IOTA/IOTA-ES occultation update for (694) Ekard / UCAC2 35481657 event on 2009 Jul 07, 11:42 UT Visible from Summary ------- On 2009 Jul 07 UT, the 99 km diameter asteroid (694) Ekard will occult a 11.0 mag star in the constellation Delphinus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 11.6 mag (the magnitude of the asteroid) for at most 13.9 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: 94 * date and approx. time of event: 2009 Jul 07, 11:27 - 2009 Jul 07, 11:56 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 13.9 * Moon: 100 % sunlit, 39° distance * Sun: 142° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 104 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .034", 80° ) * approx speed of asteroid's shadow [km/s]: 7.1445 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 35481657 by 694 Ekard on 2009 Jul 7 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 ' " Longitude Longitude Longitude Longitude - 97 9 38 -72 0 0 11 27 58 1 308 -26 - 94 37 38 - 99 34 46 ... .. .. -101 43 11 -101 1 47 -71 0 0 11 27 58 2 311 -28 - 98 47 40 -103 11 13 - 96 39 27 -105 6 42 Latitude Latitude Latitude Latitude -103 0 0 -70 25 26 11 27 59 3 313 -29 -69 47 41 -71 3 21 -69 13 7 -71 38 23 -104 0 0 -70 6 44 11 27 59 4 314 -29 -69 28 31 -70 45 9 -68 53 29 -71 20 39 -105 0 0 -69 47 14 11 28 0 4 315 -29 -69 8 30 -70 26 9 -68 33 1 -71 2 7 -106 0 0 -69 26 52 11 28 0 5 316 -30 -68 47 37 -70 6 18 -68 11 40 -70 42 46 -107 0 0 -69 5 36 11 28 1 5 317 -30 -68 25 49 -69 45 35 -67 49 23 -70 22 33 -108 0 0 -68 43 23 11 28 2 6 318 -31 -68 3 3 -69 23 56 -67 26 8 -70 1 26 -109 0 0 -68 20 12 11 28 3 6 319 -31 -67 39 18 -69 1 19 -67 1 52 -69 39 22 -110 0 0 -67 55 59 11 28 4 7 320 -32 -67 14 30 -68 37 42 -66 36 32 -69 16 17 -111 0 0 -67 30 41 11 28 5 7 321 -32 -66 48 37 -68 13 1 -66 10 6 -68 52 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94 -55 13 36 38 12 11 37 14 15 27 11 32 12 -179 0 0 14 0 45 11 46 10 66 96 -53 14 42 38 13 18 38 15 20 59 12 39 42 -180 0 0 15 5 34 11 46 30 65 98 -52 15 46 57 14 23 58 16 24 52 13 45 30 179 0 0 16 8 42 11 46 51 64 100 -51 16 49 37 15 27 36 17 27 5 14 49 36 178 0 0 17 10 11 11 47 10 63 101 -50 17 50 37 16 29 33 18 27 39 15 52 0 177 0 0 18 10 0 11 47 29 62 102 -49 18 49 58 17 29 51 19 26 35 16 52 45 176 0 0 19 8 12 11 47 48 61 103 -48 19 47 43 18 28 31 20 23 55 17 51 50 175 0 0 20 4 47 11 48 6 60 104 -47 20 43 51 19 25 33 21 19 39 18 49 18 174 0 0 20 59 47 11 48 24 59 105 -45 21 38 25 20 21 0 22 13 49 19 45 9 173 0 0 21 53 13 11 48 41 58 106 -44 22 31 26 21 14 52 23 6 27 20 39 25 172 0 0 22 45 7 11 48 58 57 106 -43 23 22 54 22 7 11 23 57 33 21 32 8 171 0 0 23 35 30 11 49 14 56 107 -42 24 12 53 22 57 58 24 47 9 22 23 18 170 0 0 24 24 23 11 49 30 55 107 -41 25 1 23 23 47 16 25 35 17 23 12 58 169 0 0 25 11 49 11 49 45 54 108 -40 25 48 25 24 35 5 26 21 59 24 1 9 168 0 0 25 57 49 11 50 0 53 108 -39 26 34 2 25 21 27 27 7 15 24 47 53 167 0 0 26 42 24 11 50 15 52 108 -38 27 18 15 26 6 24 27 51 8 25 33 11 166 0 0 27 25 36 11 50 29 51 108 -37 28 1 6 26 49 58 28 33 39 26 17 5 165 0 0 28 7 27 11 50 42 50 108 -36 28 42 36 27 32 10 29 14 51 26 59 36 164 0 0 28 47 58 11 50 55 49 108 -35 29 22 47 28 13 2 29 54 43 27 40 47 163 0 0 29 27 12 11 51 8 48 108 -35 30 1 41 28 52 36 30 33 19 28 20 39 162 0 0 30 5 9 11 51 21 47 108 -34 30 39 19 29 30 52 31 10 40 28 59 14 161 0 0 30 41 52 11 51 33 46 108 -33 31 15 43 30 7 54 31 46 47 29 36 32 160 0 0 31 17 21 11 51 44 45 108 -32 31 50 55 30 43 41 32 21 42 30 12 37 159 0 0 31 51 39 11 51 56 44 107 -31 32 24 55 31 18 17 32 55 26 30 47 29 158 0 0 32 24 47 11 52 6 43 107 -30 32 57 46 31 51 42 33 28 2 31 21 10 157 0 0 32 56 47 11 52 17 42 107 -29 33 29 29 32 23 58 33 59 30 31 53 41 156 0 0 33 27 39 11 52 27 41 107 -28 34 0 6 32 55 6 34 29 52 32 25 5 155 0 0 33 57 26 11 52 37 40 106 -28 34 29 37 33 25 9 34 59 9 32 55 22 154 0 0 34 26 8 11 52 47 39 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100 -16 39 56 26 38 57 46 40 23 19 38 30 41 139 0 0 39 42 8 11 54 40 27 99 -16 40 11 17 39 12 54 40 38 3 38 45 56 138 0 0 39 56 19 11 54 45 26 98 -15 40 25 21 39 27 13 40 52 0 39 0 22 137 0 0 40 9 44 11 54 51 25 98 -14 40 38 39 39 40 45 41 5 11 39 14 1 136 0 0 40 22 23 11 54 56 24 97 -14 40 51 11 39 53 31 41 17 37 39 26 53 135 0 0 40 34 16 11 55 1 24 97 -13 41 2 58 40 5 30 41 29 18 39 38 59 134 0 0 40 45 25 11 55 6 23 96 -12 41 14 1 40 16 45 41 40 15 39 50 18 133 0 0 40 55 49 11 55 11 22 95 -12 41 24 19 40 27 14 41 50 29 40 0 53 132 0 0 41 5 29 11 55 16 21 95 -11 41 33 54 40 37 0 41 59 59 40 10 43 131 0 0 41 14 26 11 55 20 21 94 -11 41 42 46 40 46 1 42 8 46 40 19 49 130 0 0 41 22 39 11 55 24 20 94 -10 41 50 55 40 54 19 42 16 52 40 28 11 129 0 0 41 30 10 11 55 28 19 93 -9 41 58 22 41 1 54 42 24 15 40 35 49 128 0 0 41 36 58 11 55 32 18 92 -9 42 5 7 41 8 46 42 30 57 40 42 45 127 0 0 41 43 5 11 55 36 18 92 -8 42 11 10 41 14 55 42 36 57 40 48 57 126 0 0 41 48 30 11 55 40 17 91 -7 42 16 32 41 20 23 42 42 17 40 54 27 125 0 0 41 53 13 11 55 43 16 91 -7 42 21 13 41 25 9 42 46 55 40 59 15 124 0 0 41 57 15 11 55 46 16 90 -6 42 25 13 41 29 12 42 50 53 41 3 21 123 0 0 42 0 35 11 55 50 15 89 -6 42 28 32 41 32 35 42 54 11 41 6 44 122 0 0 42 3 15 11 55 53 14 89 -5 42 31 10 41 35 15 42 56 48 41 9 26 121 0 0 42 5 14 11 55 55 13 88 -4 42 33 8 41 37 15 42 58 45 41 11 26 120 0 0 42 6 31 11 55 58 13 87 -4 42 34 25 41 38 33 43 0 2 41 12 45 119 0 0 42 7 8 11 56 1 12 87 -3 42 35 2 41 39 9 43 0 39 41 13 21 118 0 0 42 7 3 11 56 3 11 86 -2 42 34 58 41 39 4 43 0 35 41 13 16 117 0 0 42 6 18 11 56 5 10 85 -2 42 34 13 41 38 18 42 59 51 41 12 29 116 0 0 42 4 51 11 56 7 10 85 -1 42 32 47 41 36 50 42 58 26 41 11 0 115 0 0 42 2 43 11 56 9 9 84 -1 42 30 41 41 34 40 42 56 21 41 8 48 114 0 0 41 59 53 11 56 11 8 83 0 42 27 53 41 31 48 42 53 35 41 5 55 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 35481657 * constellation : Delphinus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 27 04.5310 DE: +10 19 32.609 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .042, .027 ) * V mag [mag]: 11.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (694) Ekard approx. diameter [km]: 99 approx. diameter ["]: .134 distance from Earth [AU]: 1.02100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 807 number of rejected observations: 78 time covered by the observations: 1909 Nov 09 - 2008 Jan 15 1 sigma uncertainty ellipse (major, minor, PA): 0.050, 0.020, 73° remarks: * orbital elements for (694) Ekard : Mean anomaly = 338.53880162 deg Arg. of pericenter = 110.87648772 deg Long. of node = 230.40282919 deg Inclination = 15.84237343 deg Eccentricity = 0.32563092 Semimajor axis = 2.66918113 AU Perihelion dist = 1.80001321 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 55019.48800000 TDT (2009 Jul 07.488) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 7 694 Ekard 11h 42.1m UT 11.0 20 27 4.531 10 19 32.61UCAC2 35481657 0.0 11.6 99 13.9 1.021 -1.233 29.57 -154.3441 10.317 5.71 22.54 11.7024 -0.24979 -0.15307 -2.11140 3.43560 -0.00157 -0.00263 2000 336.3943732009 628.00000110.876488230.402829 15.8423730.32563092 2.6691811 1.8000132 9.2 5.00.15 RATE 2.2601490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.034 80 1.46 0.061 0 54545.5020090707_481657 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org