IOTA/IOTA-ES occultation update for (103) Hera / TYC 0818-00114-1 event on 2007 Nov 04, 09:15 UT Visible from N Canada Summary ------- On 2007 Nov 04 UT, the 91 km diameter asteroid (103) Hera will occult a 11.7 mag star in the constellation Cancer for observers along a path across N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.2 mag (the magnitude of the asteroid) for at most 5.4 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: 74 * date and approx. time of event: 2007 Nov 04, 09:11 - 2007 Nov 04, 09:20 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 5.4 * Moon: 25 % sunlit, 26° distance * Sun: 87° distance * rough path description: N Canada The occultation path -------------------- * approximate projected width [km]: 131 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .028", 0° ) * approx speed of asteroid's shadow [km/s]: 16.9624 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0818-00114-1 by 103 Hera on 2007 Nov 04 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 -159 0 0 .. .. .. .. .. .. .. .. .. .. .. .. 58 42 33 .. .. .. 59 46 34 -158 0 0 58 18 34 9 11 45 0 63 -45 .. .. .. 58 59 18 .. .. .. 60 3 11 -157 0 0 58 35 7 9 11 45 1 63 -45 57 55 2 59 15 45 .. .. .. 60 19 30 -156 0 0 58 51 23 9 11 45 1 64 -45 58 11 23 59 31 56 .. .. .. 60 35 31 -155 0 0 59 7 21 9 11 46 2 65 -45 58 27 27 59 47 48 .. .. .. 60 51 15 -154 0 0 59 23 2 9 11 46 3 66 -45 58 43 13 60 3 24 .. .. .. 61 6 41 -153 0 0 59 38 26 9 11 46 3 67 -45 58 58 43 60 18 42 .. .. .. 61 21 49 -152 0 0 59 53 32 9 11 46 4 68 -45 59 13 55 60 33 42 .. .. .. 61 36 40 -151 0 0 60 8 21 9 11 47 4 69 -45 59 28 49 60 48 24 .. .. .. 61 51 12 -150 0 0 60 22 52 9 11 47 5 69 -45 59 43 26 61 2 50 .. .. .. 62 5 28 -149 0 0 60 37 6 9 11 48 5 70 -44 59 57 46 61 16 57 .. .. .. 62 19 25 -148 0 0 60 51 3 9 11 48 6 71 -44 60 11 49 61 30 47 .. .. .. 62 33 5 -147 0 0 61 4 42 9 11 49 6 72 -44 60 25 34 61 44 20 .. .. .. 62 46 28 -146 0 0 61 18 3 9 11 49 7 73 -44 60 39 2 61 57 36 .. .. .. 62 59 33 -145 0 0 61 31 8 9 11 50 8 74 -44 60 52 13 62 10 34 59 53 13 63 12 20 -144 0 0 61 43 55 9 11 51 8 75 -44 61 5 6 62 23 15 60 6 15 63 24 51 -143 0 0 61 56 26 9 11 51 9 76 -43 61 17 43 62 35 39 60 19 1 63 37 4 -142 0 0 62 8 39 9 11 52 9 77 -43 61 30 2 62 47 45 60 31 30 63 49 0 -141 0 0 62 20 35 9 11 53 10 77 -43 61 42 5 62 59 35 60 43 41 64 0 40 -140 0 0 62 32 15 9 11 54 10 78 -43 61 53 50 63 11 8 60 55 36 64 12 2 -139 0 0 62 43 37 9 11 55 11 79 -43 62 5 19 63 22 24 61 7 14 64 23 8 -138 0 0 62 54 43 9 11 56 11 80 -42 62 16 31 63 33 24 61 18 35 64 33 57 -137 0 0 63 5 33 9 11 57 12 81 -42 62 27 27 63 44 7 61 29 40 64 44 30 -136 0 0 63 16 6 9 11 57 12 82 -42 62 38 6 63 54 34 61 40 28 64 54 47 -135 0 0 63 26 22 9 11 58 12 83 -42 62 48 29 64 4 44 61 51 0 65 4 47 -134 0 0 63 36 23 9 11 59 13 84 -41 62 58 35 64 14 38 62 1 15 65 14 31 -133 0 0 63 46 7 9 12 0 13 85 -41 63 8 26 64 24 16 62 11 14 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2 22 58 30 4 - 19 0 0 56 25 39 9 16 29 43 217 5 55 45 0 57 6 53 54 43 28 58 11 34 - 18 0 0 56 6 39 9 16 33 43 218 5 55 25 56 56 47 58 54 24 18 57 52 47 - 17 0 0 55 47 23 9 16 37 43 220 6 55 6 35 56 28 45 54 4 51 57 33 41 - 16 0 0 55 27 49 9 16 42 43 221 7 54 46 58 56 9 16 53 45 7 57 14 18 - 15 0 0 55 7 58 9 16 46 43 222 7 54 27 3 55 49 29 53 25 8 56 54 38 - 14 0 0 54 47 51 9 16 50 43 224 8 54 6 53 55 29 26 53 4 52 56 34 41 - 13 0 0 54 27 28 9 16 55 43 225 9 53 46 26 55 9 6 52 44 20 56 14 27 - 12 0 0 54 6 49 9 16 59 42 227 9 53 25 44 54 48 30 52 23 34 55 53 56 - 11 0 0 53 45 54 9 17 4 42 228 10 53 4 46 54 27 38 52 2 32 55 33 9 - 10 0 0 53 24 44 9 17 8 42 230 11 52 43 34 54 6 31 51 41 16 55 12 6 - 9 0 0 53 3 20 9 17 13 42 231 11 52 22 7 53 45 9 51 19 45 54 50 48 - 8 0 0 52 41 41 9 17 17 41 232 12 52 0 26 53 23 32 50 58 1 54 29 14 - 7 0 0 52 19 47 9 17 22 41 234 13 51 38 31 53 1 40 50 36 3 54 7 26 - 6 0 0 51 57 41 9 17 26 41 235 13 51 16 23 52 39 35 50 13 53 53 45 24 - 5 0 0 51 35 21 9 17 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45 40 57 9 18 39 34 255 25 44 59 52 46 22 38 43 57 42 47 28 3 11 0 0 45 16 32 9 18 43 33 256 25 44 35 30 45 58 9 43 33 24 47 3 29 12 0 0 44 52 5 9 18 47 33 257 26 44 11 6 45 33 39 43 9 5 46 38 53 13 0 0 44 27 36 9 18 51 32 258 27 43 46 42 45 9 7 42 44 46 46 14 15 14 0 0 44 3 8 9 18 55 31 260 27 43 22 17 44 44 34 42 20 27 45 49 37 15 0 0 43 38 40 9 19 0 31 261 28 42 57 53 44 20 3 41 56 9 45 24 58 16 0 0 43 14 14 9 19 4 30 262 29 42 33 31 43 55 32 41 31 53 45 0 20 17 0 0 42 49 50 9 19 8 29 262 29 42 9 11 43 31 3 41 7 40 44 35 44 18 0 0 42 25 29 9 19 12 29 263 30 41 44 55 43 6 37 40 43 30 44 11 10 19 0 0 42 1 11 9 19 15 28 264 31 41 20 42 42 42 15 40 19 24 43 46 40 20 0 0 41 36 58 9 19 19 27 265 31 40 56 34 42 17 57 39 55 23 43 22 13 21 0 0 41 12 51 9 19 23 26 266 32 40 32 31 41 53 44 39 31 28 42 57 52 22 0 0 40 48 49 9 19 27 26 267 33 40 8 35 41 29 37 39 7 40 42 33 36 23 0 0 40 24 55 9 19 30 25 268 33 39 44 46 41 5 37 38 43 59 42 9 27 24 0 0 40 1 8 9 19 34 24 269 34 39 21 5 40 41 44 38 20 25 41 45 25 25 0 0 39 37 29 9 19 37 23 270 34 38 57 32 40 18 0 37 57 1 41 21 31 26 0 0 39 14 0 9 19 40 23 270 35 38 34 9 39 54 25 37 33 46 40 57 46 27 0 0 38 50 41 9 19 43 22 271 35 38 10 55 39 30 59 37 10 41 40 34 11 28 0 0 38 27 33 9 19 46 21 272 36 37 47 53 39 7 45 36 47 47 40 10 47 29 0 0 38 4 35 9 19 49 20 273 36 37 25 1 38 44 41 36 25 5 39 47 33 30 0 0 37 41 50 9 19 52 19 273 37 37 2 22 38 21 50 36 2 35 39 24 31 31 0 0 37 19 18 9 19 55 19 274 37 36 39 56 37 59 11 35 40 17 39 1 43 32 0 0 36 56 59 9 19 58 18 275 38 36 17 44 37 36 46 35 18 14 38 39 7 33 0 0 36 34 55 9 20 0 17 276 38 35 55 45 37 14 35 34 56 25 38 16 45 34 0 0 36 13 5 9 20 2 16 276 39 35 34 2 36 52 39 34 34 50 37 54 39 35 0 0 35 51 30 9 20 5 15 277 39 35 12 34 36 30 58 34 13 31 37 32 47 36 0 0 35 30 12 9 20 7 14 278 39 34 51 21 36 9 33 33 52 28 37 11 12 37 0 0 35 9 10 9 20 9 13 278 40 34 30 26 35 48 25 33 31 42 36 49 53 38 0 0 34 48 26 9 20 11 13 279 40 34 9 48 35 27 33 33 11 13 36 28 51 39 0 0 34 27 59 9 20 13 12 279 40 33 49 27 35 7 0 32 51 2 36 8 7 40 0 0 34 7 50 9 20 14 11 280 41 33 29 25 34 46 45 32 31 9 35 47 42 41 0 0 33 48 1 9 20 16 10 281 41 33 9 41 34 26 49 32 11 34 35 27 35 42 0 0 33 28 31 9 20 17 9 281 41 32 50 17 34 7 13 31 52 19 35 7 48 43 0 0 33 9 20 9 20 19 8 282 41 32 31 13 33 47 56 31 33 24 34 48 21 44 0 0 32 50 30 9 20 20 7 282 41 32 12 29 33 28 59 .. .. .. 34 29 15 45 0 0 32 32 1 9 20 21 6 283 41 31 54 6 33 10 24 .. .. .. 34 10 29 46 0 0 32 13 53 9 20 22 6 283 42 31 36 4 32 52 10 .. .. .. 33 52 5 47 0 0 31 56 6 9 20 23 5 284 42 31 18 23 32 34 17 .. .. .. 33 34 3 48 0 0 31 38 42 9 20 23 4 285 42 31 1 5 32 16 47 .. .. .. 33 16 22 49 0 0 31 21 40 9 20 24 3 285 42 30 44 9 31 59 39 .. .. .. 32 59 5 50 0 0 31 5 1 9 20 24 2 286 42 .. .. .. 31 42 54 .. .. .. 32 42 11 51 0 0 30 48 45 9 20 24 1 286 42 .. .. .. 31 26 32 .. .. .. 32 25 40 52 0 0 30 32 53 9 20 24 0 287 42 .. .. .. 31 10 34 .. .. .. 32 9 33 Data for the target star ------------------------ * name: TYC 0818-00114-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 07 01.4090 DE: +14 22 39.641 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .034 ) * V mag [mag]: 11.7 * B mag [mag]: 13.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (103) Hera approx. diameter [km]: 91 approx. diameter ["]: .045 distance from Earth [AU]: 2.76600 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 597 number of rejected observations: 207 time covered by the observations: 1908 Oct 15 - 2007 Sep 10 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.007, 101° remarks: * orbital elements for (103) Hera : Mean anomaly = 143.19128228 deg Arg. of pericenter = 190.19722402 deg Long. of node = 136.26860725 deg Inclination = 5.42147088 deg Eccentricity = 0.07977095 Semimajor axis = 2.70273633 AU Perihelion dist = 2.48713648 AU Mag: H = 7.42, G = 0.15 Epoch of elements : MJD 54408.38600000 TDT (2007 Nov 04.386) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 04 103 Hera 9h 16.1m UT 11.7 9 7 1.409 14 22 39.64TYC 0818-00114-1 13.0 13.2 91 5.4 2.766 2.025 -7.76 -45.506 14.380 36.88 -15.30 9.2680 .18520 .69713 9.25716 -2.44284 -0.00563 0.00169 2000 141.33110820071027.00000190.197224136.268607 5.4214710.079770952.702736332.487136487.665 0.15 RATE 2.2181890 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.035 0.028 0.4 1.770 0.035 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org