IOTA/IOTA-ES occultation update for (148) Gallia / 2UCAC 34862381 event on 2008 Jul 06, 07:15 UT Visible from SE USA, Mexico Summary ------- On 2008 Jul 06 UT, the 98 km diameter asteroid (148) Gallia will occult a 13.3 mag star in the constellation Ophiuchus for observers along a path across SE USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.6 mag (the magnitude of the asteroid) for at most 7.1 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: 78 * date and approx. time of event: 2008 Jul 06, 07:07 - 2008 Jul 06, 07:23 UT * magnitude of target star: 13.3 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 7.1 * Moon: 13 % sunlit, 105° distance * Sun: 138° distance * rough path description: SE USA, Mexico The occultation path -------------------- * approximate projected width [km]: 99 * 1 sigma uncertainty interval [path widths]: +/- 0.71 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .042", 91° ) * approx speed of asteroid's shadow [km/s]: 13.8038 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 34862381 by 148 Gallia on 2008 Jul 6 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 140 41 45 -41 0 0 7 23 6 1 78 -1 ... .. .. 143 18 28 ... .. .. 146 36 41 146 3 7 -40 0 0 7 23 4 5 74 -4 143 45 19 148 10 42 140 5 20 150 58 24 Latitude Latitude Latitude Latitude 147 0 0 -39 47 53 7 23 3 6 74 -5 -39 20 10 -40 15 37 -38 40 52 -40 55 3 148 0 0 -39 34 36 7 23 2 7 73 -5 -39 6 49 -40 2 25 -38 27 24 -40 41 57 149 0 0 -39 20 48 7 23 2 8 72 -6 -38 52 56 -39 48 42 -38 13 25 -40 28 21 150 0 0 -39 6 30 7 23 1 9 72 -6 -38 38 33 -39 34 28 -37 58 55 -40 14 14 151 0 0 -38 51 40 7 23 0 9 71 -7 -38 23 38 -39 19 43 -37 43 53 -39 59 36 152 0 0 -38 36 18 7 22 58 10 70 -8 -38 8 12 -39 4 27 -37 28 19 -39 44 27 153 0 0 -38 20 25 7 22 57 11 70 -8 -37 52 14 -38 48 39 -37 12 14 -39 28 47 154 0 0 -38 4 1 7 22 56 12 69 -9 -37 35 44 -38 32 20 -36 55 36 -39 12 35 155 0 0 -37 47 4 7 22 54 13 69 -9 -37 18 41 -38 15 28 -36 38 26 -38 55 52 156 0 0 -37 29 35 7 22 53 14 68 -10 -37 1 7 -37 58 5 -36 20 44 -38 38 36 157 0 0 -37 11 34 7 22 51 14 67 -11 -36 43 0 -37 40 9 -36 2 29 -38 20 49 158 0 0 -36 53 0 7 22 49 15 67 -11 -36 24 20 -37 21 41 -35 43 41 -38 2 29 159 0 0 -36 33 53 7 22 48 16 66 -12 -36 5 7 -37 2 40 -35 24 20 -37 43 36 160 0 0 -36 14 13 7 22 46 17 66 -13 -35 45 22 -36 43 6 -35 4 26 -37 24 11 161 0 0 -35 54 0 7 22 44 18 65 -13 -35 25 3 -36 22 59 -34 43 59 -37 4 12 162 0 0 -35 33 14 7 22 41 19 64 -14 -35 4 10 -36 2 19 -34 22 58 -36 43 41 163 0 0 -35 11 54 7 22 39 20 64 -15 -34 42 44 -35 41 5 -34 1 23 -36 22 36 164 0 0 -34 50 0 7 22 37 20 63 -15 -34 20 45 -35 19 18 -33 39 14 -36 0 58 165 0 0 -34 27 33 7 22 34 21 63 -16 -33 58 11 -34 56 57 -33 16 32 -35 38 46 166 0 0 -34 4 32 7 22 31 22 62 -17 -33 35 4 -34 34 2 -32 53 16 -35 16 0 167 0 0 -33 40 57 7 22 28 23 62 -17 -33 11 22 -34 10 34 -32 29 25 -34 52 41 168 0 0 -33 16 48 7 22 25 24 61 -18 -32 47 7 -33 46 31 -32 5 1 -34 28 47 169 0 0 -32 52 4 7 22 22 25 60 -19 -32 22 17 -33 21 54 -31 40 2 -34 4 19 170 0 0 -32 26 47 7 22 19 26 60 -19 -31 56 53 -32 56 43 -31 14 29 -33 39 18 171 0 0 -32 0 55 7 22 16 27 59 -20 -31 30 55 -32 30 58 -30 48 21 -33 13 42 172 0 0 -31 34 29 7 22 12 28 59 -21 -31 4 22 -32 4 39 -30 21 40 -32 47 32 173 0 0 -31 7 29 7 22 8 29 58 -22 -30 37 16 -31 37 45 -29 54 24 -32 20 48 174 0 0 -30 39 55 7 22 5 30 58 -22 -30 9 35 -31 10 18 -29 26 35 -31 53 29 175 0 0 -30 11 47 7 22 1 31 57 -23 -29 41 21 -30 42 16 -28 58 11 -31 25 37 176 0 0 -29 43 5 7 21 57 32 57 -24 -29 12 32 -30 13 40 -28 29 13 -30 57 10 177 0 0 -29 13 49 7 21 52 33 56 -24 -28 43 10 -29 44 31 -27 59 42 -30 28 10 178 0 0 -28 44 0 7 21 48 34 56 -25 -28 13 14 -29 14 47 -27 29 37 -29 58 36 179 0 0 -28 13 37 7 21 43 35 55 -26 -27 42 45 -28 44 31 -26 58 59 -29 28 28 180 0 0 -27 42 41 7 21 39 36 55 -27 -27 11 43 -28 13 41 -26 27 48 -28 57 47 -179 0 0 -27 11 12 7 21 34 37 54 -27 -26 40 8 -27 42 18 -25 56 5 -28 26 33 -178 0 0 -26 39 10 7 21 29 38 53 -28 -26 8 0 -27 10 23 -25 23 49 -27 54 46 -177 0 0 -26 6 37 7 21 24 39 53 -29 -25 35 21 -26 37 55 -24 51 1 -27 22 27 -176 0 0 -25 33 31 7 21 18 40 52 -29 -25 2 10 -26 4 56 -24 17 41 -26 49 36 -175 0 0 -24 59 55 7 21 13 41 52 -30 -24 28 27 -25 31 25 -23 43 51 -26 16 13 -174 0 0 -24 25 47 7 21 7 42 51 -31 -23 54 14 -24 57 23 -23 9 30 -25 42 19 -173 0 0 -23 51 9 7 21 1 43 51 -32 -23 19 31 -24 22 50 -22 34 39 -25 7 55 -172 0 0 -23 16 2 7 20 56 44 50 -32 -22 44 18 -23 47 48 -21 59 19 -24 33 0 -171 0 0 -22 40 25 7 20 49 45 50 -33 -22 8 36 -23 12 16 -21 23 30 -23 57 36 -170 0 0 -22 4 20 7 20 43 46 49 -34 -21 32 26 -22 36 16 -20 47 13 -23 21 43 -169 0 0 -21 27 47 7 20 37 47 49 -35 -20 55 49 -21 59 48 -20 10 29 -22 45 21 -168 0 0 -20 50 47 7 20 30 48 48 -35 -20 18 44 -21 22 53 -19 33 18 -22 8 33 -167 0 0 -20 13 22 7 20 23 49 48 -36 -19 41 14 -20 45 32 -18 55 42 -21 31 18 -166 0 0 -19 35 31 7 20 17 50 47 -37 -19 3 19 -20 7 45 -18 17 40 -20 53 37 -165 0 0 -18 57 15 7 20 10 52 47 -38 -18 25 0 -19 29 34 -17 39 15 -20 15 31 -164 0 0 -18 18 36 7 20 2 53 46 -38 -17 46 17 -18 50 58 -17 0 28 -19 37 1 -163 0 0 -17 39 35 7 19 55 54 46 -39 -17 7 12 -18 12 1 -16 21 18 -18 58 9 -162 0 0 -17 0 12 7 19 48 55 45 -40 -16 27 46 -17 32 41 -15 41 47 -18 18 54 -161 0 0 -16 20 29 7 19 40 56 45 -41 -15 48 0 -16 53 1 -15 1 57 -17 39 18 -160 0 0 -15 40 27 7 19 32 57 44 -41 -15 7 55 -16 13 2 -14 21 48 -16 59 23 -159 0 0 -15 0 7 7 19 24 58 44 -42 -14 27 33 -15 32 44 -13 41 22 -16 19 9 -158 0 0 -14 19 30 7 19 16 59 43 -43 -13 46 53 -14 52 10 -13 0 39 -15 38 38 -157 0 0 -13 38 37 7 19 8 61 42 -43 -13 5 59 -14 11 19 -12 19 42 -14 57 50 -156 0 0 -12 57 30 7 19 0 62 42 -44 -12 24 50 -13 30 14 -11 38 30 -14 16 47 -155 0 0 -12 16 10 7 18 52 63 41 -45 -11 43 28 -12 48 55 -10 57 7 -13 35 31 -154 0 0 -11 34 38 7 18 43 64 40 -45 -11 1 55 -12 7 25 -10 15 32 -12 54 2 -153 0 0 -10 52 56 7 18 35 65 40 -46 -10 20 12 -11 25 43 - 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Uncertainty in time = +/- 5 secs [Prediction of 2008 Jun 29.0] Data for the target star ------------------------ * name: 2UCAC 34862381 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 07 39.6325 DE: +08 33 29.072 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .041 ) * V mag [mag]: 13.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (148) Gallia approx. diameter [km]: 98 approx. diameter ["]: .060 distance from Earth [AU]: 2.24700 * orbital information: orbit source: Preston date of fit: 2008 Jun 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1336 number of rejected observations: 124 time covered by the observations: 1900 Jan 13 - 2008 Jun 17 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.011, 100° remarks: * orbital elements for (148) Gallia : Mean anomaly = 242.18815868 deg Arg. of pericenter = 252.00078447 deg Long. of node = 145.15346057 deg Inclination = 25.29860042 deg Eccentricity = 0.18623758 Semimajor axis = 2.77213140 AU Perihelion dist = 2.25585635 AU Mag: H = 7.55, G = 0.15 Epoch of elements : MJD 54653.30200000 TDT (2008 Jul 06.302) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 6 148 Gallia 7h 15.5m UT 13.3 17 7 39.633 8 33 29.072UCAC 34862381 0.0 12.6 98 7.1 2.247 -1.681 -17.53 -136.5949 8.563 72.34 22.64 7.2576 0.06528 -0.09306 -6.37589 -4.47788 0.00253 -0.00282 2000 241.4830432008 7 3.00000252.000784145.153461 25.2986000.18623758 2.7721314 2.2558564 7.6 5.00.15 RATE 2.1354200 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.042 91 1.71 0.042 0 54646.5020080706_862381 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 29, 15:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org