======================================================================
BAA electronic bulletin No. 00441 http://www.britastro.org/
======================================================================
On the night of Tuesday September 29, 5.3 magnitude 29 Cap (ZC 3108,
HIP 104974) will be 'grazed' by the moon along a line from south west
Cornwall to the E Riding of Yorkshire, over fairly populated areas.
This is track 9 in the 2009 BAA Handbook (pp.35-36). The track
crosses parts of S Cornwall, N Devon, SW Wales including Cardiff, the
central Midlands including Worcester and Birmingham, S Derbys, N Notts,
N Lincs, and the East Riding of Yorkshire. The star will be grazed by
the dark southern limb of the 82% sunlit moon. Observers north of the
line will see a total occultation, those south a miss.
The graze commences at around 2146 UT (2246 BST) at landfall in the
south west, where the moon will be at an elevation of 24 degrees, just
past the meridian. The graze takes place entirely against the dark
limb at a cusp angle of around 15 degrees. Apart from the relatively
low moon elevation, this is quite a favourable graze for observation.
The moon's predicted profile is very rugged at the graze point and
events should be seen from 5km NW to 4km SE of (perpendicular on the
ground to) the central track. Multiple events, where the star
disappears and reappears behind limb features, are possible within
the range 5km NW to 1km SE of the track. The graze should be easily
visible in small telescopes. The track departs the NE coast at 2154
UT (2254 BST) where the moon will be at 19 degrees elevation.
The track in greater detail, using a precision comparison with an OS
map and times:-
Crosses S coast between Fowey and Looe at 21:46:53 UT, crosses SE of
Liskeard, NW of Okehampton 21:48:30
Over Winkleigh, Chulmleigh, Molland, W Minehead, Barry, central
Cardiff, and between Newport/Cwmbran 21:50:00
Over Raglan, W Monmouth, and west of Ross-on-Wye, Ledbury, Great
Malvern and Worcester, central Droitwich, and Bromsgrove,
SE Birmingham, 21:51:26
Sutton Coldfield, W Tamworth, E Swadlincote, E of Derby, NW
Nottingham, 21:52:45
SE of Gainsborough and Scunthorpe, Brigg, E Kingston-upon-Hull,
leaving the coast at Aldbrough at 21:54:00 UT
N.B. the times stated above are for the centre of the graze.
Depending on the observer's position within the +/-5km perpendicular
to graze track, the graze may start and end up to 4 minutes either
side of the central times. Don't forget to add 1 hour to the above
UT times to get BST!
A detailed prediction, including OS map references for the track, an
'ASCII' representation of the moon's limb, and a detailed explanatory
note for these graze predictions (Microsoft Word format), are
available for download here:-
http://www.warton.f2s.com/Misc/29CapGraze09.txt
http://www.warton.f2s.com/Misc/GrazKey.doc
Because of the possibility of multiple events, observers wishing to
make serious visual timings (to better than 1 second) will need a
multi-lap stopwatch or a voice recorder linked to an accurate time
signal, as well as accurate geodetic coordinates. Those with
sensitive video cameras, camcorders or webcams may also be able to
record the events, but will need an accurate method of time-stamping
the video. Serious timings would be welcomed by the undersigned,
including any definite positive or negative results from just south
of the predicted zone. Accurate timings provide valuable scientific
data which can help to refine our knowledge of the moon's limb
profile, particularly now to check the altimeter results from the
recent lunar orbiters.
Clear Skies!
Andrew Elliott
Occultation Coordinator, Lunar Section
Email: ae [at] f2s [dot] com
======================================================================
BAA electronic bulletins service. E-mail: circadmin@britastro.org
Bulletin transmitted on Thu Sep 24 16:55:50 BST 2009
(c) 2009 British Astronomical Association http://www.britastro.org/
======================================================================
BAA electronic bulletin No. 00441 http://www.britastro.org/
======================================================================
On the night of Tuesday September 29, 5.3 magnitude 29 Cap (ZC 3108,
HIP 104974) will be 'grazed' by the moon along a line from south west
Cornwall to the E Riding of Yorkshire, over fairly populated areas.
This is track 9 in the 2009 BAA Handbook (pp.35-36). The track
crosses parts of S Cornwall, N Devon, SW Wales including Cardiff, the
central Midlands including Worcester and Birmingham, S Derbys, N Notts,
N Lincs, and the East Riding of Yorkshire. The star will be grazed by
the dark southern limb of the 82% sunlit moon. Observers north of the
line will see a total occultation, those south a miss.
The graze commences at around 2146 UT (2246 BST) at landfall in the
south west, where the moon will be at an elevation of 24 degrees, just
past the meridian. The graze takes place entirely against the dark
limb at a cusp angle of around 15 degrees. Apart from the relatively
low moon elevation, this is quite a favourable graze for observation.
The moon's predicted profile is very rugged at the graze point and
events should be seen from 5km NW to 4km SE of (perpendicular on the
ground to) the central track. Multiple events, where the star
disappears and reappears behind limb features, are possible within
the range 5km NW to 1km SE of the track. The graze should be easily
visible in small telescopes. The track departs the NE coast at 2154
UT (2254 BST) where the moon will be at 19 degrees elevation.
The track in greater detail, using a precision comparison with an OS
map and times:-
Crosses S coast between Fowey and Looe at 21:46:53 UT, crosses SE of
Liskeard, NW of Okehampton 21:48:30
Over Winkleigh, Chulmleigh, Molland, W Minehead, Barry, central
Cardiff, and between Newport/Cwmbran 21:50:00
Over Raglan, W Monmouth, and west of Ross-on-Wye, Ledbury, Great
Malvern and Worcester, central Droitwich, and Bromsgrove,
SE Birmingham, 21:51:26
Sutton Coldfield, W Tamworth, E Swadlincote, E of Derby, NW
Nottingham, 21:52:45
SE of Gainsborough and Scunthorpe, Brigg, E Kingston-upon-Hull,
leaving the coast at Aldbrough at 21:54:00 UT
N.B. the times stated above are for the centre of the graze.
Depending on the observer's position within the +/-5km perpendicular
to graze track, the graze may start and end up to 4 minutes either
side of the central times. Don't forget to add 1 hour to the above
UT times to get BST!
A detailed prediction, including OS map references for the track, an
'ASCII' representation of the moon's limb, and a detailed explanatory
note for these graze predictions (Microsoft Word format), are
available for download here:-
http://www.warton.f2s.com/Misc/29CapGraze09.txt
http://www.warton.f2s.com/Misc/GrazKey.doc
Because of the possibility of multiple events, observers wishing to
make serious visual timings (to better than 1 second) will need a
multi-lap stopwatch or a voice recorder linked to an accurate time
signal, as well as accurate geodetic coordinates. Those with
sensitive video cameras, camcorders or webcams may also be able to
record the events, but will need an accurate method of time-stamping
the video. Serious timings would be welcomed by the undersigned,
including any definite positive or negative results from just south
of the predicted zone. Accurate timings provide valuable scientific
data which can help to refine our knowledge of the moon's limb
profile, particularly now to check the altimeter results from the
recent lunar orbiters.
Clear Skies!
Andrew Elliott
Occultation Coordinator, Lunar Section
Email: ae [at] f2s [dot] com
======================================================================
BAA electronic bulletins service. E-mail: circadmin@britastro.org
Bulletin transmitted on Thu Sep 24 16:55:50 BST 2009
(c) 2009 British Astronomical Association http://www.britastro.org/
======================================================================
--
Good Clear Skies
--
Astrocomet
--
Colin James Watling
--
Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)
--
Web: http://lyra.freewebsites.com/
Good Clear Skies
--
Astrocomet
--
Colin James Watling
--
Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)
--
Web: http://lyra.freewebsites.com/
No comments:
Post a Comment