IOTA/IOTA-ES occultation update for (992) Swasey / TYC 0697-00545-1 event on 2012 Nov 11, 14:08 UT Visible from Russia, China Summary ------- On 2012 Nov 11 UT, the 21 km diameter asteroid (992) Swasey will occult a 9.3 mag star in the constellation Orion for observers along a path across Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.4 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.8 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: 25 * date and approx. time of event: 2012 Nov 11, 14:01 - 2012 Nov 11, 14:15 UT * geocentric midpoint of event [JD]: 2456243.0891 * magnitude of target star: 9.3 * magnitude drop [mag]: 6.4 * estimated maximum duration [s]: 1.8 * Moon: 8 % sunlit, 118° distance * Sun: 151° distance * rough path description: Russia, China The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 2.67 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .032", 91° ) * approx speed of asteroid's shadow [km/s]: 11.6340 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0697-00545-1 by 992 Swasey on 2012 Nov 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 78 0 0 15 13 50 14 15 2 0 76 -29 15 21 46 15 5 54 16 4 29 .. .. .. 79 0 0 15 29 10 14 15 2 1 76 -30 15 37 7 15 21 13 16 19 57 .. .. .. 80 0 0 15 45 10 14 15 2 2 76 -31 15 53 9 15 37 12 16 36 6 .. .. .. 81 0 0 16 1 50 14 15 1 3 77 -32 16 9 51 15 53 51 16 52 56 .. .. .. 82 0 0 16 19 11 14 15 0 4 77 -33 16 27 13 16 11 10 17 10 26 .. .. .. 83 0 0 16 37 11 14 14 59 5 77 -34 16 45 15 16 29 9 17 28 36 .. .. .. 84 0 0 16 55 51 14 14 58 6 77 -35 17 3 56 16 47 47 17 47 26 16 5 0 85 0 0 17 15 10 14 14 56 7 78 -36 17 23 16 17 7 4 18 6 55 16 24 8 86 0 0 17 35 7 14 14 55 8 78 -37 17 43 16 17 27 0 18 27 4 16 43 55 87 0 0 17 55 43 14 14 53 9 78 -38 18 3 54 17 47 34 18 47 51 17 4 21 88 0 0 18 16 58 14 14 51 10 79 -38 18 25 10 18 8 47 19 9 17 17 25 24 89 0 0 18 38 50 14 14 48 11 79 -39 18 47 4 18 30 38 19 31 22 17 47 5 90 0 0 19 1 20 14 14 45 12 79 -40 19 9 36 18 53 6 19 54 4 18 9 23 91 0 0 19 24 28 14 14 43 13 80 -41 19 32 45 19 16 11 20 17 24 18 32 18 92 0 0 19 48 12 14 14 40 14 80 -42 19 56 31 19 39 53 20 41 21 18 55 50 93 0 0 20 12 32 14 14 36 15 81 -43 20 20 54 20 4 11 21 5 55 19 19 57 94 0 0 20 37 28 14 14 33 16 81 -44 20 45 52 20 29 6 21 31 5 19 44 41 95 0 0 21 3 0 14 14 29 17 81 -45 21 11 27 20 54 35 21 56 51 20 9 59 96 0 0 21 29 7 14 14 25 18 82 -46 21 37 36 21 20 40 22 23 12 20 35 52 97 0 0 21 55 49 14 14 21 19 82 -47 22 4 19 21 47 19 22 50 9 21 2 20 98 0 0 22 23 4 14 14 16 20 83 -48 22 31 37 22 14 32 23 17 39 21 29 21 99 0 0 22 50 53 14 14 12 21 83 -49 22 59 28 22 42 19 23 45 43 21 56 55 100 0 0 23 19 14 14 14 7 22 84 -50 23 27 52 23 10 38 24 14 20 22 25 2 101 0 0 23 48 8 14 14 2 23 84 -51 23 56 49 23 39 29 24 43 30 22 53 40 102 0 0 24 17 34 14 13 57 24 85 -52 24 26 16 24 8 52 25 13 12 23 22 50 103 0 0 24 47 30 14 13 51 25 85 -53 24 56 15 24 38 46 25 43 25 23 52 31 104 0 0 25 17 56 14 13 46 26 86 -53 25 26 44 25 9 10 26 14 8 24 22 42 105 0 0 25 48 52 14 13 40 26 87 -54 25 57 43 25 40 3 26 45 21 24 53 21 106 0 0 26 20 17 14 13 34 27 87 -55 26 29 10 26 11 25 27 17 2 25 24 30 107 0 0 26 52 9 14 13 28 28 88 -56 27 1 5 26 43 15 27 49 12 25 56 6 108 0 0 27 24 29 14 13 21 29 89 -57 27 33 28 27 15 32 28 21 49 26 28 9 109 0 0 27 57 15 14 13 15 30 90 -57 28 6 16 27 48 15 28 54 53 27 0 38 110 0 0 28 30 26 14 13 8 31 90 -58 28 39 30 28 21 23 29 28 22 27 33 32 111 0 0 29 4 1 14 13 1 32 91 -59 29 13 8 28 54 56 30 2 15 28 6 50 112 0 0 29 38 0 14 12 54 32 92 -59 29 47 9 29 28 52 30 36 32 28 40 31 113 0 0 30 12 21 14 12 47 33 93 -60 30 21 33 30 3 10 31 11 11 29 14 35 114 0 0 30 47 3 14 12 40 34 94 -61 30 56 18 30 37 50 31 46 12 29 49 0 115 0 0 31 22 6 14 12 32 35 95 -61 31 31 24 31 12 49 32 21 33 30 23 46 116 0 0 31 57 28 14 12 25 36 96 -62 32 6 49 31 48 8 32 57 13 30 58 50 117 0 0 32 33 8 14 12 17 36 97 -62 32 42 31 32 23 46 33 33 12 31 34 13 118 0 0 33 9 4 14 12 9 37 98 -63 33 18 31 32 59 39 34 9 27 32 9 52 119 0 0 33 45 17 14 12 1 38 99 -63 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12 35 71 56 47 72 55 6 71 14 57 - 99 0 0 72 0 5 14 2 0 14 271 -9 72 8 1 71 52 11 72 50 39 71 10 14 - 98 0 0 71 55 15 14 1 59 14 272 -9 72 3 12 71 47 20 72 45 58 71 5 16 - 97 0 0 71 50 11 14 1 58 14 273 -9 71 58 9 71 42 13 72 41 3 71 0 2 - 96 0 0 71 44 51 14 1 57 13 274 -8 71 52 51 71 36 52 72 35 52 70 54 33 - 95 0 0 71 39 16 14 1 56 13 274 -8 71 47 17 71 31 15 72 30 27 70 48 48 - 94 0 0 71 33 25 14 1 55 13 275 -8 71 41 28 71 25 23 72 24 47 70 42 47 - 93 0 0 71 27 19 14 1 54 12 276 -7 71 35 23 71 19 15 72 18 51 70 36 31 - 92 0 0 71 20 56 14 1 53 12 277 -7 71 29 2 71 12 51 72 12 40 70 29 57 - 91 0 0 71 14 17 14 1 52 12 278 -7 71 22 25 71 6 10 72 6 13 70 23 7 - 90 0 0 71 7 21 14 1 51 11 279 -6 71 15 32 70 59 12 71 59 29 70 16 0 - 89 0 0 71 0 9 14 1 50 11 280 -6 71 8 21 70 51 58 71 52 29 70 8 35 - 88 0 0 70 52 39 14 1 49 11 281 -6 71 0 53 70 44 26 71 45 12 70 0 53 - 87 0 0 70 44 52 14 1 48 10 282 -5 70 53 8 70 36 37 71 37 38 69 52 53 - 86 0 0 70 36 46 14 1 48 10 283 -5 70 45 4 70 28 29 71 29 46 69 44 35 - 85 0 0 70 28 23 14 1 47 10 284 -5 70 36 43 70 20 3 71 21 37 69 35 58 - 84 0 0 70 19 40 14 1 46 9 285 -4 70 28 3 70 11 19 71 13 9 69 27 2 - 83 0 0 70 10 39 14 1 45 9 286 -4 70 19 4 70 2 15 71 4 23 69 17 46 - 82 0 0 70 1 19 14 1 45 9 287 -4 70 9 46 69 52 53 70 55 17 69 8 11 - 81 0 0 69 51 38 14 1 44 8 288 -3 70 0 8 69 43 10 70 45 53 68 58 16 - 80 0 0 69 41 38 14 1 43 8 289 -3 69 50 10 69 33 7 70 36 8 68 48 1 - 79 0 0 69 31 17 14 1 42 7 290 -3 69 39 52 69 22 44 70 26 3 68 37 24 - 78 0 0 69 20 35 14 1 42 7 291 -2 69 29 12 69 11 59 70 15 38 68 26 26 - 77 0 0 69 9 31 14 1 41 7 292 -2 69 18 11 69 0 53 70 4 51 68 15 7 - 76 0 0 68 58 6 14 1 41 6 292 -1 69 6 49 68 49 25 69 53 43 68 3 25 - 75 0 0 68 46 18 14 1 40 6 293 -1 68 55 4 68 37 35 69 42 13 67 51 21 - 74 0 0 68 34 8 14 1 39 5 294 -1 68 42 56 68 25 21 69 30 21 67 38 53 - 73 0 0 68 21 34 14 1 39 5 295 0 68 30 25 68 12 45 69 18 5 67 26 2 Uncertainty in time = +/- 6 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 0697-00545-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 05 26.7988 DE: +13 48 10.478 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .025 ) * V mag [mag]: 9.3 * B mag [mag]: 9.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (992) Swasey approx. diameter [km]: 21 approx. diameter ["]: .013 distance from Earth [AU]: 2.27000 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1142 number of rejected observations: 39 time covered by the observations: 1922 Nov 21 - 2012 Oct 09 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.020, 92° remarks: * orbital elements for (992) Swasey : Mean anomaly = 241.24546803 deg Arg. of pericenter = 343.39634573 deg Long. of node = 212.39837305 deg Inclination = 10.85511096 deg Eccentricity = 0.08603479 Semimajor axis = 3.03357528 AU Perihelion dist = 2.77258228 AU Mag: H = 10.47, G = 0.15 Epoch of elements : MJD 56242.58900000 TDT (2012 Nov 11.589) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 11 992 Swasey 14h 8.3m UT 9.3 5 5 26.799 13 48 10.48TYC 0697-00545-1 9.8 15.7 21 1.8 2.270 -1.558 -11.53 173.1624 13.807 -36.05 -17.63 14.1384 -0.30627 0.60212 -5.85347 -2.97603 -0.00282 0.00057 2000 240.762516201211 9.00000343.396346212.398373 10.8551110.08603479 3.0335753 2.772582310.8 5.00.15 RATE 1.8654000 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.032 91 3.67 0.034 0 0-2-2 056226.0020121111_0545-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org