IOTA/IOTA-ES occultation update for (6) Hebe / UCAC2 39313876 event on 2008 Apr 02, 12:10 UT Visible from Philippines, Indonesia Summary ------- On 2008 Apr 02 UT, the 185 km diameter asteroid (6) Hebe will occult a 11.9 mag star in the constellation Cancer for observers along a path across Philippines, Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 10.3 mag (the magnitude of the asteroid) for at most 47.5 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: 99 * date and approx. time of event: 2008 Apr 02, 11:51 - 2008 Apr 02, 12:37 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 47.5 * Moon: 17 % sunlit, 164° distance * Sun: 117° distance * rough path description: Philippines, Indonesia Additional comments ------------------- very low mag drop The occultation path -------------------- * approximate projected width [km]: 187 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .023", 87° ) * approx speed of asteroid's shadow [km/s]: 3.8996 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39313876 by 6 Hebe on 2008 Apr 2 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 Latitude Latitude Latitude Latitude 92 0 0 -14 28 21 11 51 2 42 42 0 -15 36 29 -13 20 23 -16 2 25 -12 54 36 93 0 0 -13 35 12 11 51 29 44 42 -1 -14 43 29 -12 27 4 -15 9 29 -12 1 13 94 0 0 -12 41 36 11 51 58 45 41 -2 -13 50 2 -11 33 20 -14 16 5 -11 7 26 95 0 0 -11 47 36 11 52 27 47 41 -3 -12 56 9 -10 39 13 -13 22 15 -10 13 16 96 0 0 -10 53 15 11 52 57 48 40 -4 -12 1 55 - 9 44 46 -12 28 3 - 9 18 47 97 0 0 - 9 58 37 11 53 28 49 40 -5 -11 7 21 - 8 50 3 -11 33 31 - 8 24 3 98 0 0 - 9 3 43 11 54 0 51 39 -6 -10 12 31 - 7 55 7 -10 38 42 - 7 29 5 99 0 0 - 8 8 39 11 54 33 52 39 -7 - 9 17 28 - 7 0 1 - 9 43 40 - 6 33 59 100 0 0 - 7 13 26 11 55 7 54 38 -8 - 8 22 16 - 6 4 48 - 8 48 28 - 5 38 46 101 0 0 - 6 18 10 11 55 41 55 38 -10 - 7 26 58 - 5 9 33 - 7 53 10 - 4 43 32 102 0 0 - 5 22 52 11 56 16 56 37 -11 - 6 31 38 - 4 14 19 - 6 57 49 - 3 48 19 103 0 0 - 4 27 38 11 56 52 58 36 -12 - 5 36 19 - 3 19 9 - 6 2 29 - 2 53 11 104 0 0 - 3 32 30 11 57 28 59 36 -13 - 4 41 6 - 2 24 7 - 5 7 14 - 1 58 12 105 0 0 - 2 37 33 11 58 5 61 35 -14 - 3 46 1 - 1 29 18 - 4 12 6 - 1 3 25 106 0 0 - 1 42 49 11 58 42 62 34 -15 - 2 51 9 - 0 34 43 - 3 17 10 - 0 8 54 107 0 0 - 0 48 23 11 59 20 63 33 -16 - 1 56 32 0 19 33 - 2 22 30 0 45 18 108 0 0 0 5 42 11 59 58 65 32 -17 - 1 2 15 1 13 26 - 1 28 9 1 39 7 109 0 0 0 59 23 12 0 36 66 31 -18 - 0 8 21 2 6 53 - 0 34 10 2 32 29 110 0 0 1 52 36 12 1 15 68 30 -19 0 45 6 2 59 52 0 19 23 3 25 22 111 0 0 2 45 19 12 1 54 69 28 -20 1 38 4 3 52 18 1 12 27 4 17 42 112 0 0 3 37 27 12 2 33 70 27 -21 2 30 29 4 44 10 2 4 58 5 9 27 113 0 0 4 28 59 12 3 13 71 25 -22 3 22 19 5 35 23 2 56 55 6 0 33 114 0 0 5 19 51 12 3 52 73 23 -23 4 13 30 6 25 56 3 48 13 6 50 59 115 0 0 6 10 1 12 4 32 74 20 -24 5 4 0 7 15 46 4 38 50 7 40 41 116 0 0 6 59 26 12 5 11 75 17 -25 5 53 46 8 4 51 5 28 44 8 29 38 117 0 0 7 48 5 12 5 51 76 14 -26 6 42 47 8 53 8 6 17 53 9 17 47 118 0 0 8 35 55 12 6 30 77 10 -27 7 30 59 9 40 36 7 6 14 10 5 6 119 0 0 9 22 55 12 7 9 78 5 -28 8 18 22 10 27 13 7 53 45 10 51 35 120 0 0 10 9 3 12 7 49 79 0 -29 9 4 53 11 12 57 8 40 25 11 37 10 121 0 0 10 54 17 12 8 27 80 354 -30 9 50 31 11 57 48 9 26 13 12 21 52 122 0 0 11 38 37 12 9 6 80 347 -31 10 35 15 12 41 44 10 11 5 13 5 39 123 0 0 12 22 1 12 9 44 80 340 -32 11 19 3 13 24 43 10 55 3 13 48 29 124 0 0 13 4 28 12 10 22 81 332 -33 12 1 54 14 6 46 11 38 4 14 30 22 125 0 0 13 45 58 12 11 0 81 325 -34 12 43 49 14 47 51 12 20 7 15 11 18 126 0 0 14 26 29 12 11 37 80 317 -35 13 24 45 15 27 58 13 1 13 15 51 16 127 0 0 15 6 2 12 12 14 80 310 -36 14 4 43 16 7 7 13 41 20 16 30 16 128 0 0 15 44 36 12 12 51 80 304 -37 14 43 41 16 45 17 14 20 28 17 8 16 129 0 0 16 22 12 12 13 27 79 298 -37 15 21 41 17 22 28 14 58 37 17 45 18 130 0 0 16 58 47 12 14 2 78 293 -38 15 58 41 17 58 40 15 35 46 18 21 21 131 0 0 17 34 24 12 14 37 77 289 -39 16 34 41 18 33 53 16 11 56 18 56 25 132 0 0 18 9 2 12 15 12 77 286 -40 17 9 43 19 8 7 16 47 6 19 30 31 133 0 0 18 42 41 12 15 46 76 283 -41 17 43 45 19 41 23 17 21 17 20 3 38 134 0 0 19 15 21 12 16 20 75 280 -41 18 16 48 20 13 40 17 54 29 20 35 47 135 0 0 19 47 3 12 16 53 74 278 -42 18 48 52 20 45 0 18 26 41 21 6 58 136 0 0 20 17 47 12 17 26 73 277 -43 19 19 58 21 15 22 18 57 56 21 37 12 137 0 0 20 47 33 12 17 59 72 275 -43 19 50 6 21 44 48 19 28 12 22 6 29 138 0 0 21 16 23 12 18 30 71 274 -44 20 19 16 22 13 16 19 57 30 22 34 50 139 0 0 21 44 16 12 19 2 70 273 -45 20 47 30 22 40 49 20 25 52 23 2 15 140 0 0 22 11 13 12 19 32 69 272 -45 21 14 47 23 7 26 20 53 16 23 28 45 141 0 0 22 37 14 12 20 3 68 271 -46 21 41 8 23 33 9 21 19 45 23 54 20 142 0 0 23 2 21 12 20 32 67 271 -47 22 6 33 23 57 57 21 45 18 24 19 1 143 0 0 23 26 34 12 21 2 66 270 -47 22 31 4 24 21 51 22 9 56 24 42 49 144 0 0 23 49 53 12 21 30 65 270 -48 22 54 41 24 44 53 22 33 40 25 5 44 145 0 0 24 12 19 12 21 59 63 269 -48 23 17 25 25 7 2 22 56 29 25 27 47 146 0 0 24 33 53 12 22 26 62 269 -49 23 39 15 25 28 20 23 18 26 25 48 59 147 0 0 24 54 35 12 22 54 61 269 -49 24 0 13 25 48 47 23 39 31 26 9 19 148 0 0 25 14 27 12 23 20 60 269 -50 24 20 20 26 8 23 23 59 43 26 28 50 149 0 0 25 33 28 12 23 47 59 269 -50 24 39 36 26 27 9 24 19 5 26 47 30 150 0 0 25 51 39 12 24 13 58 269 -51 24 58 1 26 45 6 24 37 35 27 5 22 151 0 0 26 9 1 12 24 38 57 269 -51 25 15 37 27 2 15 24 55 16 27 22 26 152 0 0 26 25 34 12 25 3 56 269 -52 25 32 23 27 18 35 25 12 8 27 38 42 153 0 0 26 41 20 12 25 27 55 269 -52 25 48 21 27 34 9 25 28 10 27 54 10 154 0 0 26 56 18 12 25 51 54 269 -52 26 3 31 27 48 55 25 43 25 28 8 52 155 0 0 27 10 29 12 26 15 53 270 -53 26 17 54 28 2 55 25 57 52 28 22 49 156 0 0 27 23 54 12 26 38 53 270 -53 26 31 29 28 16 10 26 11 32 28 35 59 157 0 0 27 36 34 12 27 1 52 270 -53 26 44 19 28 28 39 26 24 25 28 48 25 158 0 0 27 48 28 12 27 23 51 270 -54 26 56 22 28 40 24 26 36 32 29 0 6 159 0 0 27 59 37 12 27 45 50 271 -54 27 7 41 28 51 24 26 47 54 29 11 3 160 0 0 28 10 2 12 28 6 49 271 -54 27 18 14 29 1 41 26 58 30 29 21 17 161 0 0 28 19 43 12 28 27 48 271 -54 27 28 3 29 11 15 27 8 22 29 30 48 162 0 0 28 28 41 12 28 47 47 271 -55 27 37 8 29 20 6 27 17 30 29 39 36 163 0 0 28 36 56 12 29 8 46 272 -55 27 45 30 29 28 14 27 25 55 29 47 41 164 0 0 28 44 29 12 29 27 45 272 -55 27 53 8 29 35 40 27 33 36 29 55 6 165 0 0 28 51 19 12 29 47 44 273 -55 28 0 4 29 42 25 27 40 34 30 1 48 166 0 0 28 57 27 12 30 5 43 273 -55 28 6 18 29 48 28 27 46 49 30 7 50 167 0 0 29 2 54 12 30 24 42 273 -55 28 11 49 29 53 51 27 52 23 30 13 10 168 0 0 29 7 40 12 30 42 41 274 -55 28 16 39 29 58 33 27 57 14 30 17 51 169 0 0 29 11 45 12 31 0 40 274 -55 28 20 48 30 2 34 28 1 24 30 21 51 170 0 0 29 15 9 12 31 17 39 275 -56 28 24 15 30 5 56 28 4 53 30 25 11 171 0 0 29 17 54 12 31 34 38 275 -56 28 27 2 30 8 37 28 7 40 30 27 52 172 0 0 29 19 58 12 31 51 37 275 -56 28 29 8 30 10 39 28 9 47 30 29 53 173 0 0 29 21 22 12 32 7 36 276 -56 28 30 34 30 12 2 28 11 14 30 31 16 174 0 0 29 22 7 12 32 23 36 276 -56 28 31 20 30 12 46 28 12 0 30 31 59 175 0 0 29 22 12 12 32 38 35 277 -55 28 31 26 30 12 51 28 12 6 30 32 4 176 0 0 29 21 38 12 32 53 34 277 -55 28 30 52 30 12 17 28 11 32 30 31 29 177 0 0 29 20 25 12 33 8 33 278 -55 28 29 39 30 11 4 28 10 19 30 30 17 178 0 0 29 18 33 12 33 22 32 278 -55 28 27 46 30 9 13 28 8 26 30 28 26 179 0 0 29 16 2 12 33 36 31 279 -55 28 25 14 30 6 43 28 5 53 30 25 57 180 0 0 29 12 53 12 33 49 30 279 -55 28 22 3 30 3 36 28 2 42 30 22 50 -179 0 0 29 9 5 12 34 3 29 279 -55 28 18 13 29 59 50 27 58 51 30 19 5 -178 0 0 29 4 39 12 34 15 28 280 -55 28 13 44 29 55 26 27 54 21 30 14 43 -177 0 0 28 59 34 12 34 28 27 280 -54 28 8 36 29 50 24 27 49 12 30 9 42 -176 0 0 28 53 51 12 34 40 26 281 -54 28 2 49 29 44 45 27 43 24 30 4 3 -175 0 0 28 47 29 12 34 52 25 281 -54 27 56 24 29 38 27 27 36 57 29 57 47 -174 0 0 28 40 29 12 35 3 24 282 -54 27 49 20 29 31 32 27 29 52 29 50 53 -173 0 0 28 32 51 12 35 14 24 282 -53 27 41 37 29 23 58 27 22 7 29 43 22 -172 0 0 28 24 35 12 35 24 23 283 -53 27 33 16 29 15 47 27 13 44 29 35 13 -171 0 0 28 15 41 12 35 35 22 283 -53 27 24 16 29 6 58 27 4 42 29 26 26 -170 0 0 28 6 8 12 35 44 21 284 -53 27 14 38 28 57 31 26 55 2 29 17 1 -169 0 0 27 55 57 12 35 54 20 284 -52 27 4 21 28 47 27 26 44 42 29 6 59 -168 0 0 27 45 9 12 36 3 19 285 -52 26 53 26 28 36 45 26 33 44 28 56 19 -167 0 0 27 33 41 12 36 11 18 285 -51 26 41 52 28 25 24 26 22 8 28 45 2 -166 0 0 27 21 36 12 36 19 17 285 -51 26 29 39 28 13 26 26 9 52 28 33 6 -165 0 0 27 8 52 12 36 27 16 286 -51 26 16 48 28 0 50 25 56 58 28 20 33 -164 0 0 26 55 30 12 36 35 15 286 -50 26 3 18 27 47 36 25 43 25 28 7 22 -163 0 0 26 41 30 12 36 42 14 287 -50 25 49 9 27 33 44 25 29 14 27 53 33 -162 0 0 26 26 51 12 36 48 13 287 -49 25 34 22 27 19 14 25 14 23 27 39 6 -161 0 0 26 11 34 12 36 54 12 288 -49 25 18 56 27 4 6 24 58 54 27 24 2 -160 0 0 25 55 39 12 37 0 11 288 -49 25 2 51 26 48 19 24 42 46 27 8 19 -159 0 0 25 39 5 12 37 5 10 289 -48 24 46 8 26 31 55 24 25 59 26 51 58 -158 0 0 25 21 53 12 37 10 9 289 -48 24 28 46 26 14 52 24 8 33 26 34 59 -157 0 0 25 4 2 12 37 14 8 289 -47 24 10 45 25 57 11 23 50 29 26 17 22 -156 0 0 24 45 32 12 37 18 7 290 -47 23 52 6 25 38 52 23 31 45 25 59 7 -155 0 0 24 26 25 12 37 22 7 290 -46 23 32 47 25 19 55 23 12 23 25 40 13 -154 0 0 24 6 38 12 37 25 6 291 -45 23 12 51 25 0 19 22 52 22 25 20 42 -153 0 0 23 46 14 12 37 27 5 291 -45 22 52 15 24 40 6 22 31 42 25 0 32 -152 0 0 23 25 11 12 37 29 4 292 -44 22 31 1 24 19 14 22 10 24 24 39 44 -151 0 0 23 3 29 12 37 31 3 292 -44 22 9 8 23 57 44 21 48 27 24 18 19 -150 0 0 22 41 9 12 37 32 2 292 -43 21 46 37 23 35 35 21 25 51 23 56 15 -149 0 0 22 18 11 12 37 33 1 293 -43 21 23 27 23 12 49 21 2 37 23 33 33 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: UCAC2 39313876 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 52 16.7161 DE: +21 12 32.457 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6) Hebe approx. diameter [km]: 185 approx. diameter ["]: .123 distance from Earth [AU]: 2.08200 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 4797 number of rejected observations: 362 time covered by the observations: 1900 Jun 11 - 2008 Mar 15 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.010, 71° remarks: * orbital elements for (6) Hebe : Mean anomaly = 111.94761853 deg Arg. of pericenter = 239.52465962 deg Long. of node = 138.73686618 deg Inclination = 14.75315660 deg Eccentricity = 0.20198307 Semimajor axis = 2.42532076 AU Perihelion dist = 1.93544702 AU Mag: H = 5.70, G = 0.24 Epoch of elements : MJD 54558.50700000 TDT (2008 Apr 02.507) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 2 6 Hebe 12h 10.7m UT 11.9 8 52 16.716 21 12 32.46UCAC2 39313876 0.0 10.3 185 47.5 2.082 0.559 5.05 119.1945 21.207 -1.79 5.19 12.1776 0.08707 -0.13557 1.84691 1.19733 0.00488 -0.00155 2000 109.7277532008 325.00000239.524660138.736866 14.7531570.20198307 2.4253208 1.9354470 5.7 5.00.24 RATE 2.6094580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.023 87 1.19 0.023 0 54553.5020080402_313876 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org