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(IAAC) FWD: Naked-eye occultation tomorrow evening



         Camcorder Occultation Saturday Evening, December 6
     Basic local-time predictions are given below for about 200 North 
American cities for tomorrow evening's possibly naked-eye occultation of 
the 3.7-magnitude red star lambda Aquarii, visible from most locations 
in North America east of the Rocky Mountains (and with telescopes 
shortly BEFORE sunset west of them).  Please copy this message to others
you know who might be interested in watching this spectacular event.
More detailed predictions (giving other conditions, altitude and azimuth, 
PA, a and b factors, etc., and an explanation of these quantities) are 
given on IOTA's Web site at http://www.sky.net/~robinson/iotandx.htm, but 
the basic information below is all that is really needed by nearly everyone.  
Also to be posted on our Web site this evening will be U.T. predictions for 
IOTA stations across North America; those will be sent by e-mail upon 
request.  A Moonview showing the path of the star behind the Moon is 
also given there for many North American cities.  A spectacular grazing 
occultation, with multiple disappearances of the star, will be visible 
within about 2 miles of the southern limit of the occultation, which 
crosses Florida approximately from Bradenton to Titusville.  There will 
be IOTA expeditions to observe it near both those cities, and also south 
of Orlando.  Some details of those efforts are on our Web site, and will 
be distributed this evening; anyone is invited to join them to help 
record the southern lunar pole profile in as much detail as possible 
(the detail obtained is proportional to the number of observers who can 
record it, as is the case also for the profile of the Moon determined 
from the main occultation disappearance across North America). 
     The star will disappear behind the dark edge of the first quarter 
Moon, which will be high above the southwestern horizon.  If conditions 
are good, the event might even be seen without optical aid.  But 
binoculars are recommended for a good view.  Recording WWV shortwave 
time signals at 5 or 10 megahertz and the occultation with a camcorder 
can time the event to 0.03 second, which defines the star's position 
relative to the Moon's limb to about 30 meters accuracy, better than the 
Clementine spacecraft lunar laser altimeter measurements.  These 
observations are valuable for defining the lunar profile, information 
needed to properly analyze solar eclipse observations to determine 
climatically significant solar radius variations.  Wherever you are, it 
would be valuable if you can take a few moments to step outside and tape 
the occultation with a camcorder.  We will use CNN Headline News rather 
than The Weather Channel for the TV time reference station.  If you have 
neither WWV nor cable, call the U.S. Naval Observatory master clock at 
900-410-8463; the call should be placed via AT&T to ensure use of land 
lines, which will give an accuracy of a few hundredths of a second, more 
than sufficient for visual timings.  If the call is not made via AT&T, 
or if the National Bureau of Standards' WWV 303-area-code number are 
used, the call might (or might not, you would not know) be routed 
through a geosynchronous satellite, causing a quarter-second delay, 
which is unacceptable, even for visual timings. 
Occultation Predictions of lambda Aquarii on 1997 December 6 evening
Moon: % illumination  47+, solar elongation  86
Disappearance                      
                 Local Time     Sun
Location         h  m  s        Alt
Abilene TX       5 37 38 pm CST  -2
Akron OH         7 18 48 pm EST    
Albany NY        7 32 09 pm EST    
Allentown PA     7 30 45 pm EST    
Altoona PA       7 25 06 pm EST    
Amarillo TX      5 35 13 pm CST  -1
AnnArbor MI      7 14 19 pm EST    
Asheville NC     7 19 32 pm EST    
Ashland KY       7 17 28 pm EST    
Atlanta GA       7 16 18 pm EST    
AtlanticCity NJ  7 34 10 pm EST    
Augusta GA       7 23 32 pm EST    
Augusta ME       7 37 12 pm EST    
Austin TX        5 41 29 pm CST  -3
Baltimore MD     7 29 45 pm EST    
Bangor ME        7 38 17 pm EST    
Baton Rouge LA   5 59 28 pm CST -12
Battle Creek MI  7 11 39 pm EST    
Bay City MI      7 14 02 pm EST    
Beaumont TX      5 51 15 pm CST  -8
Belleville ON    7 25 02 pm EST    
Bethlehem PA     7 30 55 pm EST    
Billings MT      4 38 18 pm MST  -2
Biloxi MS        6 06 31 pm CST    
Binghamton NY    7 28 44 pm EST    
Birmingham AL    6 10 03 pm CST    
Bismarck ND      5 49 52 pm CST  -9
Bloomington IL   6 04 14 pm CST    
Boston MA        7 37 06 pm EST    
BowlingGreen KY  6 09 33 pm CST    
Brandon MB       5 54 32 pm CST -11
Brantford ON     7 20 27 pm EST    
Brattleboro VT   7 34 01 pm EST    
Bridgeport CT    7 34 32 pm EST    
Brockton MA      7 37 29 pm EST    
Brownsville TX   5 42 26 pm CST  -2
Buffalo NY       7 23 01 pm EST    
Burlington ON    7 21 12 pm EST    
Burlington VT    7 31 40 pm EST    
Calgary AB       4 41 09 pm MST  -2
Cambridge MA     7 37 00 pm EST    
Camden NJ        7 32 09 pm EST    
Canton OH        7 19 10 pm EST    
Cedar Rapids IA  5 59 49 pm CST    
CentralIslip NY  7 35 00 pm EST    
Champaign IL     6 05 38 pm CST    
Charleston SC    7 30 58 pm EST    
Charleston WV    7 19 43 pm EST    
Charlotte NC     7 24 11 pm EST    
CharlottetownPE  8 44 37 pm AST    
Chattanooga TN   7 12 58 pm EST    
Cheyenne WY      4 36 43 pm MST  -2
Chicago IL       6 07 04 pm CST    
Churchill MB     6 09 16 pm CST    
Cincinnati OH    7 13 20 pm EST    
Cleveland OH     7 18 19 pm EST    
Columbia MO      5 57 10 pm CST    
Columbia SC      7 25 24 pm EST    
Columbus GA      7 16 04 pm EST    
Columbus OH      7 16 12 pm EST    
Concord NH       7 35 26 pm EST    
Crps Christi TX  5 42 16 pm CST  -2
Dallas TX        5 44 43 pm CST  -5
Dartmouth NS     8 46 09 pm AST    
Davenport IA     6 01 37 pm CST    
Dayton OH        6 13 51 pm CST    
DaytonaBeach FL  7 38 49 pm EST    
Decatur IL       6 04 11 pm CST    
Denver CO        4 34 38 pm MST  -1
Des Moines IA    5 56 06 pm CST    
Detroit MI       7 15 36 pm EST    
Dodge City KS    5 41 09 pm CST  -4
Dubuque IA       6 01 51 pm CST    
Duluth MN        6 02 06 pm CST    
Durham NC        7 28 10 pm EST    
Eau Claire WI    6 01 46 pm CST    
Edmonton AB      4 46 08 pm MST  -4
Elizabeth NJ     7 33 08 pm EST    
Enid OK          5 44 17 pm CST  -6
Erie PA          7 21 09 pm EST    
Evansville IN    6 06 58 pm CST    
Fall River MA    7 37 45 pm EST    
Fargo ND         5 55 29 pm CST    
Flint MI         7 14 19 pm EST    
Fort Wayne IN    7 11 47 pm EST    
Fort Worth TX    5 43 26 pm CST  -5
Fredericton NB   8 40 11 pm AST    
FtSmith AR       5 51 16 pm CST  -9
Gadsden AL       6 11 51 pm CST    
Gainesville FL   7 30 50 pm EST    
Galveston TX     5 49 30 pm CST  -7
Gary IN          6 07 39 pm CST    
Grand Rapids MI  7 10 49 pm EST    
Great Falls MT   4 37 45 pm MST  -1
Green Bay WI     6 07 12 pm CST    
Greensboro NC    7 25 52 pm EST    
Greenville SC    7 20 33 pm EST    
Guelph ON        7 20 21 pm EST    
Gulfport MS      6 05 51 pm CST    
Halifax NS       8 46 09 pm AST    
Hamilton OH      7 13 09 pm EST    
Hamilton ON      7 21 06 pm EST    
Harrisburg PA    7 28 18 pm EST    
Hartford CT      7 34 52 pm EST    
Holyoke MA       7 34 35 pm EST    
Houston TX       5 47 46 pm CST  -6
Hull PQ          7 27 07 pm EST    
Huntington WV    7 17 55 pm EST    
Huntsville AL    6 09 53 pm CST    
Indianapolis IN  7 09 51 pm EST    
Iowa City IA     5 59 54 pm CST    
Jackson MI       7 13 05 pm EST    
Jackson MS       6 01 29 pm CST    
Jacksonville FL  7 31 17 pm EST    
Jersey City NJ   7 33 21 pm EST    
Johnstown PA     7 24 12 pm EST    
Joplin MO        5 51 46 pm CST -10
Kalamazoo MI     7 10 56 pm EST    
Kansas City KS   5 52 41 pm CST -11
Kansas City MO   5 52 46 pm CST -11
Kenosha WI       6 06 57 pm CST    
Kingston ON      7 26 30 pm EST    
Kitchener ON     7 19 58 pm EST    
Knoxville TN     7 15 49 pm EST    
La Salle PQ      7 30 20 pm EST    
Lafayette IN     7 08 21 pm EST    
Lancaster PA     7 29 36 pm EST    
Lansing MI       7 12 48 pm EST    
Laval PQ         7 30 07 pm EST    
Lawrence MA      7 36 34 pm EST    
Lethbridge AB    4 39 56 pm MST  -2
Lexington KY     7 13 37 pm EST    
Lima OH          7 13 52 pm EST    
Lincoln NE       5 50 02 pm CST  -9
Little Rock AR   5 56 04 pm CST -12
London ON        7 18 46 pm EST    
Lorain OH        7 17 25 pm EST    
Louisville KY    7 10 50 pm EST    
Lowell MA        7 36 22 pm EST    
Macon GA         7 19 36 pm EST    
Madison WI       6 04 21 pm CST    
Manchester NH    7 35 46 pm EST    
Marshall TX      5 50 33 pm CST  -8
Memphis TN       6 01 23 pm CST    
Meriden CT       7 34 52 pm EST    
Milwaukee WI     6 06 57 pm CST    
Minneapolis MN   5 59 04 pm CST    
Minot ND         5 50 56 pm CST  -9
Mississauga ON   7 21 30 pm EST    
Mobile AL        6 08 51 pm CST    
Moline IL        6 01 44 pm CST    
Moncton NB       8 42 36 pm AST    
Montgomery AL    6 12 15 pm CST    
Montpelier VT    7 32 52 pm EST    
Montreal PQ      7 30 26 pm EST    
Moose Jaw SK     5 48 50 pm CST  -7
Muncie IN        7 11 23 pm EST    
Nashville TN     6 08 57 pm CST    
Natchez MS       5 58 26 pm CST -12
New Bedford MA   7 38 15 pm EST    
New Britain CT   7 34 46 pm EST    
New Haven CT     7 34 53 pm EST    
New Orleans LA   6 03 11 pm CST    
New York NY      7 33 28 pm EST    
Newark NJ        7 33 08 pm EST    
NiagaraFalls NY  7 22 36 pm EST    
NiagaraFalls ON  7 22 35 pm EST    
Norfolk VA       7 33 31 pm EST    
North Bay ON     7 21 00 pm EST    
OklahomaCity OK  5 44 24 pm CST  -6
Omaha NE         5 51 46 pm CST -10
Orlando FL       7 42 06 pm EST    
Oshawa ON        7 22 37 pm EST    
Ottawa ON        7 27 09 pm EST    
Paducah KY       6 04 43 pm CST    
Paterson NJ      7 32 55 pm EST    
Pensacola FL     6 11 45 pm CST    
Peoria IL        6 03 06 pm CST    
Peterborough ON  7 23 23 pm EST    
Philadelphia PA  7 32 04 pm EST    
Pierre SD        5 47 39 pm CST  -8
Pittsburgh PA    7 22 01 pm EST    
Pittsfield MA    7 33 12 pm EST    
Port Arthur TX   5 51 49 pm CST  -8
Portland ME      7 37 07 pm EST    
Portsmouth NH    7 36 53 pm EST    
Portsmouth VA    7 33 31 pm EST    
Providence RI    7 37 06 pm EST    
Quebec City PQ   7 33 03 pm EST    
Racine WI        6 07 05 pm CST    
Raleigh NC       7 29 15 pm EST    
RapidCity SD     4 43 03 pm MST  -5
Reading PA       7 30 06 pm EST    
Regina SK        5 49 55 pm CST  -8
Richmond VA      7 29 47 pm EST    
Roanoke VA       7 24 21 pm EST    
Rochester MN     5 59 42 pm CST    
Rochester NY     7 25 08 pm EST    
Rockford IL      6 04 35 pm CST    
Saginaw MI       7 13 57 pm EST    
Saint John NB    8 41 45 pm AST    
Salina KS        5 46 42 pm CST  -7
San Antonio TX   5 39 18 pm CST  -2
Saskatoon SK     5 50 12 pm CST  -8
SaultStMarie ON  7 13 32 pm EST    
Savannah GA      7 28 49 pm EST    
Schenectady NY   7 31 43 pm EST    
Scranton PA      7 29 42 pm EST    
Sheboygan WI     7 07 27 pm EST    
Sherbrooke PQ    7 33 07 pm EST    
Sheridan WY      4 38 48 pm MST  -3
Shreveport LA    5 53 49 pm CST -10
Sioux City IA    5 52 00 pm CST -11
Sioux Falls SD   5 52 24 pm CST -11
Somerville MA    7 37 00 pm EST    
South Bend IN    7 09 37 pm EST    
Spartanburg SC   7 21 40 pm EST    
Springfield IL   6 02 45 pm CST    
Springfield MA   7 34 41 pm EST    
Springfield MO   5 54 27 pm CST -11
Springfield OH   7 14 35 pm EST    
StCatharines ON  7 22 15 pm EST    
StCloud MN       5 58 08 pm CST    
St John's NF     9 24 47 pm NST    
St Joseph MO     5 52 39 pm CST -11
St Louis MO      6 01 23 pm CST    
St Paul MN       5 59 18 pm CST    
StPetersburg FL  7 40 09 pm EST    
Stamford CT      7 34 00 pm EST    
Steubenville OH  7 20 51 pm EST    
Sudbury ON       7 18 40 pm EST    
Superior WI      6 02 04 pm CST    
Sydney NS        8 48 31 pm AST    
Syracuse NY      7 27 43 pm EST    
Tallahassee FL   7 21 35 pm EST    
Tampa FL         7 39 54 pm EST    
TerreHaute IN    7 07 17 pm EST    
Texarkana TX     5 51 35 pm CST  -9
Thunder Bay ON   7 07 08 pm EST    
Toledo OH        7 14 46 pm EST    
Topeka KS        5 50 37 pm CST -10
Toronto ON       7 21 49 pm EST    
Trenton NJ       7 32 33 pm EST    
TroiRivieres PQ  7 31 26 pm EST    
Troy NY          7 32 12 pm EST    
Tulsa OK         5 48 04 pm CST  -8
Urbana IL        6 05 43 pm CST    
Utica NY         7 29 17 pm EST    
Waco TX          5 43 27 pm CST  -4
Washington DC    7 29 18 pm EST    
Waterbury CT     7 34 25 pm EST    
Waterloo IA      5 58 54 pm CST    
Wheeling WV      7 20 45 pm EST    
White Plains NY  7 33 35 pm EST    
Whitehorse YT    3 49 07 pm PST  -1
Wichita KS       5 47 54 pm CST  -8
WichitaFalls TX  5 41 20 pm CST  -4
Wilkes Barre PA  7 29 25 pm EST    
Wilmington DE    7 31 29 pm EST    
Wilmington NC    7 33 50 pm EST    
Windsor ON       7 15 37 pm EST    
Winnipeg MB      5 58 00 pm CST    
WinstonSalem NC  7 24 42 pm EST    
Worcester MA     7 35 55 pm EST    
Yellowknife NT   5 00 33 pm MST -10
Yonkers NY       7 33 26 pm EST    
York PA          7 28 50 pm EST    
Youngstown OH    7 20 28 pm EST    
Zanesville OH    7 18 14 pm EST    
     There are several other occultations that can be taped with a 
camcorder pointed into the eyepiece of a telescope; predictions for them 
can be provided upon request.  At about 11:20 pm PST, 12:30 am MST, and 
1:30 am CST, Saturn will disappear behind the dark side of the gibbous 
Moon on Monday night, Dec 8-9; details of this naked-eye event are given 
on pages 100-101 of the December issue of Sky and Telescope, and are 
also on our Web site.  Although very interesting to see, there is no 
value in observations of that event, since the phenomena will not be 
sharp and precisely timeable, as they are for occultations of stars. 
     The Hyades disappearances that precede Aldebaran's disappearance on 
Friday evening, Dec. 12, will be easy just using autofocus since those 
events will all occur close to the terminator, providing a good 
reference for the autofocus.  See the Sky and Telescope article and 
IOTA's Web page for more information.  Sample predictions below were 
computed for Greenbelt, Maryland, about 12 miles northeast of downtown 
Washington, DC.  Predictions for other locations will be supplied upon 
request by e-mail for observers who will try to time many of these 
events. 
I.O.T.A. TOTAL OCCULTATION PREDICTIONS FOR 1997 December
for Greenbelt, Maryland, David Dunham
Longitude W 76d 52' 09.9", Latitude +38d 59' 10.1", Height +53 meters
DAY  E.S.T. P  Z.C. VIS SP  PCT  SN MN  MN CUSP  WA   A    B   Star
    H  M  S     NO. MAG    SNLT  AL AL  AZ  ANG      M/O  M/O  Name
DECEMBER
 6/19 29 29/D* 3353 3.7 M0  47+     39 210  59S 122 -2.1 -1.0 lambda Aquarii
 6/20 45 22/D  3360 6.3 K0  48+     30 230  88S  93 -1.2 -0.3 78 Aquarii
 7/20 17 26/D  3505 5.6 K0  59+     43 212  60N  61 -1.1 +1.3 20 Piscium
10/17 41 58/D   368 6.3 K0  88+ -11 34 106  30S 146 -1.8 -0.3 
12/19 55 29/D   667 5.3 G5  98+     42 104  77N  57 -0.7 +2.3 75 Tauri
12/20 04 12/D   672 6.6 F8  99+     44 106  52S 107 -1.4 +0.8 
12/21 00 03/D   677 4.8 A5  99+     54 119  35S 124 -2.1 -0.2
12/21 15 14/D   680 6.7 F2  99+     56 124  16S 144 -2.7 -2.0
12/22 59 57/D   685 6.5 F0  99+     67 172  15S 143 -2.7 -3.0
13/00 16 38/D*  692 0.8 K5  99+     64 215  37S 120 -2.1 -1.5 Aldebaran
13/01 26 26/R   692 0.8 K5  99+     54 241 -84S 241 -1.7 +0.8 Aldebaran
19/04 59 46/R  1486 4.6 K2  73-     60 198  43N 317 -1.0 -3.3 31 Leonis
20/06 18 18/R  1589 5.7 M2  64- -12 53 211  90N 269 -1.9 -1.4 56 Leonis
21/00 26 51/R  1678 5.8 F5  56-     11  95  11S 190 -0.4 +7.4 89 Leonis
22/00 57 16/R? 1772 3.9 A0  47-      6  96  46S 225 -0.3 +2.3 eta Virginis
24/02 49 32/R  1994 6.5 F8  28-      6 106  41N 320 +0.1 -1.6 
26/04 49 32/R* 2223 4.0 K0  12-      7 115  83N 283 -0.4 +0.4 gamma Librae