For the rest, this is the most important part of that blog:
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A few pointers before we look at the data extracted from WinJUPOS:
(1) For the month of October in Singapore, Jupiter rises above the horizon at about 1:41 am on 1 October. It rises earlier and earlier everyday and by 31 October, rises at about 11:52pm.
(2) Under clear sky conditions, it is possible to observe Jupiter until at least 7am in Singapore in October. Of course, pre-dawn dark sky is more preferable compared to the brighter bluish twilight skies.
(3) If the shadow transits happens when Jupiter is high up in the dark sky, the view will be potentially clearer and less distorted assuming everything else remain the same.
(4) Shadows that are very near the edges of Jupiter may be difficult to spot due to curvature of spherical object like Jupiter.
Multiple Shadow Transits on Jupiter in October 2013 in Universal Time (UT)
(Credit: WinJUPOS 10.0.21)
2013/10/01 13:42 - 14:07
2013/10/05 02:39 - 03:24
2013/10/08 15:35 - 16:43
2013/10/12 03:25 - 06:01 (triple shadow transits!)
2013/10/15 17:28 - 19:20
2013/10/17 11:57 - 13:28
2013/10/19 06:25 - 08:38
2013/10/22 19:22 - 21:34
2013/10/24 14:30 - 16:03
2013/10/26 08:37 - 10:31
2013/10/29 21:56 - 23:28
Converting these timings to Singapore Standard Time (+8 UT) (Visible from Singapore =Yes/No):
Tue -- 01 Oct -- 21:42 -- 22:07 -- [No]
Sat -- 05 Oct -- 10:39 -- 11:24 -- [No]
Tue -- 08 Oct -- 23:35 -- 24:43 -- [No]
Sat -- 12 Oct -- 11:25 -- 14:01 -- [Triple!] [No! Oh-No]
Wed -- 16 Oct -- 01:28 -- 03:20 -- [Yes] - [Duration = 1hr 52min]
Thu -- 17 Oct -- 19:57 -- 21:28 -- [No]
Sat -- 19 Oct -- 14:25 -- 16:38 -- [No]
Wed -- 23 Oct -- 03:22 -- 05:34 -- [Yes] - [Duration = 2hr 12min]
Thu -- 24 Oct -- 22:30 -- 24:03 -- [No]
Sat -- 26 Oct -- 16:37 -- 18:31 -- [No]
Wed -- 30 Oct -- 05:56 -- 07:28 -- [Yes] - [Duration = 1hr 32min]
Some implications from these multiple shadow transit data for October 2013:
(1) Super rare Triple Shadow Transit on 12 October not visible from Singapore! So if you really keen to see this, plan to go overseas to the other side of Earth in advance!
(2) Three double shadow transits visible in Singapore - 16th , 23rd and 30th. Three chances to catch at least one of them.
(3) All three double shadow transits falls on a Wednesday early morning before sunrise. Easy to remember - last three Wednesdays of October.
(4) To be able to see Jupiter's Great "Red" Spot (GRS) during multiple shadow transits is a rare visual bonus. Unfortunately, GRS is not visible for these shadow transits visible in Singapore.
(5) 15 Oct is a public holiday (Hari Raya Haji). Get plenty of sleep on that day so you can stay awake for the shadow transits on early morning of 16th.
(6) Duration of multiple shadow transits can be very short - e.g. one egressing out of Jupiter a few minutes after the ingress of the other. For these shadow transits in October 2013, they are much longer on average - more than one hour! Plenty of time to observe with diferent telescopes and accessories, take photos/videos and socialise with other stargazers!
Here are some screen captures from WinJUPOS showing some interesting framing for visual or imaging purposes during these three shadow transit periods:
Wed 16 Oct 2013
Wed 23 Oct 2013
Wed 30 Oct 2013
I will provide more details in October closer to these shadow transit dates. In the meantime, you may use your favourite planetarium software or phone app to find more detailed information - e.g. each moon/shadow exact ingress and egress timings. Now that you have plenty of time to prepare yourself to witness these celestial wonders, go get a telescope soon or befriend an amateur astronomer!
