# Assessment Instructions: Problem Set 06 — A Hohmann Transfer to Venus and the Sun-Earth vs. Sun-Jupiter L1 Points

## Inputs to Inspect
Student submission, this problem set, the solution key, the corresponding lecture slides/notes, and the referenced dataset(s) under `materials/ASTR310/data/`.

## Grading Standard
Award credit for correct method and units first, then for the specific numeric result. A student who shows correct reasoning with a small arithmetic slip should receive most of the available credit; a student with a correct-looking number but no visible derivation steps should not. Because this is a 300-level quantitative course, full marks require a genuine derivation (not just formula substitution) wherever the problem set asks for one.

## Problem-Level Criteria
- Problem 1: 15 points — correct transfer semimajor axis and perihelion/aphelion identification.
- Problem 2: 20 points — correct vis-viva arithmetic at both transfer points and correct total Δv.
- Problem 3: 15 points — correct transfer-time arithmetic and correct comparison.
- Problem 4: 20 points — correct Sun-Jupiter L1 arithmetic and correct combined-scaling explanation.

## Resubmission Policy
Students may resubmit within one week of receiving feedback. A resubmission must show a corrected derivation, not only a corrected final number, and should reference the specific feedback comment it addresses. Regrade to a maximum of 90% of the original point value unless the error was a grading mistake.

## Common Errors to Flag
- Reversing which orbit (Earth’s or Venus’s) is the transfer-orbit perihelion versus aphelion for an inward transfer.
- Forgetting the cube-root mass-ratio scaling and attributing the Sun-Jupiter/Sun-Earth L1 ratio to orbital radius alone.
- Using inconsistent units (AU vs. km) when comparing the two L1 distances.