IOTA/IOTA-ES occultation update for (15) Eunomia / TYC 1930-00091-1 event on 2007 Nov 10, 08:39 UT Visible from Caribbean, S USA, Mexico Summary ------- On 2007 Nov 10 UT, the 255 km diameter asteroid (15) Eunomia will occult a 9.5 mag star in the constellation Gemini for observers along a path across Caribbean, S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 9.4 mag (the magnitude of the asteroid) for at most 40.9 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: 100 * date and approx. time of event: 2007 Nov 10, 08:22 - 2007 Nov 10, 08:55 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 40.9 * Moon: 0 % sunlit, 116° distance * Sun: 111° distance * rough path description: Caribbean, S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 260 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .021 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .021", 103° ) * approx speed of asteroid's shadow [km/s]: 6.2282 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1930-00091-1 by 15 Eunomia on 2007 Nov 10 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 -154 0 0 .. .. .. .. .. .. .. .. .. .. .. .. 18 25 25 .. .. .. 18 42 44 -153 0 0 17 36 15 8 22 16 1 63 -68 .. .. .. 18 54 50 .. .. .. 19 12 4 -152 0 0 18 5 19 8 22 16 2 63 -69 16 46 44 19 23 33 16 29 23 19 40 43 -151 0 0 18 33 40 8 22 17 3 63 -70 17 15 25 19 51 34 16 58 9 20 8 40 -150 0 0 19 1 19 8 22 18 4 64 -70 17 43 24 20 18 54 17 26 13 20 35 55 -149 0 0 19 28 16 8 22 20 5 64 -71 18 10 41 20 45 31 17 53 34 21 2 28 -148 0 0 19 54 31 8 22 22 6 64 -72 18 37 15 21 11 27 18 20 12 21 28 20 -147 0 0 20 20 4 8 22 24 7 65 -73 19 3 7 21 36 41 18 46 8 21 53 30 -146 0 0 20 44 55 8 22 26 8 65 -74 19 28 16 22 1 13 19 11 22 22 17 58 -145 0 0 21 9 3 8 22 29 9 65 -75 19 52 43 22 25 3 19 35 53 22 41 44 -144 0 0 21 32 29 8 22 32 10 66 -76 20 16 28 22 48 11 19 59 41 23 4 48 -143 0 0 21 55 14 8 22 35 11 66 -76 20 39 30 23 10 38 20 22 47 23 27 11 -142 0 0 22 17 16 8 22 39 12 67 -77 21 1 49 23 32 23 20 45 11 23 48 52 -141 0 0 22 38 36 8 22 43 13 67 -78 21 23 27 23 53 26 21 6 52 24 9 52 -140 0 0 22 59 14 8 22 47 14 67 -79 21 44 21 24 13 48 21 27 50 24 30 10 -139 0 0 23 19 11 8 22 52 15 68 -79 22 4 34 24 33 29 21 48 7 24 49 47 -138 0 0 23 38 26 8 22 57 16 68 -80 22 24 5 24 52 28 22 7 41 25 8 43 -137 0 0 23 56 59 8 23 2 17 69 -80 22 42 54 25 10 46 22 26 33 25 26 58 -136 0 0 24 14 51 8 23 7 18 69 -81 23 1 1 25 28 23 22 44 43 25 44 32 -135 0 0 24 32 2 8 23 13 19 69 -81 23 18 26 25 45 20 23 2 12 26 1 25 -134 0 0 24 48 32 8 23 19 20 70 -81 23 35 10 26 1 36 23 18 58 26 17 38 -133 0 0 25 4 21 8 23 25 21 70 -81 23 51 12 26 17 11 23 35 3 26 33 10 -132 0 0 25 19 29 8 23 31 22 71 -81 24 6 32 26 32 6 23 50 27 26 48 3 -131 0 0 25 33 56 8 23 38 23 71 -81 24 21 12 26 46 21 24 5 9 27 2 15 -130 0 0 25 47 42 8 23 45 24 71 -81 24 35 10 26 59 56 24 19 10 27 15 47 -129 0 0 26 0 48 8 23 52 25 72 -81 24 48 28 27 12 51 24 32 30 27 28 39 -128 0 0 26 13 14 8 23 59 26 72 -81 25 1 5 27 25 6 24 45 9 27 40 52 -127 0 0 26 25 0 8 24 7 27 73 -80 25 13 1 27 36 41 24 57 8 27 52 25 -126 0 0 26 36 6 8 24 15 27 73 -80 25 24 16 27 47 37 25 8 25 28 3 19 -125 0 0 26 46 31 8 24 23 28 73 -79 25 34 51 27 57 54 25 19 2 28 13 34 -124 0 0 26 56 17 8 24 31 29 74 -79 25 44 45 28 7 31 25 28 58 28 23 9 -123 0 0 27 5 23 8 24 39 30 74 -78 25 53 59 28 16 29 25 38 14 28 32 5 -122 0 0 27 13 49 8 24 48 31 75 -77 26 2 33 28 24 48 25 46 49 28 40 23 -121 0 0 27 21 36 8 24 57 32 75 -77 26 10 26 28 32 28 25 54 45 28 48 1 -120 0 0 27 28 43 8 25 6 33 75 -76 26 17 40 28 39 29 26 1 59 28 55 1 -119 0 0 27 35 11 8 25 15 34 76 -75 26 24 13 28 45 51 26 8 34 29 1 22 -118 0 0 27 41 0 8 25 25 35 76 -74 26 30 7 28 51 34 26 14 29 29 7 4 -117 0 0 27 46 8 8 25 35 36 77 -74 26 35 20 28 56 39 26 19 43 29 12 7 -116 0 0 27 50 38 8 25 45 37 77 -73 26 39 54 29 1 5 26 24 17 29 16 32 -115 0 0 27 54 28 8 25 55 38 77 -72 26 43 47 29 4 52 26 28 11 29 20 19 -114 0 0 27 57 39 8 26 5 39 78 -71 26 47 0 29 8 0 26 31 25 29 23 26 -113 0 0 28 0 10 8 26 16 39 78 -70 26 49 34 29 10 29 26 33 59 29 25 55 -112 0 0 28 2 2 8 26 27 40 78 -70 26 51 27 29 12 20 26 35 52 29 27 45 -111 0 0 28 3 15 8 26 38 41 79 -69 26 52 40 29 13 32 26 37 6 29 28 57 -110 0 0 28 3 48 8 26 49 42 79 -68 26 53 13 29 14 4 26 37 38 29 29 30 -109 0 0 28 3 41 8 27 0 43 79 -67 26 53 5 29 13 58 26 37 31 29 29 24 -108 0 0 28 2 54 8 27 12 44 80 -66 26 52 17 29 13 13 26 36 43 29 28 39 -107 0 0 28 1 28 8 27 24 45 80 -65 26 50 49 29 11 48 26 35 14 29 27 14 -106 0 0 27 59 21 8 27 36 46 80 -65 26 48 40 29 9 44 26 33 4 29 25 11 -105 0 0 27 56 35 8 27 48 47 81 -64 26 45 50 29 7 1 26 30 14 29 22 28 -104 0 0 27 53 8 8 28 1 48 81 -63 26 42 19 29 3 38 26 26 42 29 19 6 -103 0 0 27 49 0 8 28 13 49 81 -62 26 38 7 28 59 35 26 22 29 29 15 4 -102 0 0 27 44 12 8 28 26 49 81 -61 26 33 14 28 54 52 26 17 34 29 10 22 -101 0 0 27 38 43 8 28 39 50 82 -60 26 27 39 28 49 29 26 11 58 29 5 0 -100 0 0 27 32 33 8 28 53 51 82 -59 26 21 22 28 43 25 26 5 39 28 58 58 - 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11 0 0 -27 28 4 8 54 56 17 312 40 -28 58 54 -25 57 42 -29 18 58 -25 37 53 - 10 0 0 -28 11 40 8 55 2 16 312 41 -29 42 8 -26 41 42 -30 2 6 -26 21 58 - 9 0 0 -28 54 32 8 55 8 15 311 42 -30 24 35 -27 24 57 -30 44 28 -27 5 18 - 8 0 0 -29 36 37 8 55 13 13 311 43 -31 6 16 -28 7 26 -31 26 4 -27 47 52 - 7 0 0 -30 17 56 8 55 17 12 310 43 -31 47 11 -28 49 9 -32 6 53 -28 29 41 - 6 0 0 -30 58 28 8 55 21 11 310 44 -32 27 18 -29 30 6 -32 46 54 -29 10 43 - 5 0 0 -31 38 13 8 55 25 10 309 45 -33 6 38 -30 10 16 -33 26 9 -29 50 59 - 4 0 0 -32 17 11 8 55 28 9 309 46 -33 45 10 -30 49 40 -34 4 36 -30 30 27 - 3 0 0 -32 55 22 8 55 31 8 308 47 -34 22 55 -31 28 16 -34 42 15 -31 9 9 - 2 0 0 -33 32 45 8 55 33 7 307 47 -34 59 53 -32 6 5 -35 19 7 -31 47 4 - 1 0 0 -34 9 22 8 55 35 6 307 48 -35 36 3 -32 43 7 -35 55 12 -32 24 12 0 0 0 -34 45 11 8 55 37 5 306 49 -36 11 26 -33 19 22 -36 30 29 -33 0 33 1 0 0 -35 20 13 8 55 39 4 306 49 -36 46 3 -33 54 50 -37 5 0 -33 36 6 2 0 0 -35 54 29 8 55 40 3 305 50 -37 19 52 -34 29 32 -37 38 43 -34 10 54 3 0 0 -36 27 58 8 55 40 2 305 50 -37 52 56 -35 3 27 -38 11 41 -34 44 54 4 0 0 -37 0 41 8 55 41 1 304 51 -38 25 13 -35 36 36 .. .. .. -35 18 9 5 0 0 .. .. .. .. .. .. .. .. .. .. .. .. -36 8 59 .. .. .. -35 50 37 Data for the target star ------------------------ * name: TYC 1930-00091-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 58 55.5011 DE: +26 01 51.729 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .019 ) * V mag [mag]: 9.5 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15) Eunomia approx. diameter [km]: 255 approx. diameter ["]: .195 distance from Earth [AU]: 1.80100 * orbital information: orbit source: Preston date of fit: 2007 Nov 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1580 number of rejected observations: 168 time covered by the observations: 1905 Jan 15 - 2007 Nov 04 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.009, 117° remarks: * orbital elements for (15) Eunomia : Mean anomaly = 44.06415542 deg Arg. of pericenter = 97.89692105 deg Long. of node = 293.26768156 deg Inclination = 11.73826362 deg Eccentricity = 0.18742085 Semimajor axis = 2.64403868 AU Perihelion dist = 2.14849070 AU Mag: H = 5.27, G = 0.23 Epoch of elements : MJD 54414.36000000 TDT (2007 Nov 10.360) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 10 15 Eunomia 8h 39.0m UT 9.5 7 58 55.501 26 1 51.73TYC 1930-00091-1 10.3 9.4 255 40.9 1.801 1.092 -8.80 -59.148 26.033 46.23 -17.07 8.6499 -.10188 -.17290 3.01847 -1.80182 -0.00526 0.00087 2000 43.0646411200711 6.00000 97.896921293.267682 11.7382640.187420852.644038682.148490705.285 0.23 RATE 2.2924632 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.021 0.021 102.8 1.110 0.021 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Nov 07, 04:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org