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--- courses:phy100:4 [2023/11/14 23:20] – [2. Object selection] asad
+++ courses:phy100:4 [2023/11/14 23:44] (current) – asad
@@ Line 1: / Line 1: @@
 ====== 4. Imaging with Unistellar eQuinox ======
 https://www.unistellar.com/equinox2
-===== - Light pollution =====
-{{url>https://www.lightpollutionmap.info/#zoom=4.62&lat=38.3835&lon=-117.0602}}
 ===== - Object selection =====
-The very first thing an astronomer does as part of her observation is to select an 'interesting' astronomical object. We will do the same. What do I mean by 'interesting'? Well, you will decide that by yourself. I can only suggest 3 criteria for finding something interesting: **truth**, **beauty** and **order**. Select something orderly and beautiful and something that can help us get closer to the truth about our place in the universe. For selecting
+Select an astronomical object to image using https://telescopius.com.
-Go to https://telescopius.com/deep-sky-objects as shown below with numbered instructions.
 {{:courses:phy100:telescopius.webp?nolink&850|}}
 The numbers below follow the inset numbers given in the figure above.
-  - Targets: select Deep sky objects.
+  - Targets: select **Deep Sky**.
-  - Location and date: either select 'Use my current location' or enter the coordinates of Dhaka (lat 23.8, lon 90.4) manually. The date is here 17 Nov.
+  - **Location** and **date**: either select 'Use my current location' or enter the coordinates of Dhaka (lat 23.8, lon 90.4) manually. The date is here 17 Nov.
-  - Moon: the moon is in 'waxing crescent' phase, not very bright, which is good.
+  - Moon: the moon is in 'waxing crescent' **phase**, not very bright, which is good.
-  - Sunrise and sunset times, and the astronomical sunset (from when it is totally dark) times are given.
+  - Sunrise and sunset times, and the astronomical **sunset** (from when it is totally dark) times are given.
-  - Weather: average weather on this night is bad.; 'very bad' cloud condition and 'bad' seeing.
+  - **Weather**: average weather on this night is bad.; 'very bad' cloud condition and 'bad' seeing.
-  - Search parameters need to be set for selecting a sample of your desired targets. The target should be **visible** should be from around 6:30 pm (astronomical sunset) to 9 pm.
+  - Search parameters need to be set for selecting a sample of your desired targets. The target should be **visible** from around 6:30 pm (astronomical sunset) to 9 pm.
-  - Minimum altitude: the target should have a minimum height from the horizon of around 50 degrees for at least 15 minutes, so that we can take a picture when it is well above in the sky and close to our zenith.
+  - Minimum **altitude**: the target should have a minimum height from the horizon of around 50 degrees for at least 15 minutes, so that we can take a picture when it is well above in the sky and close to our **zenith**.
-  - Object type: select galaxy, globular cluster or interstellar matter.
+  - Object **type**: select galaxy, globular cluster or interstellar matter.
-  - Distance from the moon of the target should be at least 90 degrees.
+  - Distance from the **moon** of the target should be at least 90 degrees, as far as possible.
-  - Apparent magnitude of the target should be between 5 (barely visible with naked eye) and 10 (faint but observable with our telescope).
+  - Apparent magnitude (**brightness**) of the target should be between 5 (barely visible with naked eye) and 10 (faint but observable with our telescope).
-  - Apparent size of the target must be between 10 arcminutes and 40 arcminutes because the field of view of our telescope is around 40 arcminutes. The object should fit within the field of view, that is the frame of the picture.
+  - Apparent **size** of the target must be between 10 arcminutes and 40 arcminutes because the **field of view** of our telescope is around 40 arcminutes. The object should fit within the field of view, that is the **frame** of the picture.
+  - 7 results have been found with these filters, that is 7 galaxies to observe.
+  - The list can be sorted by various things, here sorted according to 'popularity' .
+  - M 110 is the first galaxy in the list. It is an elliptical galaxy, with an apparent size of 19 arcminutes ($19'$), apparent magnitude of 8.1, located in the Andromeda constellation.
+  - On 17 Nov, it will rise at 06:02 pm, reach its highest altitude at 08:50 pm and set at 11:48 pm.
+  - The track followed by the galaxy in our sky is shown here. Its maximum altitude from the horizon will be 72 degrees at 08:50 pm and it will be toward north during that time.
-==== - Transit time ====
+==== - Visibility ====
 The **visibility** has three numbers, the first one is the rising time, the second one the **transit** time, and the last one the setting time. The difference between the rising and setting time is usually around twelve hours, and the transit occurs when the object is right above our head, when the object reaches the highest position in the sky on a given night.
@@ Line 55: / Line 55: @@
 Our telescopes have FoVs of around 1 deg.
-==== - Magnitude ====
+==== - Brightness ====
 ===== - Observation =====