IOTA/IOTA-ES occultation update for (449) Hamburga / 2UCAC 22098812 event on 2008 Jul 04, 07:29 UT Visible from USA, Mexico Summary ------- On 2008 Jul 04 UT, the 86 km diameter asteroid (449) Hamburga will occult a 13.0 mag star in the constellation Sagittarius for observers along a path across USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 13.3 mag (the magnitude of the asteroid) for at most 6.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 90 * date and approx. time of event: 2008 Jul 04, 07:24 - 2008 Jul 04, 07:35 UT * magnitude of target star: 13.0 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 6.5 * Moon: 2 % sunlit, 164° distance * Sun: 178° distance * rough path description: USA, Mexico The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .033", 88° ) * approx speed of asteroid's shadow [km/s]: 13.2539 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 22098812 by 449 Hamburga on 2008 Jul 4 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 177 0 0 34 55 50 7 35 22 0 120 -2 .. .. .. 34 15 18 .. .. .. .. .. .. 178 0 0 34 27 41 7 35 22 1 121 -3 35 8 37 33 47 22 35 52 44 .. .. .. 179 0 0 33 59 58 7 35 22 2 121 -4 34 40 42 33 19 52 35 24 34 .. .. .. 180 0 0 33 32 43 7 35 21 3 122 -5 34 13 13 32 52 48 34 56 52 .. .. .. -179 0 0 33 5 55 7 35 20 4 122 -6 33 46 13 32 26 12 34 29 37 31 44 44 -178 0 0 32 39 35 7 35 20 5 123 -7 33 19 41 32 0 5 34 2 51 31 18 48 -177 0 0 32 13 44 7 35 18 6 123 -8 32 53 38 31 34 25 33 36 35 30 53 21 -176 0 0 31 48 23 7 35 17 7 124 -9 32 28 5 31 9 15 33 10 48 30 28 22 -175 0 0 31 23 32 7 35 16 8 124 -10 32 3 2 30 44 35 32 45 32 30 3 54 -174 0 0 30 59 11 7 35 14 9 125 -10 31 38 29 30 20 25 32 20 47 29 39 55 -173 0 0 30 35 21 7 35 12 10 125 -11 31 14 28 29 56 46 31 56 33 29 16 27 -172 0 0 30 12 2 7 35 10 11 126 -12 30 50 58 29 33 38 31 32 52 28 53 30 -171 0 0 29 49 16 7 35 8 11 127 -13 30 28 1 29 11 2 31 9 42 28 31 4 -170 0 0 29 27 1 7 35 5 12 127 -14 30 5 36 28 48 58 30 47 6 28 9 10 -169 0 0 29 5 19 7 35 3 13 128 -15 29 43 44 28 27 26 30 25 2 27 47 48 -168 0 0 28 44 11 7 35 0 14 128 -16 29 22 25 28 6 27 30 3 32 27 26 59 -167 0 0 28 23 35 7 34 57 15 129 -17 29 1 39 27 46 0 29 42 36 27 6 42 -166 0 0 28 3 33 7 34 54 16 129 -18 28 41 28 27 26 8 29 22 13 26 46 59 -165 0 0 27 44 4 7 34 50 17 130 -19 28 21 50 27 6 48 29 2 26 26 27 48 -164 0 0 27 25 10 7 34 47 18 130 -19 28 2 47 26 48 3 28 43 13 26 9 11 -163 0 0 27 6 50 7 34 43 19 131 -20 27 44 18 26 29 51 28 24 34 25 51 8 -162 0 0 26 49 5 7 34 40 19 131 -21 27 26 24 26 12 14 28 6 31 25 33 39 -161 0 0 26 31 54 7 34 36 20 132 -22 27 9 6 25 55 11 27 49 3 25 16 45 -160 0 0 26 15 18 7 34 32 21 133 -23 26 52 22 25 38 43 27 32 11 25 0 24 -159 0 0 25 59 17 7 34 27 22 133 -24 26 36 13 25 22 49 27 15 54 24 44 38 -158 0 0 25 43 52 7 34 23 23 134 -24 26 20 40 25 7 30 27 0 13 24 29 27 -157 0 0 25 29 1 7 34 18 24 134 -25 26 5 43 24 52 47 26 45 7 24 14 50 -156 0 0 25 14 46 7 34 14 24 135 -26 25 51 21 24 38 39 26 30 38 24 0 48 -155 0 0 25 1 7 7 34 9 25 136 -27 25 37 35 24 25 5 26 16 45 23 47 22 -154 0 0 24 48 3 7 34 4 26 136 -28 25 24 25 24 12 8 26 3 28 23 34 30 -153 0 0 24 35 35 7 33 59 27 137 -28 25 11 51 23 59 45 25 50 48 23 22 14 -152 0 0 24 23 43 7 33 53 27 138 -29 24 59 54 23 47 59 25 38 44 23 10 33 -151 0 0 24 12 27 7 33 48 28 138 -30 24 48 32 23 36 48 25 27 16 22 59 27 -150 0 0 24 1 46 7 33 43 29 139 -31 24 37 46 23 26 12 25 16 25 22 48 56 -149 0 0 23 51 42 7 33 37 30 140 -31 24 27 37 23 16 12 25 6 11 22 39 1 -148 0 0 23 42 14 7 33 31 30 140 -32 24 18 4 23 6 48 24 56 33 22 29 42 -147 0 0 23 33 21 7 33 25 31 141 -33 24 9 8 22 58 0 24 47 31 22 20 58 -146 0 0 23 25 5 7 33 20 32 142 -33 24 0 47 22 49 48 24 39 7 22 12 49 -145 0 0 23 17 25 7 33 14 32 143 -34 23 53 3 22 42 11 24 31 19 22 5 16 -144 0 0 23 10 21 7 33 7 33 144 -35 23 45 56 22 35 10 24 24 7 21 58 19 -143 0 0 23 3 53 7 33 1 34 144 -35 23 39 25 22 28 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49 42 21 25 7 -128 0 0 22 39 7 7 31 18 40 159 -42 23 14 25 22 4 13 23 52 17 21 27 39 -127 0 0 22 42 16 7 31 11 41 160 -42 23 17 35 22 7 21 23 55 29 21 30 45 -126 0 0 22 46 0 7 31 3 41 161 -42 23 21 21 22 11 4 23 59 16 21 34 27 -125 0 0 22 50 21 7 30 56 41 162 -43 23 25 43 22 15 23 24 3 41 21 38 44 -124 0 0 22 55 17 7 30 49 41 163 -43 23 30 42 22 20 17 24 8 41 21 43 36 -123 0 0 23 0 49 7 30 41 41 164 -43 23 36 16 22 25 47 24 14 18 21 49 3 -122 0 0 23 6 56 7 30 34 42 166 -43 23 42 26 22 31 52 24 20 31 21 55 6 -121 0 0 23 13 40 7 30 26 42 167 -43 23 49 12 22 38 32 24 27 20 22 1 43 -120 0 0 23 20 58 7 30 19 42 168 -43 23 56 33 22 45 47 24 34 45 22 8 56 -119 0 0 23 28 52 7 30 11 42 169 -43 24 4 31 22 53 38 24 42 46 22 16 43 -118 0 0 23 37 21 7 30 4 42 170 -43 24 13 4 23 2 4 24 51 23 22 25 5 -117 0 0 23 46 26 7 29 56 42 172 -43 24 22 12 23 11 5 25 0 36 22 34 2 -116 0 0 23 56 6 7 29 48 42 173 -43 24 31 56 23 20 40 25 10 25 22 43 34 -115 0 0 24 6 21 7 29 41 42 174 -43 24 42 16 23 30 51 25 20 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45 31 19 54 - 86 0 0 33 5 54 7 26 21 29 204 -30 33 45 54 32 26 30 34 28 58 31 45 19 - 85 0 0 33 32 10 7 26 16 28 205 -29 34 12 21 32 52 34 34 55 39 32 11 12 - 84 0 0 33 58 51 7 26 10 27 206 -28 34 39 15 33 19 3 35 22 46 32 37 30 - 83 0 0 34 25 58 7 26 5 27 207 -27 35 6 34 33 45 58 35 50 18 33 4 13 - 82 0 0 34 53 30 7 26 0 26 208 -26 35 34 18 34 13 18 36 18 16 33 31 20 - 81 0 0 35 21 25 7 25 55 25 208 -26 36 2 27 34 41 2 36 46 39 33 58 52 - 80 0 0 35 49 45 7 25 50 24 209 -25 36 30 59 35 9 9 37 15 25 34 26 47 - 79 0 0 36 18 27 7 25 45 23 210 -24 36 59 53 35 37 39 37 44 34 34 55 4 - 78 0 0 36 47 30 7 25 41 23 211 -23 37 29 10 36 6 30 38 14 5 35 23 43 - 77 0 0 37 16 55 7 25 36 22 211 -22 37 58 48 36 35 43 38 43 58 35 52 43 - 76 0 0 37 46 40 7 25 32 21 212 -21 38 28 46 37 5 15 39 14 11 36 22 3 - 75 0 0 38 16 45 7 25 28 20 213 -21 38 59 4 37 35 7 39 44 43 36 51 42 - 74 0 0 38 47 7 7 25 24 19 214 -20 39 29 40 38 5 17 40 15 34 37 21 40 - 73 0 0 39 17 48 7 25 20 18 214 -19 40 0 33 38 35 45 40 46 42 37 51 54 - 72 0 0 39 48 44 7 25 17 17 215 -18 40 31 43 39 6 29 41 18 6 38 22 26 - 71 0 0 40 19 56 7 25 13 17 216 -17 41 3 8 39 37 28 41 49 46 38 53 13 - 70 0 0 40 51 22 7 25 10 16 217 -16 41 34 47 40 8 42 42 21 40 39 24 14 - 69 0 0 41 23 2 7 25 7 15 217 -15 42 6 40 40 40 9 42 53 47 39 55 29 - 68 0 0 41 54 54 7 25 4 14 218 -15 42 38 45 41 11 49 43 26 7 40 26 56 - 67 0 0 42 26 56 7 25 2 13 219 -14 43 11 0 41 43 39 43 58 36 40 58 34 - 66 0 0 42 59 9 7 24 59 12 220 -13 43 43 25 42 15 40 44 31 16 41 30 22 - 65 0 0 43 31 30 7 24 57 11 220 -12 44 15 59 42 47 49 45 4 3 42 2 20 - 64 0 0 44 3 58 7 24 55 11 221 -11 44 48 40 43 20 6 45 36 58 42 34 25 - 63 0 0 44 36 33 7 24 53 10 222 -10 45 21 26 43 52 29 46 9 58 43 6 36 - 62 0 0 45 9 12 7 24 51 9 222 -9 45 54 17 44 24 57 46 43 3 43 38 53 - 61 0 0 45 41 55 7 24 49 8 223 -8 46 27 12 44 57 29 47 16 10 44 11 14 - 60 0 0 46 14 41 7 24 48 7 224 -8 47 0 8 45 30 4 47 49 19 44 43 39 - 59 0 0 46 47 27 7 24 47 6 225 -7 47 33 5 46 2 40 48 22 28 45 16 4 - 58 0 0 47 20 13 7 24 46 5 225 -6 48 6 2 46 35 16 48 55 36 45 48 30 - 57 0 0 47 52 57 7 24 45 4 226 -5 48 38 56 47 7 51 49 28 42 46 20 56 - 56 0 0 48 25 38 7 24 44 4 227 -4 49 11 47 47 40 23 50 1 43 46 53 19 - 55 0 0 48 58 15 7 24 44 3 228 -3 49 44 33 48 12 51 50 34 40 47 25 38 - 54 0 0 49 30 46 7 24 43 2 228 -2 50 17 13 48 45 14 51 7 29 .. .. .. - 53 0 0 50 3 10 7 24 43 1 229 -2 50 49 45 49 17 31 .. .. .. .. .. .. - 52 0 0 50 35 26 7 24 43 0 230 -1 .. .. .. 49 49 39 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: 2UCAC 22098812 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 59 36.8110 DE: -24 08 40.359 * position source: Pos: TMO, pm: , pi: * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (449) Hamburga approx. diameter [km]: 86 approx. diameter ["]: .063 distance from Earth [AU]: 1.89700 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 905 number of rejected observations: 92 time covered by the observations: 1901 Mar 17 - 2008 Jun 17 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.022, 86° remarks: * orbital elements for (449) Hamburga : Mean anomaly = 139.57950307 deg Arg. of pericenter = 46.79492650 deg Long. of node = 86.03674562 deg Inclination = 3.08856326 deg Eccentricity = 0.17077410 Semimajor axis = 2.55508895 AU Perihelion dist = 2.11874593 AU Mag: H = 9.79, G = 0.15 Epoch of elements : MJD 54651.31200000 TDT (2008 Jul 04.312) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 4 449 Hamburga 7h 30.0m UT 13.0 18 59 36.811-24 8 40.362UCAC 22098812 0.0 13.3 86 6.5 1.897 -2.500 -5.69 -110.2903 -24.142 68.61 22.83 7.5006 -0.12232 0.73519 -7.37940 -1.22793 -0.00010 0.00013 2000 139.2628902008 7 3.00000 46.794926 86.036746 3.0885630.17077410 2.5550890 2.1187459 9.5 5.00.15 RATE 2.4132090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.033 88 1.53 0.033 0 54636.5020080704_098812 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org