ASTR 210 Problem Set 07: Technical Observing Report

Assemble a defensible observing argument from the term’s measurements and their uncertainties.

Problems

1. Combined uncertainty 15 points

A calibrated magnitude has zero-point uncertainty ±0.03 mag and instrumental uncertainty ±0.02 mag. Compute the combined uncertainty.

2. Claim strength critique 15 points

A draft report states "we present a definitive detection" for a source measured at SNR = 4.2. Critique this claim using the SNR-classification rule from Lecture 4, and propose more accurate wording.

3. Report-section sorting 15 points

Sort the following three sentences into Methods, Results, or Limitations: (a) "Bias and dark frames were taken at the start and end of the night." (b) "The comparison star’s stability was verified only for this single night." (c) "The target’s calibrated magnitude is 14.02 ± 0.04."

4. Final synthesis 15 points

Using the combined uncertainty from Problem 1 and the magnitude m = 14.02, write one complete, defensible result sentence for a technical observing report, including the measurement, its uncertainty, and one explicitly stated limitation.

Due and Scope

Submit a clear solution with equations, units, labeled quantities, and a short narrative interpretation for each problem. Show every reduction step and state your assumptions explicitly; a correct final number without visible work receives partial credit at most.

OpenStax Companion Reading

Verify against OpenStax Astronomy 2e Chapter 1.3 (scientific reasoning and communication) before instructional release.

References and Data Sources