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--- courses:phy100:4 [2023/11/14 23:40] – [1. Object selection] asad
+++ courses:phy100:4 [2023/11/14 23:44] (current) – asad
@@ Line 3: / Line 3: @@
 ===== - 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.
   - Moon: the moon is in 'waxing crescent' **phase**, not very bright, which is good.
@@ Line 27: / Line 25: @@
   - 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.
-===== - Light pollution =====
+==== - Visibility ====
-{{url>https://www.lightpollutionmap.info/#zoom=4.62&lat=38.3835&lon=-117.0602}}
-==== - Transit time ====
 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.
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 Our telescopes have FoVs of around 1 deg.
-==== - Magnitude ====
+==== - Brightness ====
 ===== - Observation =====