IOTA/IOTA-ES occultation update for (392) Wilhelmina / TYC 0156-01293-1 event on 2012 Nov 24, 09:15 UT Visible from Caribbean, Central America Summary ------- On 2012 Nov 24 UT, the 59 km diameter asteroid (392) Wilhelmina will occult a 12.4 mag star in the constellation Monoceros for observers along a path across Caribbean, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 14.0 mag (the magnitude of the asteroid) for at most 6.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 57 * date and approx. time of event: 2012 Nov 24, 09:05 - 2012 Nov 24, 09:28 UT * geocentric midpoint of event [JD]: 2456255.88612083 * magnitude of target star: 12.4 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 6.8 * Moon: 85 % sunlit, 87° distance * Sun: 137° distance * rough path description: Caribbean, Central America The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 1.10 * 1 sigma uncertainty interval [seconds]: +/- 7.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .036", 91° ) * approx speed of asteroid's shadow [km/s]: 8.7287 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0156-01293-1 by 392 Wilhelmina on 2012 Nov 24 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude 176 43 7 -54 0 0 9 28 0 2 79 -9 174 8 15 178 56 18 ... .. .. -176 55 45 -176 18 46 -53 0 0 9 27 56 6 73 -12 -177 59 56 -174 44 14 177 43 56 -171 34 6 Latitude Latitude Latitude Latitude -176 0 0 -52 56 45 9 27 55 6 73 -12 -52 39 56 -53 13 34 -52 2 59 -53 50 39 -175 0 0 -52 46 0 9 27 54 7 72 -12 -52 29 8 -53 2 53 -51 52 3 -53 40 6 -174 0 0 -52 34 45 9 27 53 8 71 -13 -52 17 48 -52 51 42 -51 40 36 -53 29 3 -173 0 0 -52 22 58 9 27 52 8 70 -13 -52 5 58 -52 39 59 -51 28 36 -53 17 28 -172 0 0 -52 10 39 9 27 51 9 70 -14 -51 53 35 -52 27 44 -51 16 4 -53 5 23 -171 0 0 -51 57 48 9 27 50 10 69 -14 -51 40 40 -52 14 57 -51 3 0 -52 52 46 -170 0 0 -51 44 24 9 27 48 10 68 -15 -51 27 11 -52 1 38 -50 49 22 -52 39 36 -169 0 0 -51 30 27 9 27 47 11 67 -15 -51 13 10 -51 47 46 -50 35 11 -52 25 54 -168 0 0 -51 15 57 9 27 45 12 66 -15 -50 58 35 -51 33 20 -50 20 25 -52 11 38 -167 0 0 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23 35 43 - 58 0 0 25 6 12 9 7 51 46 250 -15 25 24 41 24 47 41 26 5 18 24 6 55 - 57 0 0 25 36 17 9 7 42 45 250 -15 25 54 40 25 17 52 26 35 5 24 37 19 - 56 0 0 26 5 34 9 7 33 44 250 -14 26 23 52 25 47 16 27 4 4 25 6 55 - 55 0 0 26 34 5 9 7 24 43 251 -13 26 52 17 26 15 52 27 32 17 25 35 43 - 54 0 0 27 1 48 9 7 15 42 251 -12 27 19 55 26 43 41 27 59 42 26 3 45 - 53 0 0 27 28 45 9 7 7 41 251 -12 27 46 46 27 10 43 28 26 22 26 30 59 - 52 0 0 27 54 56 9 6 59 40 252 -11 28 12 52 27 36 59 28 52 16 26 57 27 - 51 0 0 28 20 21 9 6 51 40 252 -10 28 38 12 28 2 29 29 17 24 27 23 9 - 50 0 0 28 45 0 9 6 43 39 252 -10 29 2 46 28 27 14 29 41 47 27 48 4 - 49 0 0 29 8 55 9 6 36 38 253 -9 29 26 35 28 51 13 30 5 25 28 12 15 - 48 0 0 29 32 4 9 6 29 37 253 -8 29 49 40 29 14 28 30 28 20 28 35 40 - 47 0 0 29 54 30 9 6 21 36 253 -8 30 12 1 29 36 58 30 50 30 28 58 21 - 46 0 0 30 16 11 9 6 15 35 254 -7 30 33 38 29 58 44 31 11 57 29 20 17 - 45 0 0 30 37 9 9 6 8 34 254 -6 30 54 31 30 19 47 31 32 40 29 41 30 - 44 0 0 30 57 25 9 6 2 33 255 -6 31 14 42 30 40 6 31 52 41 30 1 59 - 43 0 0 31 16 57 9 5 55 32 255 -5 31 34 10 30 59 43 32 12 0 30 21 45 - 42 0 0 31 35 47 9 5 49 31 256 -4 31 52 56 31 18 37 32 30 37 30 40 49 - 41 0 0 31 53 55 9 5 43 30 256 -4 32 11 0 31 36 50 32 48 33 30 59 10 - 40 0 0 32 11 22 9 5 38 30 257 -3 32 28 23 31 54 20 33 5 47 31 16 49 - 39 0 0 32 28 8 9 5 32 29 257 -2 32 45 5 32 11 10 33 22 21 31 33 46 - 38 0 0 32 44 13 9 5 27 28 257 -2 33 1 6 32 27 18 33 38 14 31 50 3 - 37 0 0 32 59 37 9 5 22 27 258 -1 33 16 27 32 42 46 33 53 27 32 5 38 - 36 0 0 33 14 21 9 5 17 26 258 0 33 31 8 32 57 34 34 8 1 32 20 34 Uncertainty in time = +/- 9 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0156-01293-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 47 36.1111 DE: +05 10 44.635 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .052, .033 ) * V mag [mag]: 12.4 * B mag [mag]: 12.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (392) Wilhelmina approx. diameter [km]: 59 approx. diameter ["]: .044 distance from Earth [AU]: 1.85900 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1014 number of rejected observations: 60 time covered by the observations: 1933 Oct 23 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.013, 97° remarks: * orbital elements for (392) Wilhelmina : Mean anomaly = 50.53711291 deg Arg. of pericenter = 174.73422656 deg Long. of node = 209.86728423 deg Inclination = 14.32379588 deg Eccentricity = 0.14167718 Semimajor axis = 2.88486839 AU Perihelion dist = 2.47614838 AU Mag: H = 9.71, G = 0.15 Epoch of elements : MJD 56255.38600000 TDT (2012 Nov 24.386) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 24 392 Wilhelmina 9h 16.0m UT 12.4 6 47 36.111 5 10 44.64TYC 0156-01293-1 12.4 14.0 59 6.8 1.859 -1.105 -16.48 -100.8388 5.183 37.70 -20.66 9.2669 0.11604 -0.11605 -3.48286 -3.48455 -0.00362 0.00168 2000 49.45373120121119.00000174.734227209.867284 14.3237960.14167718 2.8848684 2.4761484 9.7 5.00.15 RATE 2.0114770 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.036 91 2.10 0.048 0 0 1-5 056247.0020121124_1293-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org