IOTA/IOTA-ES occultation update for (43) Ariadne / TYC 1861-01347-1 event on 2012 Dec 19, 00:22 UT Visible from Arabia, N Africa, Caribbean Summary ------- On 2012 Dec 19 UT, the 66 km diameter asteroid (43) Ariadne will occult a 12.4 mag star in the constellation Taurus for observers along a path across Arabia, N Africa, Caribbean. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 11.1 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: 91 * date and approx. time of event: 2012 Dec 19, 00:14 - 2012 Dec 19, 00:30 UT * geocentric midpoint of event [JD]: 2456280.5154875 * magnitude of target star: 12.4 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 5.0 * Moon: 38 % sunlit, 101° distance * Sun: 177° distance * rough path description: Arabia, N Africa, Caribbean The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .029", 90° ) * approx speed of asteroid's shadow [km/s]: 13.2317 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1861-01347-1 by 43 Ariadne on 2012 Dec 19 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 - 99 0 0 3 15 28 0 30 14 3 67 -1 3 35 13 2 55 44 3 54 59 2 36 2 - 98 0 0 3 41 53 0 30 13 4 67 -2 4 1 39 3 22 8 4 21 25 3 2 25 - 97 0 0 4 8 24 0 30 12 5 67 -3 4 28 10 3 48 38 4 47 58 3 28 54 - 96 0 0 4 35 0 0 30 11 7 67 -4 4 54 47 4 15 13 5 14 35 3 55 28 - 95 0 0 5 1 40 0 30 10 8 67 -5 5 21 28 4 41 53 5 41 17 4 22 8 - 94 0 0 5 28 25 0 30 9 9 67 -6 5 48 13 5 8 37 6 8 3 4 48 51 - 93 0 0 5 55 13 0 30 7 10 67 -7 6 15 2 5 35 25 6 34 52 5 15 38 - 92 0 0 6 22 3 0 30 6 11 67 -8 6 41 53 6 2 15 7 1 43 5 42 28 - 91 0 0 6 48 56 0 30 4 12 68 -9 7 8 45 6 29 7 7 28 36 6 9 19 - 90 0 0 7 15 49 0 30 2 13 68 -10 7 35 39 6 56 0 7 55 30 6 36 12 - 89 0 0 7 42 44 0 30 0 14 68 -11 8 2 34 7 22 54 8 22 25 7 3 6 - 88 0 0 8 9 38 0 29 57 15 68 -13 8 29 28 7 49 48 8 49 20 7 30 0 - 87 0 0 8 36 31 0 29 55 16 68 -14 8 56 21 8 16 42 9 16 13 7 56 53 - 86 0 0 9 3 23 0 29 52 17 68 -15 9 23 13 8 43 33 9 43 5 8 23 45 - 85 0 0 9 30 13 0 29 49 18 69 -16 9 50 3 9 10 23 10 9 55 8 50 35 - 84 0 0 9 57 0 0 29 46 20 69 -17 10 16 50 9 37 10 10 36 41 9 17 22 - 83 0 0 10 23 43 0 29 43 21 69 -18 10 43 33 10 3 54 11 3 24 9 44 6 - 82 0 0 10 50 22 0 29 40 22 69 -19 11 10 12 10 30 34 11 30 3 10 10 46 - 81 0 0 11 16 57 0 29 36 23 69 -20 11 36 47 10 57 9 11 56 37 10 37 21 - 80 0 0 11 43 26 0 29 33 24 70 -21 12 3 16 11 23 38 12 23 6 11 3 51 - 79 0 0 12 9 50 0 29 29 25 70 -22 12 29 39 11 50 2 12 49 28 11 30 16 - 78 0 0 12 36 7 0 29 25 26 70 -23 12 55 55 12 16 20 13 15 44 11 56 33 - 77 0 0 13 2 16 0 29 21 27 70 -24 13 22 4 12 42 30 13 41 53 12 22 44 - 76 0 0 13 28 18 0 29 17 28 71 -25 13 48 5 13 8 32 14 7 53 12 48 47 - 75 0 0 13 54 12 0 29 13 29 71 -26 14 13 58 13 34 26 14 33 45 13 14 42 - 74 0 0 14 19 56 0 29 9 30 71 -27 14 39 42 14 0 12 14 59 28 13 40 28 - 73 0 0 14 45 31 0 29 4 31 71 -28 15 5 16 14 25 48 15 25 2 14 6 5 - 72 0 0 15 10 57 0 28 59 32 72 -29 15 30 40 14 51 14 15 50 25 14 31 32 - 71 0 0 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294 -5 15 41 12 15 1 40 16 1 0 14 41 56 88 0 0 14 55 36 0 14 22 1 294 -4 15 15 24 14 35 50 15 35 12 14 16 4 89 0 0 14 29 36 0 14 22 0 294 -3 14 49 24 .. .. .. 15 9 14 .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: TYC 1861-01347-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 35.0332 DE: +23 15 11.097 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .028 ) * V mag [mag]: 12.4 * B mag [mag]: 12.4 * 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]: 1.57200 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1278 number of rejected observations: 158 time covered by the observations: 1904 Nov 17 - 2012 Dec 13 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 91° remarks: * orbital elements for (43) Ariadne : Mean anomaly = 158.73208833 deg Arg. of pericenter = 16.24297088 deg Long. of node = 264.87180313 deg Inclination = 3.46989476 deg Eccentricity = 0.16780819 Semimajor axis = 2.20438805 AU Perihelion dist = 1.83447368 AU Mag: H = 7.80, G = 0.11 Epoch of elements : MJD 56280.01600000 TDT (2012 Dec 19.016) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 19 43 Ariadne 0h 22.3m UT 12.4 5 36 35.033 23 15 11.10TYC 1861-01347-1 12.4 11.1 66 5.0 1.572 -3.009 -4.94 -9.4429 23.255 173.70 -23.41 0.3717 -0.01825 0.15322 -7.41596 -0.88321 0.00031 0.00002 2000 155.715845201212 9.00000 16.242971264.871803 3.4698950.16780819 2.2043881 1.8344737 7.9 5.00.11 RATE 3.0114250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.029 90 1.50 0.029 0 0 2-3 056278.0020121219_1347-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 18:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org