# “What was that spot in the sky?” - How to identify satellites

First of all sorry for my immense ignorance in this matter and for all the stupid things I'll say here.

Yesterday, May 22th 2017, I removed the telescope from its dusty box1 and decided to watch Jupiter. After about 2 minutes of observation I spotted something across the sky [X-files music in background], it was a little less bright as Jupiter's "Galilean" moons2

Below you can se an accurate [Windows Paint] reconstuction of the fact I saw in my telescope. The red line indicates the direction of the thing (from right to left outside of the telescope).

Available data to help identify the object:

Time: May 22th, 2017 @ 22:12 UTC
My position: {
Lat: 41.720194062015096
Long: 12.713427287843729
Sea level: 540 m
}
Direction: Probably South // The direction of Jupiter from that location at that time (did't had a compass)
Telescope: {
Focal length: 700 mm
Diameter: 60 mm
Lens: H 20 mm
}


I only have data of the ISS and Iridium insights on an Android app3 so I am here to ask if there is some tool with which I can identify by myself as much satellites as possible across the sky.

Notes:

1. Winter is not nice with observers from here
2. Not visible at naked eye
3. I can almost certainly say that the "thing" was not teh ISS or one of the Iridium satellites

P.s: I will post here what the object was (with reference if possible) as soon as I identify it for curiouses like me.

• One curious thing, checking the Heavens above site, Jupiter was quite well down in the SW at that time, so a LEO satellite would not have been in the sun at that time, in that direction. That would make it a lot dimmer than Jupiter's moons. – James K May 23 '17 at 21:25

• Thank you so much!! The clock I use is only 5s late on the official GMT (I use time.is/GMT as a reference) so, combining your link with in-the-sky.org I can say...well, nothing! The most possible satellite from your reference could be SL-16 R/B but it isn't since it was on my location at about 90 deg at 22:05 UTC --- Two things that would help me are: 1) could you kindly indicate on my image where is the north? 2) What is the field of view of my telescope? – Cliff Burton May 29 '17 at 11:35
• I just calculated the field of view of my telescope as 1.1 deg I hope I'm right!! And staring at Jupiter with 4 deg for 5 minutes from 22:10 UTC to 22:15 UTC nothing else passed on screen so I can say that it was a classified telescope at 100%! ...that's a joke, it is possible but the fact that there is no official non-classified satellites tracker makes it possible at any location in every single moment (I suppose). – Cliff Burton May 29 '17 at 11:43