Question
Answer the following about reference frames used in astronomy, for 10 points each.
[10e] This adjective describes a "standard of rest" defined by the mean motion of objects within the solar neighborhood. This adjective also describes the group of galaxies that contains the Milky Way, Andromeda, and about 30 dwarf galaxies.
ANSWER: local [accept local standard of rest; accept local group]
[10h] Calculations of the local standard of rest must account for this phenomenon in which the local mean rotational velocity is smaller than the circular velocity at a given radius. It is often estimated using the Strömberg relation.
ANSWER: asymmetric drift
[10m] The velocity of the Earth with respect to the CMB varies on a scale of about 100 kilometers per second as a result of this component of the Earth's velocity caused by its orbit around the Milky Way. A galaxy's motion can be decomposed into two components, the Hubble flow and this component, an astronomical object's velocity relative to some rest frame.
ANSWER: peculiar velocity [or peculiar motion]
<Chen, Other Science>
Summary
| 2024 ESPN @ Brown | 04/06/2024 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ESPN @ Cambridge | 04/06/2024 | Y | 2 | 10.00 | 100% | 0% | 0% |
| 2024 ESPN @ Chicago | 03/23/2024 | Y | 6 | 10.00 | 100% | 0% | 0% |
| 2024 ESPN @ Columbia | 03/23/2024 | Y | 7 | 11.43 | 100% | 14% | 0% |
| 2024 ESPN @ Duke | 03/23/2024 | Y | 2 | 10.00 | 100% | 0% | 0% |
| 2024 ESPN @ Online | 06/01/2024 | Y | 3 | 10.00 | 100% | 0% | 0% |
Data
| Houston Junior College | Williams et al. | 10 | 0 | 0 | 10 |
| Riley et al. | Free-ish Agents | 10 | 0 | 0 | 10 |
| Tunks et al. | Cleo: 5/7 movie | 10 | 0 | 0 | 10 |