IOTA/IOTA-ES occultation update for (247) Eukrate / UCAC2 6450362 event on 2009 Jul 06, 22:27 UT Visible from Summary ------- On 2009 Jul 06 UT, the 134 km diameter asteroid (247) Eukrate will occult a 11.5 mag star in the constellation Ara for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.1 mag (the magnitude of the asteroid) for at most 9.8 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: 85 * date and approx. time of event: 2009 Jul 06, 22:19 - 2009 Jul 06, 22:34 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 9.8 * Moon: 100 % sunlit, 37° distance * Sun: 140° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .046", 96° ) * approx speed of asteroid's shadow [km/s]: 13.7220 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 6450362 by 247 Eukrate on 2009 Jul 6 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 - 59 24 4 18 0 0 22 34 34 0 154 0 - 58 40 8 ... .. .. - 57 47 18 ... .. .. - 58 52 56 17 0 0 22 34 33 1 154 -1 - 58 9 11 - 59 36 37 - 57 16 33 - 60 28 57 - 58 21 46 16 0 0 22 34 33 2 154 -2 - 57 38 10 - 59 5 17 - 56 45 44 - 59 57 24 - 57 50 32 15 0 0 22 34 33 4 154 -3 - 57 7 5 - 58 33 54 - 56 14 49 - 59 25 51 - 57 19 14 14 0 0 22 34 32 5 154 -4 - 56 35 54 - 58 2 28 - 55 43 47 - 58 54 14 - 56 47 49 13 0 0 22 34 31 6 154 -5 - 56 4 36 - 57 30 57 - 55 12 36 - 58 22 35 - 56 16 17 12 0 0 22 34 30 7 154 -5 - 55 33 9 - 56 59 19 - 54 41 15 - 57 50 50 - 55 44 36 11 0 0 22 34 29 8 155 -6 - 55 1 33 - 56 27 33 - 54 9 43 - 57 18 58 - 55 12 45 10 0 0 22 34 28 9 155 -7 - 54 29 45 - 55 55 39 - 53 37 59 - 56 46 59 - 54 40 43 9 0 0 22 34 26 10 155 -8 - 53 57 45 - 55 23 34 - 53 6 2 - 56 14 51 - 54 8 28 8 0 0 22 34 24 11 155 -9 - 53 25 31 - 54 51 18 - 52 33 49 - 55 42 32 - 53 35 59 7 0 0 22 34 22 13 155 -10 - 52 53 2 - 54 18 48 - 52 1 20 - 55 10 2 - 53 3 15 6 0 0 22 34 20 14 155 -11 - 52 20 17 - 53 46 5 - 51 28 33 - 54 37 19 - 52 30 14 5 0 0 22 34 18 15 155 -12 - 51 47 14 - 53 13 6 - 50 55 27 - 54 4 21 - 51 56 55 4 0 0 22 34 15 16 155 -13 - 51 13 52 - 52 39 49 - 50 22 1 - 53 31 8 - 51 23 16 3 0 0 22 34 13 17 155 -13 - 50 40 9 - 52 6 14 - 49 48 13 - 52 57 37 - 50 49 17 2 0 0 22 34 10 18 155 -14 - 50 6 4 - 51 32 20 - 49 14 1 - 52 23 48 - 50 14 54 1 0 0 22 34 7 19 155 -15 - 49 31 36 - 50 58 4 - 48 39 24 - 51 49 39 - 49 40 8 0 0 0 22 34 3 20 155 -16 - 48 56 42 - 50 23 24 - 48 4 21 - 51 15 7 - 49 4 56 - 1 0 0 22 34 0 22 155 -17 - 48 21 21 - 49 48 21 - 47 28 49 - 50 40 13 Latitude Latitude Latitude Latitude - 49 0 0 - 1 8 21 22 33 59 22 155 -17 0 5 39 - 2 21 31 1 35 37 - 3 48 19 - 48 0 0 - 2 48 40 22 33 53 24 155 -19 - 1 35 52 - 4 0 41 - 0 7 23 - 5 26 10 - 47 0 0 - 4 26 41 22 33 47 26 155 -20 - 3 15 4 - 5 37 34 - 1 48 3 - 7 1 42 - 46 0 0 - 6 2 20 22 33 40 27 155 -22 - 4 51 53 - 7 12 5 - 3 26 20 - 8 34 55 - 45 0 0 - 7 35 35 22 33 33 29 155 -23 - 6 26 17 - 8 44 12 - 5 2 10 -10 5 45 - 44 0 0 - 9 6 23 22 33 25 31 155 -25 - 7 58 14 -10 13 55 - 6 35 32 -11 34 10 - 43 0 0 -10 34 45 22 33 17 33 155 -26 - 9 27 42 -11 41 12 - 8 6 23 -13 0 12 - 42 0 0 -12 0 39 22 33 10 34 155 -28 -10 54 42 -13 6 3 - 9 34 44 -14 23 48 - 41 0 0 -13 24 7 22 33 1 36 155 -29 -12 19 13 -14 28 28 -11 0 35 -15 45 1 - 40 0 0 -14 45 8 22 32 53 38 155 -30 -13 41 17 -15 48 29 -12 23 57 -17 3 51 - 39 0 0 -16 3 46 22 32 45 39 155 -31 -15 0 56 -17 6 6 -13 44 50 -18 20 19 - 38 0 0 -17 20 0 22 32 37 41 155 -33 -16 18 9 -18 21 23 -15 3 17 -19 34 28 - 37 0 0 -18 33 54 22 32 28 42 155 -34 -17 33 1 -19 34 20 -16 19 20 -20 46 20 - 36 0 0 -19 45 29 22 32 20 44 155 -35 -18 45 33 -20 45 1 -17 33 1 -21 55 56 - 35 0 0 -20 54 49 22 32 11 45 155 -36 -19 55 47 -21 53 27 -18 44 23 -23 3 20 - 34 0 0 -22 1 56 22 32 2 46 155 -37 -21 3 47 -22 59 43 -19 53 28 -24 8 34 - 33 0 0 -23 6 53 22 31 54 48 155 -38 -22 9 36 -24 3 50 -21 0 20 -25 11 42 - 32 0 0 -24 9 44 22 31 45 49 155 -40 -23 13 16 -25 5 51 -22 5 1 -26 12 46 - 31 0 0 -25 10 30 22 31 37 50 156 -41 -24 14 51 -26 5 50 -23 7 35 -27 11 49 - 30 0 0 -26 9 16 22 31 28 52 156 -42 -25 14 23 -27 3 50 -24 8 6 -28 8 55 - 29 0 0 -27 6 4 22 31 20 53 156 -43 -26 11 57 -27 59 54 -25 6 35 -29 4 6 - 28 0 0 -28 0 58 22 31 11 54 156 -43 -27 7 35 -28 54 4 -26 3 7 -29 57 26 - 27 0 0 -28 54 1 22 31 3 55 156 -44 -28 1 21 -29 46 25 -26 57 44 -30 48 58 - 26 0 0 -29 45 16 22 30 55 56 156 -45 -28 53 16 -30 37 0 -27 50 31 -31 38 44 - 25 0 0 -30 34 46 22 30 47 57 156 -46 -29 43 26 -31 25 50 -28 41 29 -32 26 49 - 24 0 0 -31 22 33 22 30 38 58 156 -47 -30 31 52 -32 13 0 -29 30 42 -33 13 13 - 23 0 0 -32 8 42 22 30 30 59 157 -48 -31 18 38 -32 58 32 -30 18 14 -33 58 2 - 22 0 0 -32 53 15 22 30 22 60 157 -49 -32 3 47 -33 42 29 -31 4 7 -34 41 17 - 21 0 0 -33 36 14 22 30 15 61 157 -49 -32 47 22 -34 24 54 -31 48 24 -35 23 2 - 20 0 0 -34 17 43 22 30 7 62 158 -50 -33 29 24 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8 87 0 0 -22 51 57 22 20 4 22 214 -34 -21 53 45 -23 49 45 -20 43 21 -24 58 37 88 0 0 -21 45 17 22 20 0 20 214 -33 -20 46 9 -22 43 59 -19 34 36 -23 53 55 89 0 0 -20 36 17 22 19 56 19 214 -32 -19 36 12 -21 35 56 -18 23 29 -22 46 58 90 0 0 -19 24 56 22 19 52 17 213 -31 -18 23 51 -20 25 33 -17 9 54 -21 37 43 91 0 0 -18 11 9 22 19 48 16 213 -30 -17 9 3 -19 12 45 -15 53 50 -20 26 6 92 0 0 -16 54 53 22 19 45 14 213 -28 -15 51 44 -17 57 31 -14 35 13 -19 12 4 93 0 0 -15 36 6 22 19 42 13 213 -27 -14 31 51 -16 39 48 -13 14 0 -17 55 34 94 0 0 -14 14 44 22 19 39 11 212 -26 -13 9 23 -15 19 31 -11 50 8 -16 36 34 95 0 0 -12 50 46 22 19 36 9 212 -24 -11 44 16 -13 56 40 -10 23 36 -15 15 1 96 0 0 -11 24 10 22 19 34 8 212 -23 -10 16 29 -12 31 13 - 8 54 21 -13 50 53 97 0 0 - 9 54 55 22 19 32 6 212 -22 - 8 46 1 -11 3 8 - 7 22 24 -12 24 10 98 0 0 - 8 22 59 22 19 31 4 212 -20 - 7 12 52 - 9 32 24 - 5 47 42 -10 54 50 99 0 0 - 6 48 24 22 19 30 2 211 -19 - 5 37 1 - 7 59 2 .. .. .. - 9 22 53 100 0 0 - 5 11 11 22 19 30 0 211 -17 .. .. .. - 6 23 3 .. .. .. - 7 48 19 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 6450362 * constellation : Ara * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 27 22.9907 DE: -58 20 51.796 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .042, .040 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (247) Eukrate approx. diameter [km]: 134 approx. diameter ["]: .078 distance from Earth [AU]: 2.35800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 444 number of rejected observations: 102 time covered by the observations: 1901 Oct 12 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.024, 102° remarks: * orbital elements for (247) Eukrate : Mean anomaly = 235.82678287 deg Arg. of pericenter = 54.87139385 deg Long. of node = 0.22062363 deg Inclination = 24.99364604 deg Eccentricity = 0.24415073 Semimajor axis = 2.74001070 AU Perihelion dist = 2.07103509 AU Mag: H = 7.92, G = 0.15 Epoch of elements : MJD 55018.93500000 TDT (2009 Jul 06.935) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 6 247 Eukrate 22h 27.0m UT 11.5 17 27 22.991-58 20 51.80UCAC2 6450362 0.0 13.1 134 9.8 2.358 -3.380 11.23 0.0556 -58.351 -155.54 22.60 22.4505 0.09049 0.21514 -7.13666 3.00911 0.00213 0.00289 2000 233.8851362009 628.00000 54.871394 0.220624 24.9936460.24415073 2.7400107 2.0710351 8.0 5.00.15 RATE 2.1730800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.057 0.046 96 1.60 0.047 0 54545.5020090706_450362 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org