2020-07-18, 10:39 PM
By observable, are you saying that the "Best Now" mode will show all objects above the horizon when all the filters are turned off? If so, this is not the result that I am getting.
I went back and simulated the Veil example mentioned in my last post by manually setting the PC clock and comparing results from ST3 to ST4. I used an observing list of 70 objects (the 2019 TSP Smoke & Mirrors) I've double checked everything, reset all filters, check the observing location, made sure the mode is in "Best Now", refreshed the list multiple times and reset the filters multiple times. I made sure that Quality was set to "Any" and Difficulty was set to "Ignore Difficulty". While carefully checking everything I did notice the sky brightness for the location was originally set to 20.6 mag/arsecsqr. This does make a difference in the results. I was assuming that by turning the Quality and Difficulty filters off that the sky brightness would not come into play. I changed the sky brightness to Bortle 1 or 22 mag/arsecsqr and got the results below.
ST3 is set to "Above Horizon Only" and ST4 set to "Best Now". All filters are turned off and the sky brightness in ST4 is set to Bortle 1. The telescope aperture is 14" and I forced myself to be an 18 year old observer with a 6.9 mm pupil size. I used tonight as the date and set the time manually to 11:00 PM and 12:00 AM. The 11:00 PM time is and 1hr 4 minutes past the end of astronomical twilight (according the ST4). I'm using ST4 V4.0h.
At 11:00 PM .... ST3 shows 59 out of 70 objects and the Veil at 48 degrees. ST4 shows 40 out of 70 objects and the Veil (west) is not shown on the list.
At 12:00 AM .... ST3 shows 57 out of 70 objects and the Veil at 60 degrees. ST4 shows 30 out of 70 objects and the Veil now shows on the list.
When I had the sky brightness set to 20.6 the Veil would not show up on the ST4 list until 1:00 AM at an altitude of 72 degrees and I got smaller numbers in the available objects shown on the ST4 list.
I did not repeat the experiment with the bright stars case I mentioned in my last post but I can if you like.
I have learned that I need to be careful setting the sky brightness in real time mode as it still comes into play even when you have the Quality and Difficulty filters turned off.
Sorry to bother you so much.... What am I doing wrong here?
Bill
I went back and simulated the Veil example mentioned in my last post by manually setting the PC clock and comparing results from ST3 to ST4. I used an observing list of 70 objects (the 2019 TSP Smoke & Mirrors) I've double checked everything, reset all filters, check the observing location, made sure the mode is in "Best Now", refreshed the list multiple times and reset the filters multiple times. I made sure that Quality was set to "Any" and Difficulty was set to "Ignore Difficulty". While carefully checking everything I did notice the sky brightness for the location was originally set to 20.6 mag/arsecsqr. This does make a difference in the results. I was assuming that by turning the Quality and Difficulty filters off that the sky brightness would not come into play. I changed the sky brightness to Bortle 1 or 22 mag/arsecsqr and got the results below.
ST3 is set to "Above Horizon Only" and ST4 set to "Best Now". All filters are turned off and the sky brightness in ST4 is set to Bortle 1. The telescope aperture is 14" and I forced myself to be an 18 year old observer with a 6.9 mm pupil size. I used tonight as the date and set the time manually to 11:00 PM and 12:00 AM. The 11:00 PM time is and 1hr 4 minutes past the end of astronomical twilight (according the ST4). I'm using ST4 V4.0h.
At 11:00 PM .... ST3 shows 59 out of 70 objects and the Veil at 48 degrees. ST4 shows 40 out of 70 objects and the Veil (west) is not shown on the list.
At 12:00 AM .... ST3 shows 57 out of 70 objects and the Veil at 60 degrees. ST4 shows 30 out of 70 objects and the Veil now shows on the list.
When I had the sky brightness set to 20.6 the Veil would not show up on the ST4 list until 1:00 AM at an altitude of 72 degrees and I got smaller numbers in the available objects shown on the ST4 list.
I did not repeat the experiment with the bright stars case I mentioned in my last post but I can if you like.
I have learned that I need to be careful setting the sky brightness in real time mode as it still comes into play even when you have the Quality and Difficulty filters turned off.
Sorry to bother you so much.... What am I doing wrong here?
Bill