completely specified by
and , which c
So you have a great idea for a research project and you want to go
take some observations. Before requesting observing time,
there are some basic things that you need to consider:
-Lab tomorrow in
Exposure Times and Filters
M82 Supernova (RHO 30: Credit Amanda Townsend & Shuo Kong, Jan 22, 2014)
Reminder: Lab 2 due today.
Extension on observing proposals until Thursday.
No trip to RHO this week. Image credit: http:/www.astronomie.be/hambsch
Astronomy is a purely observational science.
Unlike physics, chemistry, genetics, or indeed all other sciences, you cant
experiment with stars and galaxies.
In the history of astronomy most breakthroughs have followed the introduction
of new observational
While convenient for breathing, the atmosphere is the single
biggest annoyance for observing.
Issues of particular importance:
Optics & Telescopes
The maximum resolution that can be achieved by any optical system is set by the diffraction limit. In a
sense, a telescope is the 2D analog to a single slit, and the diffraction pattern is an Airy disk. The
Spectroscopy provides a host of information not attainable from
broadening mechanisms (thermal, collisional, rotational)
Spectral types o
- Next Week:
Acquiring CCD Imaging Data
Observing: Groups 3,4,5
Telescopes Lab: Groups 1-2
- Telescope lab due date: Will be due the Monday after last group has lab
(so a bit of time from now)
- Processing and analyzing your data (mo
HW 1: Planning Observations for CTO
Due Tuesday, January 20
This assignment should be typed rather than handwritten, using the template provided for
the assignment, and each student should work independently.
The purpose of this exercise is t