IOTA/IOTA-ES occultation update for (694) Ekard / TYC 0501-00180-1 event on 2009 Jun 03, 23:24 UT Visible from Summary ------- On 2009 Jun 03 UT, the 99 km diameter asteroid (694) Ekard will occult a 10.1 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 12.4 mag (the magnitude of the asteroid) for at most 8.6 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: 97 * date and approx. time of event: 2009 Jun 03, 23:15 - 2009 Jun 03, 23:28 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 8.6 * Moon: 86 % sunlit, 101° distance * Sun: 121° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .025", 80° ) * approx speed of asteroid's shadow [km/s]: 11.5738 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0501-00180-1 by 694 Ekard on 2009 Jun 3 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 - 1 16 9 -80 0 0 23 15 20 2 67 -32 4 49 44 - 9 27 13 8 53 12 ... .. .. 9 15 39 -79 0 0 23 15 21 4 57 -33 13 28 25 4 31 51 16 30 16 0 17 43 Latitude Latitude Latitude Latitude 10 0 0 -78 54 32 23 15 21 4 56 -33 -79 27 4 -78 22 5 -79 52 30 -77 56 49 11 0 0 -78 46 50 23 15 21 5 55 -34 -79 19 43 -78 14 2 -79 45 26 -77 48 30 12 0 0 -78 38 46 23 15 21 5 54 -34 -79 12 1 -78 5 35 -79 38 2 -77 39 46 13 0 0 -78 30 19 23 15 22 5 53 -34 -79 3 57 -77 56 45 -79 30 16 -77 30 38 14 0 0 -78 21 27 23 15 22 5 52 -34 -78 55 30 -77 47 30 -79 22 8 -77 21 4 15 0 0 -78 12 11 23 15 22 6 51 -34 -78 46 39 -77 37 48 -79 13 36 -77 11 3 16 0 0 -78 2 27 23 15 22 6 50 -34 -78 37 22 -77 27 39 -79 4 40 -77 0 34 17 0 0 -77 52 16 23 15 23 6 49 -34 -78 27 38 -77 17 0 -78 55 18 -76 49 34 18 0 0 -77 41 36 23 15 23 6 48 -35 -78 17 27 -77 5 51 -78 45 29 -76 38 3 19 0 0 -77 30 25 23 15 23 7 47 -35 -78 6 46 -76 54 10 -78 35 12 -76 25 58 20 0 0 -77 18 41 23 15 24 7 46 -35 -77 55 34 -76 41 55 -78 24 25 -76 13 19 21 0 0 -77 6 23 23 15 24 7 45 -35 -77 43 49 -76 29 5 -78 13 5 -76 0 3 22 0 0 -76 53 29 23 15 24 8 44 -35 -77 31 29 -76 15 36 -78 1 13 -75 46 9 23 0 0 -76 39 56 23 15 25 8 43 -35 -77 18 32 -76 1 28 -77 48 44 -75 31 33 24 0 0 -76 25 43 23 15 25 8 42 -36 -77 4 57 -75 46 38 -77 35 38 -75 16 14 25 0 0 -76 10 47 23 15 26 9 41 -36 -76 50 40 -75 31 3 -77 21 53 -75 0 9 26 0 0 -75 55 6 23 15 26 9 40 -36 -76 35 40 -75 14 41 -77 7 25 -74 43 15 27 0 0 -75 38 36 23 15 27 9 39 -36 -76 19 53 -74 57 28 -76 52 12 -74 25 30 28 0 0 -75 21 14 23 15 27 10 38 -36 -76 3 16 -74 39 22 -76 36 11 -74 6 50 29 0 0 -75 2 58 23 15 28 10 37 -36 -75 45 47 -74 20 20 -76 19 19 -73 47 11 30 0 0 -74 43 44 23 15 29 10 37 -37 -75 27 22 -74 0 16 -76 1 32 -73 26 30 31 0 0 -74 23 27 23 15 30 11 36 -37 -75 7 56 -73 39 9 -75 42 47 -73 4 43 32 0 0 -74 2 3 23 15 30 11 35 -37 -74 47 27 -73 16 52 -75 23 1 -72 41 45 33 0 0 -73 39 29 23 15 31 12 34 -37 -74 25 49 -72 53 21 -75 2 7 -72 17 32 34 0 0 -73 15 38 23 15 32 12 33 -38 -74 2 57 -72 28 32 -74 40 2 -71 51 57 35 0 0 -72 50 25 23 15 33 13 32 -38 -73 38 46 -72 2 18 -74 16 40 -71 24 56 36 0 0 -72 23 44 23 15 35 13 31 -38 -73 13 11 -71 34 34 -73 51 56 -70 56 22 37 0 0 -71 55 29 23 15 36 14 30 -38 -72 46 4 -71 5 12 -73 25 43 -70 26 9 38 0 0 -71 25 33 23 15 37 14 29 -39 -72 17 19 -70 34 5 -72 57 54 -69 54 8 39 0 0 -70 53 47 23 15 39 15 28 -39 -71 46 47 -70 1 5 -72 28 22 -69 20 12 40 0 0 -70 20 3 23 15 41 16 27 -39 -71 14 22 -69 26 4 -71 56 58 -68 44 12 41 0 0 -69 44 12 23 15 43 16 26 -39 -70 39 52 -68 48 53 -71 23 34 -68 5 58 42 0 0 -69 6 3 23 15 45 17 25 -40 -70 3 9 -68 9 19 -70 47 59 -67 25 20 43 0 0 -68 25 25 23 15 47 18 24 -40 -69 24 1 -67 27 13 -70 10 2 -66 42 6 44 0 0 -67 42 5 23 15 49 19 23 -40 -68 42 15 -66 42 22 -69 29 31 -65 56 4 45 0 0 -66 55 51 23 15 52 20 22 -40 -67 57 39 -65 54 32 -68 46 13 -65 7 0 46 0 0 -66 6 28 23 15 55 21 21 -41 -67 9 58 -65 3 29 -67 59 53 -64 14 40 47 0 0 -65 13 40 23 15 59 22 20 -41 -66 18 56 -64 8 56 -67 10 16 -63 18 48 48 0 0 -64 17 9 23 16 3 23 19 -41 -65 24 16 -63 10 37 -66 17 4 -62 19 6 49 0 0 -63 16 37 23 16 7 24 18 -42 -64 25 39 -62 8 13 -65 19 59 -61 15 16 50 0 0 -62 11 44 23 16 12 25 17 -42 -63 22 45 -61 1 24 -64 18 39 -60 6 59 51 0 0 -61 2 8 23 16 17 26 16 -42 -62 15 11 -59 49 49 -63 12 44 -58 53 53 52 0 0 -59 47 27 23 16 23 27 15 -43 -61 2 36 -58 33 5 -62 1 49 -57 35 36 53 0 0 -58 27 17 23 16 30 29 14 -43 -59 44 34 -57 10 50 -60 45 30 -56 11 46 54 0 0 -57 1 13 23 16 37 30 13 -43 -58 20 41 -55 42 40 -59 23 21 -54 41 59 55 0 0 -55 28 50 23 16 45 32 12 -43 -56 50 29 -54 8 10 -57 54 55 -53 5 52 56 0 0 -53 49 43 23 16 55 34 11 -44 -55 13 33 -52 26 56 -56 19 44 -51 23 2 57 0 0 -52 3 29 23 17 5 36 10 -44 -53 29 28 -50 38 38 -54 37 23 -49 33 9 58 0 0 -50 9 46 23 17 17 38 9 -44 -51 37 50 -48 42 53 -52 47 26 -47 35 53 59 0 0 -48 8 14 23 17 30 40 8 -44 -49 38 18 -46 39 26 -50 49 31 -45 30 59 60 0 0 -45 58 42 23 17 45 42 7 -43 -47 30 37 -44 28 6 -48 43 20 -43 18 18 61 0 0 -43 41 0 23 18 1 44 6 -43 -45 14 37 -42 8 49 -46 28 42 -40 57 48 62 0 0 -41 15 12 23 18 19 47 4 -43 -42 50 16 -39 41 37 -44 5 32 -38 29 34 63 0 0 -38 41 29 23 18 39 49 3 -42 -40 17 44 -37 6 46 -41 33 57 -35 53 52 64 0 0 -36 0 14 23 19 0 52 1 -41 -37 37 20 -34 24 42 -38 54 17 -33 11 12 65 0 0 -33 12 3 23 19 23 55 360 -40 -34 49 41 -31 36 3 -36 7 3 -30 22 12 66 0 0 -30 17 46 23 19 48 58 358 -39 -31 55 31 -28 41 40 -33 13 1 -27 27 46 67 0 0 -27 18 25 23 20 15 61 355 -38 -28 55 54 -25 42 37 -30 13 11 -24 28 57 68 0 0 -24 15 12 23 20 42 64 352 -37 -25 52 0 -22 40 5 -27 8 45 -21 26 57 69 0 0 -21 9 28 23 21 11 67 348 -35 -22 45 10 -19 35 24 -24 1 4 -18 23 5 70 0 0 -18 2 35 23 21 41 69 343 -33 -19 36 51 -16 29 56 -20 51 36 -15 18 42 71 0 0 -14 55 58 23 22 12 72 337 -31 -16 28 28 -13 25 2 -17 41 48 -12 15 7 72 0 0 -11 50 57 23 22 42 74 329 -29 -13 21 25 -10 22 0 -14 33 7 - 9 13 36 73 0 0 - 8 48 45 23 23 13 76 319 -27 -10 16 59 - 7 21 59 -11 26 52 - 6 15 14 74 0 0 - 5 50 26 23 23 43 77 307 -25 - 7 16 15 - 4 25 59 - 8 24 13 - 3 21 1 75 0 0 - 2 56 51 23 24 13 78 293 -23 - 4 20 10 - 1 34 50 - 5 26 7 - 0 31 42 76 0 0 - 0 8 42 23 24 42 77 280 -21 - 1 29 28 1 10 51 - 2 33 22 2 12 7 77 0 0 2 33 31 23 25 10 76 268 -19 1 15 19 3 50 36 0 13 29 4 50 0 78 0 0 5 9 29 23 25 36 75 258 -16 3 53 49 6 24 8 2 54 0 7 21 40 79 0 0 7 39 1 23 26 2 73 251 -14 6 25 49 8 51 16 5 28 0 9 46 59 80 0 0 10 2 3 23 26 27 71 246 -12 8 51 14 11 11 58 7 55 20 12 5 56 81 0 0 12 18 36 23 26 50 69 242 -10 11 10 5 13 26 17 10 16 3 14 18 33 82 0 0 14 28 48 23 27 12 67 238 -9 13 22 29 15 34 21 12 30 13 16 24 58 83 0 0 16 32 48 23 27 33 65 236 -7 15 28 35 17 36 18 14 38 0 18 25 22 84 0 0 18 30 48 23 27 52 63 234 -5 17 28 36 19 32 22 16 39 37 20 19 57 85 0 0 20 23 3 23 28 11 61 233 -3 19 22 45 21 22 46 18 35 16 22 8 57 86 0 0 22 9 48 23 28 28 60 232 -2 21 11 17 23 7 46 20 25 14 23 52 37 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0501-00180-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 28 10.2598 DE: +01 55 50.161 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .020 ) * V mag [mag]: 10.1 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (694) Ekard approx. diameter [km]: 99 approx. diameter ["]: .105 distance from Earth [AU]: 1.29700 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 809 number of rejected observations: 78 time covered by the observations: 1909 Nov 09 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.037, 0.015, 74° remarks: * orbital elements for (694) Ekard : Mean anomaly = 330.95781994 deg Arg. of pericenter = 110.88139759 deg Long. of node = 230.40559117 deg Inclination = 15.84277844 deg Eccentricity = 0.32560146 Semimajor axis = 2.66901003 AU Perihelion dist = 1.79997647 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 54985.97500000 TDT (2009 Jun 03.975) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 3 694 Ekard 23h 24.3m UT 10.1 20 28 10.260 1 55 50.16TYC 0501-00180-1 11.1 12.4 99 8.6 1.297 1.093 41.16 63.4296 1.919 -171.50 22.42 23.4045 0.20016 -0.07893 2.41946 6.06800 -0.00384 -0.00203 2000 329.6072512009 529.00000110.881398230.405591 15.8427780.32560146 2.6690100 1.7999765 9.2 5.00.15 RATE 2.2603660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.025 80 1.39 0.041 0 54581.5020090603_0180-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org