IOTA/IOTA-ES occultation update for (2165) Young / TYC 0025-00251-1 event on 2012 Oct 05, 02:47 UT Visible from Canada, W USA Summary ------- On 2012 Oct 05 UT, the 31 km diameter asteroid (2165) Young will occult a 11.4 mag star in the constellation Pisces for observers along a path across Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 19 * date and approx. time of event: 2012 Oct 05, 02:42 - 2012 Oct 05, 02:53 UT * geocentric midpoint of event [JD]: 2456205.61660833 * magnitude of target star: 11.4 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 3.1 * Moon: 79 % sunlit, 49° distance * Sun: 174° distance * rough path description: Canada, W USA The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 3.55 * 1 sigma uncertainty interval [seconds]: +/- 10.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .093) * 1 sigma uncertainty ellipse (major, minor, PA): ( .093", .086", 356° ) * approx speed of asteroid's shadow [km/s]: 9.9070 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0025-00251-1 by 2165 Young on 2012 Oct 5 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 51 28 58 80 47 33 2 42 38 7 270 -4 45 51 9 80 41 12 58 1 11 80 47 40 21 13 27 78 46 42 ... .. .. .. .. .. 35 7 38 81 6 11 2 42 46 10 254 -7 31 1 36 80 49 31 39 49 17 81 20 38 12 42 39 78 26 23 ... .. .. .. .. .. 21 58 25 80 58 2 2 42 54 12 241 -9 18 59 19 80 36 40 25 22 56 81 18 40 5 26 9 77 59 56 71 15 37 82 9 29 11 13 42 80 35 27 2 43 3 13 231 -10 9 5 10 80 11 56 13 39 44 80 58 55 - 0 50 59 77 29 33 46 33 21 83 15 44 2 22 41 80 4 32 2 43 11 15 222 -12 0 51 43 79 40 13 4 5 16 80 29 7 - 6 20 14 76 56 36 26 48 56 83 21 21 - 4 59 34 79 28 45 2 43 19 16 214 -13 - 6 2 54 79 4 22 - 3 48 41 79 53 33 - 11 10 32 76 22 2 11 17 9 82 59 6 - 11 12 49 78 50 11 2 43 28 17 208 -14 - 11 55 51 78 26 7 - 10 25 0 79 14 43 - 15 28 55 75 46 27 - 0 40 49 82 22 45 - 16 32 19 78 10 6 2 43 36 18 203 -15 - 17 0 21 77 46 32 - 16 1 20 78 34 6 - 19 20 56 75 10 16 - 9 57 34 81 39 29 - 21 9 36 77 29 16 2 43 44 19 198 -16 - 21 26 27 77 6 19 - 20 51 1 77 52 38 - 22 50 59 74 33 48 - 17 18 30 80 53 4 - 25 13 22 76 48 11 2 43 53 20 194 -17 - 25 21 47 76 25 53 - 25 4 3 77 10 52 - 26 2 35 73 57 14 - 23 16 37 80 5 26 - 28 50 14 76 7 9 2 44 1 21 190 -18 - 28 52 13 75 45 30 - 28 47 52 76 29 9 - 28 58 34 73 20 43 - 28 14 41 79 17 39 - 32 5 13 75 26 22 2 44 9 22 187 -19 - 32 2 15 75 5 21 - 32 8 10 75 47 42 - 31 41 15 72 44 21 - 32 28 18 78 30 16 - 35 2 12 74 45 57 2 44 18 22 183 -20 - 34 55 24 74 25 33 - 35 9 14 75 6 39 - 34 12 29 72 8 11 - 36 8 15 77 43 32 - 37 44 14 74 5 58 2 44 26 23 181 -21 - 37 34 25 73 46 9 - 37 54 26 74 26 3 - 36 33 50 71 32 18 - 39 22 12 76 57 36 - 40 13 42 73 26 28 2 44 34 24 178 -21 - 40 1 30 73 7 12 - 40 26 24 73 45 59 - 38 46 35 70 56 41 - 42 15 37 76 12 32 - 42 32 32 72 47 29 2 44 43 24 175 -22 - 42 18 26 72 28 44 - 42 47 11 73 6 27 - 40 51 48 70 21 24 - 44 52 36 75 28 20 - 44 42 16 72 9 0 2 44 51 25 173 -23 - 44 26 40 71 50 45 - 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96 22 15 47 43 58 -103 20 36 50 3 4 -100 47 3 48 24 55 2 51 7 24 108 -26 -100 21 14 48 16 27 -101 13 22 48 33 22 - 97 30 25 47 15 45 -104 35 51 49 32 21 -101 59 37 47 55 28 2 51 15 24 107 -26 -101 33 19 47 47 9 -102 26 24 48 3 45 - 98 39 38 46 47 27 -105 53 5 49 1 29 -103 13 47 47 25 52 2 51 24 23 105 -25 -102 46 58 47 17 42 -103 41 8 47 33 59 - 99 50 5 46 19 2 -107 12 36 48 30 24 -104 29 48 46 56 5 2 51 32 23 104 -25 -104 2 22 46 48 6 -104 57 46 47 4 2 -101 1 53 45 50 30 -108 34 47 47 59 3 -105 47 55 46 26 6 2 51 40 22 103 -24 -105 19 48 46 18 17 -106 16 37 46 33 52 -102 15 15 45 21 49 -110 0 3 47 27 22 -107 8 27 45 55 51 2 51 49 21 102 -23 -106 39 34 45 48 14 -107 37 59 46 3 25 -103 30 22 44 52 56 -111 29 1 46 55 18 -108 31 49 45 25 18 2 51 57 20 101 -22 -108 2 0 45 17 53 -109 2 19 45 32 40 -104 47 30 44 23 51 -113 2 22 46 22 43 -109 58 29 44 54 23 2 52 6 19 99 -22 -109 27 35 44 47 11 -110 30 8 45 1 30 -106 6 57 43 54 31 -114 41 5 45 49 32 -111 29 3 44 23 1 2 52 14 18 98 -21 -110 56 53 44 16 4 -112 2 4 44 29 52 -107 29 2 43 24 52 -116 26 32 45 15 31 -113 4 20 43 51 4 2 52 22 17 97 -20 -112 30 36 43 44 25 -113 39 2 43 57 38 -108 54 13 42 54 52 -118 20 41 44 40 28 -114 45 24 43 18 26 2 52 31 16 95 -19 -114 9 45 43 12 6 -115 22 12 43 24 39 -110 23 3 42 24 26 -120 26 38 44 3 57 -116 33 47 42 44 55 2 52 39 15 94 -18 -115 55 40 42 38 58 -117 13 17 42 50 42 -111 56 14 41 53 28 -122 49 47 43 25 16 -118 31 45 42 10 11 2 52 47 14 93 -16 -117 50 21 42 4 45 -119 14 54 42 15 26 -113 34 42 41 21 51 -125 41 18 42 43 1 -120 42 56 41 33 48 2 52 56 12 91 -15 -119 56 54 41 29 2 -121 31 25 41 38 17 -115 19 46 40 49 25 -129 34 22 41 52 57 -123 14 2 40 54 54 2 53 4 10 89 -13 -122 20 45 40 51 8 -124 11 12 40 58 12 -117 13 17 40 15 55 ... .. .. .. .. .. -126 20 1 40 11 35 2 53 12 8 87 -11 -125 13 10 40 9 37 -127 35 10 40 12 30 -119 18 10 39 41 0 ... .. .. .. .. .. -130 57 10 39 16 40 2 53 21 4 84 -7 -129 7 36 39 20 13 -133 52 22 39 4 50 -121 39 27 39 3 59 ... .. .. .. .. .. Uncertainty in time = +/- 11 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0025-00251-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 07 23.8721 DE: +07 03 47.778 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .057, .085 ) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2165) Young approx. diameter [km]: 31 approx. diameter ["]: .026 distance from Earth [AU]: 1.63500 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1111 number of rejected observations: 36 time covered by the observations: 1929 Oct 27 - 2012 Sep 15 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.039, 67° remarks: * orbital elements for (2165) Young : Mean anomaly = 340.01827142 deg Arg. of pericenter = 25.06010368 deg Long. of node = 19.33558820 deg Inclination = 0.94371552 deg Eccentricity = 0.17401695 Semimajor axis = 3.12834505 AU Perihelion dist = 2.58395998 AU Mag: H = 11.28, G = 0.15 Epoch of elements : MJD 56205.11600000 TDT (2012 Oct 05.116) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 5 2165 Young 2h 47.9m UT 11.4 1 7 23.872 7 3 47.78TYC 0025-00251-1 12.2 14.7 31 3.1 1.635 -1.893 -10.55 -39.3188 7.067 135.12 -4.85 2.7986 -0.30121 0.80299 -5.23679 -1.96064 -0.00059 -0.00023 2000 339.1069682012 930.00000 25.060104 19.335588 0.9437160.17401695 3.1283451 2.583960011.3 5.00.15 RATE 1.7812800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.093 0.086 356 4.55 0.093 0 0 1-2 056197.0020121005_0251-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org