IOTA/IOTA-ES occultation update for (1508) Kemi / TYC 1796-00902-1 event on 2012 Sep 12, 07:10 UT Visible from E Canada, NE USA, Caribbean, Colombia, Peru Summary ------- On 2012 Sep 12 UT, the 18 km diameter asteroid (1508) Kemi will occult a 10.1 mag star in the constellation Aries for observers along a path across E Canada, NE USA, Caribbean, Colombia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.1 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: 23 * date and approx. time of event: 2012 Sep 12, 07:04 - 2012 Sep 12, 07:15 UT * geocentric midpoint of event [JD]: 2456182.79870833 * magnitude of target star: 10.1 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.1 * Moon: 16 % sunlit, 69° distance * Sun: 114° distance * rough path description: E Canada, NE USA, Caribbean, Colombia, Peru The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 2.91 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .035", 53° ) * approx speed of asteroid's shadow [km/s]: 16.3621 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1796-00902-1 by 1508 Kemi on 2012 Sep 12 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 - 94 2 17 -35 36 1 7 4 10 11 40 -56 - 94 13 25 -35 39 47 - 93 51 18 -35 32 20 - 95 20 57 -36 3 43 - 92 49 34 -35 12 33 - 90 33 15 -31 10 4 7 4 20 17 38 -59 - 90 41 47 -31 12 4 - 90 24 47 -31 8 7 - 91 32 23 -31 24 24 - 89 36 17 -30 57 23 - 88 15 44 -27 42 6 7 4 29 21 37 -60 - 88 23 14 -27 43 24 - 88 8 17 -27 40 49 - 89 7 23 -27 51 26 - 87 25 21 -27 33 46 - 86 31 44 -24 43 9 7 4 38 24 36 -61 - 86 38 38 -24 44 4 - 86 24 51 -24 42 14 - 87 19 11 -24 49 46 - 85 45 10 -24 37 16 - 85 7 49 -22 2 33 7 4 47 27 36 -62 - 85 14 20 -22 3 13 - 85 1 19 -22 1 53 - 85 52 32 -22 7 26 - 84 23 47 -21 58 16 - 83 57 26 -19 34 55 7 4 56 30 36 -63 - 84 3 41 -19 35 26 - 83 51 13 -19 34 26 - 84 40 12 -19 38 35 - 83 15 13 -19 31 47 - 82 56 53 -17 17 5 7 5 5 32 36 -63 - 83 2 55 -17 17 28 - 82 50 52 -17 16 43 - 83 38 12 -17 19 50 - 82 16 2 -17 14 47 - 82 3 49 -15 6 58 7 5 15 34 36 -63 - 82 9 41 -15 7 14 - 81 57 57 -15 6 42 - 82 44 0 -15 9 0 - 81 24 2 -15 5 20 - 81 16 38 -13 3 7 7 5 24 36 36 -63 - 81 22 23 -13 3 19 - 81 10 54 -13 2 56 - 81 55 56 -13 4 36 - 80 37 42 -13 2 1 - 80 34 15 -11 4 30 7 5 33 38 36 -63 - 80 39 53 -11 4 38 - 80 28 37 -11 4 23 - 81 12 49 -11 5 31 - 79 56 0 -11 3 50 - 79 55 49 - 9 10 18 7 5 42 40 37 -62 - 80 1 22 - 9 10 23 - 79 50 16 - 9 10 15 - 80 33 48 - 9 10 56 - 79 18 7 - 9 10 0 - 79 20 43 - 7 19 55 7 5 51 42 37 -62 - 79 26 12 - 7 19 57 - 79 15 14 - 7 19 54 - 79 58 14 - 7 20 13 - 78 43 28 - 7 19 55 - 78 48 29 - 5 32 50 7 6 1 44 38 -61 - 78 53 54 - 5 32 49 - 78 43 3 - 5 32 52 - 79 25 37 - 5 32 51 - 78 11 35 - 5 33 6 - 78 18 43 - 3 48 39 7 6 10 46 38 -61 - 78 24 6 - 3 48 36 - 78 13 20 - 3 48 43 - 78 55 33 - 3 48 26 - 77 42 7 - 3 49 10 - 77 51 6 - 2 7 2 7 6 19 47 39 -60 - 77 56 27 - 2 6 57 - 77 45 46 - 2 7 8 - 78 27 42 - 2 6 36 - 77 14 44 - 2 7 45 - 77 25 25 - 0 27 42 7 6 28 49 40 -60 - 77 30 44 - 0 27 36 - 77 20 6 - 0 27 49 - 78 1 49 - 0 27 4 - 76 49 14 - 0 28 36 - 77 1 25 1 9 36 7 6 37 50 41 -59 - 77 6 44 1 9 44 - 76 56 7 1 9 27 - 77 37 41 1 10 24 - 76 25 22 1 8 32 - 76 38 58 2 45 4 7 6 46 52 42 -58 - 76 44 15 2 45 13 - 76 33 40 2 44 54 - 77 15 8 2 46 1 - 76 2 59 2 43 51 - 76 17 53 4 18 53 7 6 56 53 43 -58 - 76 23 10 4 19 3 - 76 12 36 4 18 42 - 76 54 0 4 19 59 - 75 41 57 4 17 32 - 75 58 4 5 51 12 7 7 5 54 44 -57 - 76 3 21 5 51 24 - 75 52 47 5 51 0 - 76 34 10 5 52 26 - 75 22 9 5 49 45 - 75 39 23 7 22 11 7 7 14 56 45 -56 - 75 44 40 7 22 24 - 75 34 7 7 21 58 - 76 15 31 7 23 32 - 75 3 27 7 20 37 - 75 21 47 8 51 57 7 7 23 57 46 -55 - 75 27 4 8 52 10 - 75 16 29 8 51 43 - 75 57 57 8 53 24 - 74 45 47 8 50 16 - 75 5 9 10 20 36 7 7 32 58 48 -54 - 75 10 27 10 20 50 - 74 59 51 10 20 21 - 75 41 24 10 22 9 - 74 29 4 10 18 49 - 74 49 26 11 48 15 7 7 42 60 49 -54 - 74 54 45 11 48 30 - 74 44 7 11 47 59 - 75 25 48 11 49 54 - 74 13 14 11 46 23 - 74 34 34 13 14 59 7 7 51 61 51 -53 - 74 39 54 13 15 15 - 74 29 14 13 14 43 - 75 11 4 13 16 43 - 73 58 14 13 13 2 - 74 20 30 14 40 54 7 8 0 62 53 -52 - 74 25 52 14 41 11 - 74 15 8 14 40 37 - 74 57 11 14 42 43 - 73 44 0 14 38 52 - 74 7 12 16 6 4 7 8 9 63 54 -51 - 74 12 35 16 6 21 - 74 1 48 16 5 46 - 74 44 4 16 7 58 - 73 30 29 16 3 57 - 73 54 36 17 30 34 7 8 18 64 57 -50 - 74 0 2 17 30 52 - 73 49 11 17 30 16 - 74 31 42 17 32 32 - 73 17 40 17 28 23 - 73 42 42 18 54 28 7 8 27 65 59 -49 - 73 48 10 18 54 47 - 73 37 14 18 54 9 - 74 20 3 18 56 30 - 73 5 30 18 52 13 - 73 31 27 20 17 50 7 8 37 66 61 -48 - 73 36 57 20 18 9 - 73 25 56 20 17 30 - 74 9 6 20 19 56 - 72 53 58 20 15 31 - 73 20 50 21 40 43 7 8 46 66 64 -47 - 73 26 23 21 41 3 - 73 15 16 21 40 23 - 73 58 47 21 42 53 - 72 43 2 21 38 21 - 73 10 49 23 3 12 7 8 55 67 67 -46 - 73 16 26 23 3 32 - 73 5 13 23 2 51 - 73 49 8 23 5 25 - 72 32 41 23 0 46 - 73 1 25 24 25 19 7 9 4 68 70 -46 - 73 7 4 24 25 40 - 72 55 45 24 24 58 - 73 40 6 24 27 35 - 72 22 54 24 22 49 - 72 52 35 25 47 7 7 9 13 68 73 -45 - 72 58 18 25 47 29 - 72 46 52 25 46 46 - 73 31 40 25 49 27 - 72 13 40 25 44 35 - 72 44 20 27 8 41 7 9 22 69 76 -44 - 72 50 7 27 9 2 - 72 38 33 27 8 19 - 73 23 52 27 11 3 - 72 4 59 27 6 5 - 72 36 39 28 30 2 7 9 32 69 80 -43 - 72 42 30 28 30 24 - 72 30 48 28 29 39 - 73 16 39 28 32 27 - 71 56 49 28 27 23 - 72 29 32 29 51 14 7 9 41 70 83 -42 - 72 35 28 29 51 36 - 72 23 36 29 50 51 - 73 10 3 29 53 42 - 71 49 12 29 48 32 - 72 22 59 31 12 19 7 9 50 70 87 -41 - 72 29 0 31 12 42 - 72 16 59 31 11 56 - 73 4 4 31 14 50 - 71 42 6 31 9 34 - 72 17 1 32 33 21 7 9 59 70 91 -40 - 72 23 7 32 33 44 - 72 10 55 32 32 57 - 72 58 41 32 35 54 - 71 35 32 32 30 33 - 72 11 37 33 54 22 7 10 8 70 94 -39 - 72 17 49 33 54 45 - 72 5 26 33 53 58 - 72 53 56 33 56 58 - 71 29 30 33 51 32 - 72 6 50 35 15 25 7 10 18 70 98 -38 - 72 13 7 35 15 49 - 72 0 33 35 15 0 - 72 49 50 35 18 3 - 71 24 2 35 12 32 - 72 2 39 36 36 33 7 10 27 70 102 -37 - 72 9 3 36 36 57 - 71 56 16 36 36 8 - 72 46 24 36 39 13 - 71 19 7 36 33 38 - 71 59 7 37 57 48 7 10 36 69 106 -36 - 72 5 38 37 58 13 - 71 52 36 37 57 23 - 72 43 40 38 0 31 - 71 14 47 37 54 51 - 71 56 15 39 19 14 7 10 45 69 109 -35 - 72 2 54 39 19 39 - 71 49 37 39 18 49 - 72 41 39 39 21 59 - 71 11 4 39 16 15 - 71 54 5 40 40 54 7 10 54 69 113 -34 - 72 0 52 40 41 19 - 71 47 19 40 40 28 - 72 40 25 40 43 41 - 71 7 59 40 37 52 - 71 52 40 42 2 50 7 11 3 68 116 -33 - 71 59 35 42 3 16 - 71 45 45 42 2 24 - 72 39 59 42 5 38 - 71 5 35 41 59 46 - 71 52 2 43 25 6 7 11 13 68 119 -32 - 71 59 7 43 25 32 - 71 44 58 43 24 39 - 72 40 27 43 27 55 - 71 3 53 43 22 0 - 71 52 16 44 47 44 7 11 22 67 122 -31 - 71 59 31 44 48 10 - 71 45 1 44 47 17 - 72 41 51 44 50 35 - 71 2 58 44 44 36 - 71 53 26 46 10 48 7 11 31 66 125 -30 - 72 0 52 46 11 14 - 71 46 0 46 10 21 - 72 44 16 46 13 40 - 71 2 52 46 7 39 - 71 55 37 47 34 22 7 11 40 65 127 -29 - 72 3 15 47 34 48 - 71 47 59 47 33 55 - 72 47 49 47 37 15 - 71 3 42 47 31 11 - 71 58 54 48 58 28 7 11 49 64 129 -28 - 72 6 46 48 58 55 - 71 51 4 48 58 1 - 72 52 37 49 1 22 - 71 5 30 48 55 16 - 72 3 27 50 23 11 7 11 59 64 132 -27 - 72 11 33 50 23 38 - 71 55 22 50 22 44 - 72 58 48 50 26 5 - 71 8 26 50 19 58 - 72 9 23 51 48 35 7 12 8 63 134 -26 - 72 17 44 51 49 2 - 72 1 2 51 48 8 - 73 6 31 51 51 29 - 71 12 35 51 45 21 - 72 16 53 53 14 43 7 12 17 61 135 -25 - 72 25 32 53 15 10 - 72 8 15 53 14 16 - 73 16 0 53 17 37 - 71 18 8 53 11 30 - 72 26 10 54 41 41 7 12 26 60 137 -24 - 72 35 8 54 42 8 - 72 17 13 54 41 14 - 73 27 28 54 44 33 - 71 25 16 54 38 27 - 72 37 31 56 9 33 7 12 35 59 139 -23 - 72 46 50 56 9 59 - 72 28 12 56 9 6 - 73 41 14 56 12 23 - 71 34 13 56 6 20 - 72 51 14 57 38 23 7 12 44 58 140 -22 - 73 0 57 57 38 49 - 72 41 32 57 37 57 - 73 57 39 57 41 11 - 71 45 17 57 35 12 - 73 7 45 59 8 18 7 12 54 57 141 -21 - 73 17 54 59 8 44 - 72 57 37 59 7 52 - 74 17 12 59 11 2 - 71 58 48 59 5 9 - 73 27 35 60 39 23 7 13 3 56 142 -20 - 73 38 14 60 39 48 - 73 16 56 60 38 58 - 74 40 26 60 42 2 - 72 15 15 60 36 17 - 73 51 22 62 11 45 7 13 12 54 143 -19 - 74 2 35 62 12 9 - 73 40 10 62 11 20 - 75 8 7 62 14 17 - 72 35 12 62 8 43 - 74 19 59 63 45 29 7 13 21 53 143 -17 - 74 31 51 63 45 52 - 74 8 7 63 45 5 - 75 41 11 63 47 52 - 72 59 24 63 42 34 - 74 54 32 65 20 42 7 13 30 51 144 -16 - 75 7 9 65 21 4 - 74 41 55 65 20 20 - 76 20 54 65 22 54 - 73 28 51 65 17 56 - 75 36 32 66 57 32 7 13 40 50 144 -15 - 75 50 2 66 57 52 - 75 23 3 66 57 12 - 77 8 56 66 59 29 - 74 4 53 66 54 58 - 76 28 2 68 36 6 7 13 49 48 144 -14 - 76 42 35 68 36 23 - 76 13 31 68 35 49 - 78 7 36 68 37 43 - 74 49 19 68 33 48 - 77 31 58 70 16 30 7 13 58 47 144 -13 - 77 47 46 70 16 44 - 77 16 11 70 16 16 - 79 20 6 70 17 40 - 75 44 43 70 14 34 - 78 52 29 71 58 50 7 14 7 45 144 -12 - 79 9 49 71 58 58 - 78 35 10 71 58 41 - 80 51 6 71 59 24 - 76 54 50 71 57 23 - 80 35 54 73 43 7 7 14 16 44 143 -10 - 80 55 8 73 43 8 - 80 16 40 73 43 4 - 82 47 30 73 42 51 - 78 25 15 73 42 21 - 82 51 58 75 29 16 7 14 25 42 141 -9 - 83 13 37 75 29 8 - 82 30 19 75 29 22 - 85 20 0 75 27 51 - 80 24 45 75 29 29 - 85 56 37 77 16 56 7 14 35 40 139 -8 - 86 21 25 77 16 34 - 85 31 50 77 17 16 - 88 45 51 77 13 51 - 83 7 48 77 18 35 - 90 17 17 79 5 16 7 14 44 38 135 -6 - 90 46 13 79 4 33 - 89 48 20 79 5 56 - 93 34 5 78 59 42 - 86 59 40 79 9 5 - 96 43 30 80 52 7 7 14 53 36 129 -5 - 97 17 47 80 50 53 - 96 9 8 80 53 19 -100 35 17 80 42 44 - 92 47 30 80 59 23 -106 47 14 82 32 26 7 15 2 34 120 -3 -107 27 38 82 30 20 -106 6 32 82 34 30 -111 17 0 82 17 0 -102 4 23 82 45 20 -123 1 45 83 54 4 7 15 11 32 104 -2 -123 45 2 83 50 37 -122 17 48 83 57 27 -127 44 3 83 29 31 -117 48 24 84 16 4 -147 14 15 84 31 51 7 15 21 29 80 0 -147 45 44 84 26 48 -146 41 59 84 36 53 -150 34 43 83 56 45 -143 16 45 85 5 31 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1796-00902-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 19 30.5648 DE: +29 59 11.013 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 10.1 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1508) Kemi approx. diameter [km]: 18 approx. diameter ["]: .017 distance from Earth [AU]: 1.45900 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 604 number of rejected observations: 32 time covered by the observations: 1935 Mar 28 - 2011 Aug 30 1 sigma uncertainty ellipse (major, minor, PA): 0.069, 0.027, 50° remarks: * orbital elements for (1508) Kemi : Mean anomaly = 325.78354338 deg Arg. of pericenter = 92.80550076 deg Long. of node = 14.34552346 deg Inclination = 28.73204844 deg Eccentricity = 0.41756418 Semimajor axis = 2.77061397 AU Perihelion dist = 1.61370483 AU Mag: H = 11.94, G = 0.15 Epoch of elements : MJD 56182.29900000 TDT (2012 Sep 12.299) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 12 1508 Kemi 7h 10.1m UT 10.1 3 19 30.565 29 59 11.01TYC 1796-00902-1 10.6 15.6 18 1.1 1.459 1.231 53.33 -49.3558 29.972 71.52 3.99 7.1690 -0.32516 0.09757 2.65523 8.84531 -0.00456 -0.00167 2000 325.2922072012 910.00000 92.805501 14.345523 28.7320480.41756418 2.7706140 1.613704812.0 5.00.15 RATE 2.1371740 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.035 53 3.91 0.050 0 0-2 3 056129.0020120912_0902-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org