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Thu, 12 Jul 2012


Moon hides Jupiter on Sunday morning


Jupiter Graze Map.gif
The graze track of Jupiter across the UK. Click to enlarge

A rare lunar occultation of Jupiter takes place this coming Sunday morning, 15 July, starting at about 2.50 am BST – so you’ll have to stay up on Saturday night! The Moon will be low down in the east north east, so you will need a good low horizon in that direction, as well, of course as good weather!

The event will only be seen south of a line running roughly from South Wales to Lincolnshire. For many people Jupiter will just graze the lunar limb, giving a very interesting appearance, while farther south of a line between Dorset and Suffolk Jupiter will be fully hidden for a time. The map at right shows these two lines.

Jupiter’s satellites will also take part in the event, and each one has its own graze track across the UK, south of which it will be completely hidden.

As seen from Greenwich, the event starts at 01.51 UT (2.52 am BST) with Europa, followed by Io and then Jupiter itself at 01.56 UT. Other timings from Greenwich are shown in the table below. Timings for other locations will be just a minute or two different from these.

The event will be worth watching from the whole of the UK, though north of the line Jupiter will not be hidden by the Moon at all. The simulations shown here are from the free occultation software LOW, which will give you precise predictions for your own location should you need them, and the ground tracks from Occult 4.

Information provided by Mell Jeffery, Occultation Section Director

Graze line for Io. Click to enlarge Graze line for Europa. Click to enlarge
Graze line for Ganymede. Click to enlarge Graze line for Callisto. Click to enlarge
Disappearance Greenwich.JPG
Simulation of disappearance from Greenwich Simulation of reappearance from Greenwich

Simulation of mid-event from Cardiff

Click any image to enlarge

Date

Z.C.
No.

STAR/OBJECT NAME

Mag

Ph

Data for Greenwich

Time UT

Alt

Az

PA

 

Data for Edinburgh

Time UT

Alt

Az

PA

 

 

 

15 July

 

Europa

5.9

DB

01h 51m

8

66

3

Appulse only for these Jupiter events.

 

15 July

 

Io

5.6

DB

01h 55m

8

67

1

 

15 July

 

Jupiter

-1.9

DB

01h 56m

8

67

3

 

15 July

 

Ganymede

5.2

DB

02h 01m

9

68

5

 

15 July

 

Europa

5.9

RD

02h 04m

9

68

337

 

15 July

 

Callisto

6.2

DB

02h 05m

9

69

7

 

15 July

 

Io

5.6

RD

02h 06m

10

69

340

 

15 July

 

Jupiter

-1.9

RD

02h 09m

10

69

338

 

15 July

 

Ganymede

5.2

RD

02h 16m

11

71

336

 

15 July

 

Callisto

6.2

RD

02h 21m

12

72

334

 

Added by: Robin Scagell