木星、土星、火星拍摄
- 木星
Keep histogram level around 80-90% on all channels.
Keep total integration time below2 minutes.
Use focal length of around 30X of your aperture 5 micron pixel cameras and 20X the aperture for 3.75 micron cameras. - 土星
Saturn has very low surface brightness.
Use 100% gain and variable frame rate.
Use 50% histogram level for red and green and 30% for blue.
Use Winjupos Derotation so that the final image will be smooth.
Keep total integration time to around 3 minutes. 火星
Use focal length around 50X the aperture for 5 micron pixel cameras and 30X the aperture for 3.75 micron cameras.
Keep histogram level of the Red Channel at around 80-90%. Keep Green at around 60-70% and Blue around 30-40%.
Total integration time can be as long as 4 minutes.
UV-IR should be blocked to get true colors. Make sure
your blue channel has no IR leakage.另一参数
Jupiter - The Red, Green and Blue channels should reach ~80-90% on the histogram
Saturn - Red channel should be at ~70%, Green ~50% and Blue ~25-30%
Mars - Settings as per Saturn
各大行星拍摄时间
| Object | Focal Length | Capture Time | Notes |
|---|---|---|---|
| Mercury | Under 10m | Any (1-2 mins+) | In white light, there are very minor albedo features and the rotation rate is slow, so even with a near-IR filter, capture time is irrelevant. |
| Over 10m | Any (1-2 mins+) | As above | |
| Venus | Under 10m | Any (1-2 mins+) | In white light, there are no albedo features so capture time is irrelevant. Even with a UV filter to show cloud details, the rotation rate is slow enough that capture time is irrelevant. |
| Over 10m | Any (1-2 mins+) | As above | |
| Mars | Under 10m | 2-3 mins per channel | There will be some rotation from the start of the red channel to the end of the blue channel. |
| Over 10m | 1-2 mins per channel | As above | |
| Jupiter | Under 10m | 1 minute per channel | There will be some rotation from the start of the red channel to the end of the blue channel |
| Over 10m | 40 secs per channel | As above | |
| Saturn | Under 10m | Any (1-2 mins+) | If there is a storm visible at the time, keep your captures to about 1 minute per channel.. Otherwise there are no surface albedo features so capture time is irrelevant. Saturn really benefits from lots of frames to get a smoother globe. |
| Over 10m | Any (1-2 mins+) | As above | |
| Uranus | Under 10m | Any (1-2 mins+) | Rare to see any albedo features, and at a small focal length it won’t be much more than a small green dot anyway. |
| Over 10m | Any (1-2 mins+) | As above. | |
| Neptune | Under 10m | Any (1-2 mins+) | No albedo features, so capture time is irrelevant. At short focal lengths it will just be a blue/green dot. |
| Over 10m | Any (1-2 mins+) | As above. |
行星自传周期及拍摄时间
- Mercury – Rotational period 58.6 days. No practical limit to length of captures or number of datasets. Generally you only need IR as you will not be looking to bring out colour but rather attempting to show phases and surface detail, you will however need lots of IR captures for stacking.
- Venus - Rotational period 243 days. No practical limit to length of captures, however if imaging cloud structures in UV you may want to restrict to a few minutes especially as image brightness tends to be quite dim in this wavelength. In other wavelengths Venus is so bright that time limit shouldn’t be a factor anyway. Generally IR will suffice and if you want to reveal cloud structures IR & UV.
- Mars - Rotational period 24.6 hrs. Time will vary with the apparent size of Mars as it presents very differently when it is at opposition compared to when it is further away from us on its journey around the Sun. At opposition I would suggest limiting each capture to a maximum of 90 seconds.
- Jupiter - Rotational period 9.9 hrs. Try to keep individual captures below 60 seconds, preferably around 45 seconds. As Jupiter presents as a bright target in IR, red, green and blue wavelengths you should still be able to capture a large number of frames at a reasonable frame rate within these limits.
- Saturn - Rotational period 10.6 hrs. Saturn has a lower surface brightness than Jupiter when imaging at long focal lengths so exposure times will have to be longer resulting in it taking more time to capture a decent number of frames. I’d suggest limiting capture times to 120 seconds if conditions allow.
- Uranus - Rotational period 17.9 hrs. Unless you are imaging at a very long focal length with a large scope it is unlikely that you will be lucky enough to capture detail within the atmosphere of Uranus so rotation limits are pretty academic. Also the planet will present as a small dim target so you will be imaging at high gain. In this case the more frames the better.
- Neptune – Rotational period 19.1 hrs. See advice for Uranus.
ref：
https://www.thelondonastronomer.com/it-is-rocket-science/2018/6/7/a-quick-guide-to-planetary-imaging
http://www.iceinspace.com.au/index.php?id=63,468,0,0,1,0
http://www.ajax.ehu.es/Juno_amateur_workshop/talks/02_03_ImagingWorkflow_Christopher_Go.pdf
大火流兮 于 2020-12-25 16:25 修改