IOTA/IOTA-ES occultation update for (43) Ariadne / 2UCAC 39982638 event on 2012 Dec 11, 12:47 UT Visible from W USA, SW Canada, E Russia, China Summary ------- On 2012 Dec 11 UT, the 66 km diameter asteroid (43) Ariadne will occult a 12.3 mag star in the constellation Taurus for observers along a path across W USA, SW Canada, E Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 11.2 mag (the magnitude of the asteroid) for at most 5.0 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: 92 * date and approx. time of event: 2012 Dec 11, 12:40 - 2012 Dec 11, 12:54 UT * geocentric midpoint of event [JD]: 2456273.0329625 * magnitude of target star: 12.3 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 5.0 * Moon: 5 % sunlit, 147° distance * Sun: 173° distance * rough path description: W USA, SW Canada, E Russia, China The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .027", 0° ) * approx speed of asteroid's shadow [km/s]: 13.1086 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 39982638 by 43 Ariadne on 2012 Dec 11 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 ' " Latitude Latitude Latitude Latitude 73 0 0 22 48 53 12 54 27 1 65 -7 23 11 47 22 26 4 23 34 20 22 3 48 74 0 0 23 15 45 12 54 27 2 65 -8 23 38 42 22 52 54 24 1 17 22 30 36 75 0 0 23 42 45 12 54 27 3 66 -9 24 5 44 23 19 52 24 28 21 22 57 32 76 0 0 24 9 53 12 54 26 4 66 -10 24 32 54 23 46 58 24 55 33 23 24 36 77 0 0 24 37 7 12 54 25 5 66 -11 25 0 10 24 14 10 25 22 51 23 51 46 78 0 0 25 4 27 12 54 24 6 67 -12 25 27 32 24 41 28 25 50 15 24 19 2 79 0 0 25 31 52 12 54 23 7 67 -13 25 54 59 25 8 51 26 17 44 24 46 24 80 0 0 25 59 21 12 54 22 8 68 -14 26 22 30 25 36 19 26 45 16 25 13 50 81 0 0 26 26 54 12 54 20 9 68 -15 26 50 4 26 3 50 27 12 52 25 41 19 82 0 0 26 54 29 12 54 19 10 69 -16 27 17 41 26 31 24 27 40 31 26 8 51 83 0 0 27 22 6 12 54 17 11 69 -17 27 45 19 26 58 59 28 8 11 26 36 26 84 0 0 27 49 45 12 54 15 12 70 -18 28 12 59 27 26 36 28 35 52 27 4 1 85 0 0 28 17 23 12 54 13 13 70 -19 28 40 39 27 54 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57 51 -106 0 0 44 22 41 12 41 19 24 280 -19 44 45 27 44 0 1 45 7 52 43 37 54 -105 0 0 44 2 30 12 41 16 23 281 -18 44 25 18 43 39 47 44 47 45 43 17 37 -104 0 0 43 41 59 12 41 13 23 281 -17 44 4 49 43 19 14 44 27 19 42 57 1 -103 0 0 43 21 8 12 41 10 22 282 -16 43 44 1 42 58 21 44 6 33 42 36 6 -102 0 0 42 59 58 12 41 7 21 283 -15 43 22 54 42 37 8 43 45 28 42 14 52 -101 0 0 42 38 29 12 41 4 20 284 -15 43 1 27 42 15 37 43 24 3 41 53 18 -100 0 0 42 16 41 12 41 2 20 284 -14 42 39 41 41 53 47 43 2 20 41 31 26 - 99 0 0 41 54 35 12 40 59 19 285 -13 42 17 37 41 31 38 42 40 17 41 9 15 - 98 0 0 41 32 10 12 40 56 18 286 -12 41 55 14 41 9 11 42 17 56 40 46 46 - 97 0 0 41 9 26 12 40 54 17 287 -11 41 32 33 40 46 26 41 55 17 40 23 59 - 96 0 0 40 46 25 12 40 51 16 287 -11 41 9 34 40 23 23 41 32 20 40 0 54 - 95 0 0 40 23 7 12 40 49 15 288 -10 40 46 17 40 0 3 41 9 5 39 37 32 - 94 0 0 39 59 31 12 40 47 15 289 -9 40 22 42 39 36 25 40 45 32 39 13 53 - 93 0 0 39 35 38 12 40 45 14 289 -8 39 58 51 39 12 30 40 21 43 38 49 56 - 92 0 0 39 11 28 12 40 43 13 290 -7 39 34 43 38 48 19 39 57 36 38 25 44 - 91 0 0 38 47 2 12 40 41 12 291 -6 39 10 19 38 23 52 39 33 14 38 1 15 - 90 0 0 38 22 21 12 40 39 11 291 -5 38 45 39 37 59 9 39 8 35 37 36 31 - 89 0 0 37 57 24 12 40 38 10 292 -5 38 20 43 37 34 11 38 43 41 37 11 32 - 88 0 0 37 32 12 12 40 36 9 292 -4 37 55 33 37 8 58 38 18 31 36 46 17 - 87 0 0 37 6 46 12 40 35 9 293 -3 37 30 7 36 43 31 37 53 7 36 20 49 - 86 0 0 36 41 6 12 40 33 8 294 -2 37 4 28 36 17 49 37 27 29 35 55 7 - 85 0 0 36 15 12 12 40 32 7 294 -1 36 38 35 35 51 55 37 1 37 35 29 11 - 84 0 0 35 49 5 12 40 31 6 295 0 36 12 29 35 25 47 36 35 32 35 3 3 Uncertainty in time = +/- 2 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: 2UCAC 39982638 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 45 37.3257 DE: +23 28 59.692 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .023, .027 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (43) Ariadne approx. diameter [km]: 66 approx. diameter ["]: .058 distance from Earth [AU]: 1.57100 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1274 number of rejected observations: 158 time covered by the observations: 1904 Nov 17 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 92° remarks: * orbital elements for (43) Ariadne : Mean anomaly = 156.48403507 deg Arg. of pericenter = 16.23977026 deg Long. of node = 264.87180548 deg Inclination = 3.46981537 deg Eccentricity = 0.16778365 Semimajor axis = 2.20442438 AU Perihelion dist = 1.83455802 AU Mag: H = 7.80, G = 0.11 Epoch of elements : MJD 56272.53300000 TDT (2012 Dec 11.533) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 11 43 Ariadne 12h 47.5m UT 12.3 5 45 37.326 23 28 59.692UCAC 39982638 0.0 11.2 66 5.0 1.571 -2.994 -4.28 173.9016 23.485 -13.50 -23.05 12.7911 -0.05266 0.50226 -7.35925 -0.76469 -0.00073 -0.00003 2000 155.721260201212 9.00000 16.239770264.871805 3.4698150.16778365 2.2044244 1.8345580 7.9 5.00.11 RATE 3.0113500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.027 0 1.49 0.028 0 0-3 2 056264.0020121211_982638 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org