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photometry

This tag is associated with 11 posts

UR #15: Colors of Quasars

How can the colors of objects tell you how far away they are? The subject of this month’s undergrad research post tells us about his work determining the colors of quasars.

Albedo as a quick proxy for asteroid compositions

Obtaining high-resolution spectra of asteroids is challenging. Measuring asteroid albedos in broad photometric wavebands is relatively easy, and potentially provides useful information about surface composition.

A Century of Staring at the Sky: Constraints on Star-Planet Interactions from the DASCH project

Caption: H. A. Sawyer loading plates into the Harvard 16” Metcalf Doublet telescope. Picture from http://hea-www.harvard.edu/DASCH/telescopes.php Paper Title: 100-year DASCH Light Curves of Kepler Planet-Candidate Host Stars Authors: S. Tang et al First Author’s Affiliation: Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Kavli Institute for Theoretical Physics, Santa Barbara, CA; California Institute of Technology, Pasadena, CA […]

Sgr A*: A flickering black hole

Witzel et. al examine the statistical properties of the photometric variability of our Galaxy’s central black hole.

Figure 2

The Study of Climate on Alien Worlds

“Characterizing atmospheres beyond the Solar System is an endeavor no longer confined to the realm of science fiction.”

NGC 4261′s off-kilter globular cluster population

We think many galaxies we see today had mergers and interactions in their past, but how can we know for sure? Bonfini et al. look to evidence from a subtle pattern in the distribution of globular clusters in NGC 4261.

An asteroid rotation factory

Title: Asteroid rotation periods from the Palomar Transient Factory survey Authors: D. Polishook, E. O. Ofek, A. Waszczak, S. R. Kulkarni, A. Gal-Yam, O. Aharonson, R. Laher, J. Surace, C. Klein, J. Bloom, N. Brosch, D. Prialnik, C. Grillmair et al. First Author’s Institution: Benoziyo Center for Astrophysics, Weizmann Institute of Science, Israel Determination of […]

How do astronomers measure the brightness of something?

Sounds like a simple question. When you go out and look at the stars at night with your naked eye, you might be able to pretty easily sort out which stars are the brightest, which are the faintest, and come up with some ranking of them for those in between. Now, do this with telescopes…