IOTA/IOTA-ES occultation update for (170) Maria / TYC 6867-00950-1 event on 2009 Aug 01, 16:48 UT Visible from Summary ------- On 2009 Aug 01 UT, the 44 km diameter asteroid (170) Maria will occult a 10.7 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 13.5 mag (the magnitude of the asteroid) for at most 4.4 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: 69 * date and approx. time of event: 2009 Aug 01, 16:40 - 2009 Aug 01, 16:56 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.4 * Moon: 84 % sunlit, 18° distance * Sun: 150° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 57 * 1 sigma uncertainty interval [path widths]: +/- 0.85 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .026", 80° ) * approx speed of asteroid's shadow [km/s]: 10.1052 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6867-00950-1 by 170 Maria on 2009 Aug 1 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 39 0 0 48 10 6 16 56 26 7 147 0 48 34 44 47 45 42 49 17 8 47 4 44 40 0 0 47 21 0 16 56 24 9 148 -1 47 45 33 46 56 41 48 27 49 46 15 50 41 0 0 46 31 26 16 56 22 10 148 -2 46 55 53 46 7 12 47 38 0 45 26 30 42 0 0 45 41 26 16 56 19 11 149 -3 46 5 48 45 17 18 46 47 43 44 36 46 43 0 0 44 51 5 16 56 16 12 150 -4 45 15 19 44 27 3 45 57 4 43 46 41 44 0 0 44 0 24 16 56 13 13 150 -5 44 24 31 43 36 29 45 6 3 42 56 19 45 0 0 43 9 26 16 56 9 14 151 -6 43 33 26 42 45 39 44 14 44 42 5 41 46 0 0 42 18 16 16 56 6 15 152 -7 42 42 8 41 54 37 43 23 12 41 14 52 47 0 0 41 26 55 16 56 1 16 153 -9 41 50 38 41 3 24 42 31 27 40 23 53 48 0 0 40 35 28 16 55 57 17 153 -10 40 59 2 40 12 5 41 39 35 39 32 49 49 0 0 39 43 56 16 55 52 18 154 -11 40 7 21 39 20 43 40 47 37 38 41 41 50 0 0 38 52 23 16 55 47 19 155 -12 39 15 38 38 29 19 39 55 38 37 50 32 51 0 0 38 0 51 16 55 41 20 156 -13 38 23 57 37 37 57 39 3 39 36 59 27 52 0 0 37 9 24 16 55 35 22 156 -14 37 32 20 36 46 40 38 11 44 36 8 26 53 0 0 36 18 5 16 55 29 23 157 -15 36 40 50 35 55 31 37 19 56 35 17 33 54 0 0 35 26 55 16 55 23 24 158 -16 35 49 29 35 4 31 36 28 17 34 26 50 55 0 0 34 35 58 16 55 16 25 159 -18 34 58 21 34 13 44 35 36 51 33 36 21 56 0 0 33 45 15 16 55 9 26 159 -19 34 7 28 33 23 13 34 45 39 32 46 6 57 0 0 32 54 51 16 55 1 27 160 -20 33 16 53 32 32 58 33 54 44 31 56 10 58 0 0 32 4 45 16 54 54 28 161 -21 32 26 37 31 43 4 33 4 9 31 6 33 59 0 0 31 15 2 16 54 46 29 162 -22 31 36 43 30 53 31 32 13 56 30 17 17 60 0 0 30 25 43 16 54 38 30 162 -23 30 47 12 30 4 22 31 24 7 29 28 26 61 0 0 29 36 49 16 54 29 31 163 -24 29 58 8 29 15 40 30 34 43 28 40 1 62 0 0 28 48 24 16 54 21 32 164 -26 29 9 32 28 27 24 29 45 48 27 52 3 63 0 0 28 0 27 16 54 12 33 165 -27 28 21 25 27 39 39 28 57 22 27 4 35 64 0 0 27 13 2 16 54 3 34 166 -28 27 33 49 26 52 24 28 9 28 26 17 38 65 0 0 26 26 10 16 53 53 35 167 -29 26 46 46 26 5 42 27 22 7 25 31 13 66 0 0 25 39 52 16 53 44 36 168 -30 26 0 18 25 19 34 26 35 20 24 45 22 67 0 0 24 54 9 16 53 34 37 168 -31 25 14 25 24 34 2 25 49 9 24 0 6 68 0 0 24 9 3 16 53 24 38 169 -33 24 29 9 23 49 6 25 3 35 23 15 27 69 0 0 23 24 35 16 53 14 39 170 -34 23 44 31 23 4 48 24 18 39 22 31 25 70 0 0 22 40 46 16 53 4 40 171 -35 23 0 32 22 21 8 23 34 23 21 48 2 71 0 0 21 57 37 16 52 54 40 172 -36 22 17 13 21 38 9 22 50 48 21 5 18 72 0 0 21 15 9 16 52 43 41 173 -37 21 34 35 20 55 50 22 7 53 20 23 15 73 0 0 20 33 23 16 52 32 42 174 -38 20 52 39 20 14 13 21 25 41 19 41 53 74 0 0 19 52 19 16 52 22 43 176 -39 20 11 26 19 33 18 20 44 12 19 1 13 75 0 0 19 11 58 16 52 11 44 177 -40 19 30 56 18 53 6 20 3 27 18 21 16 76 0 0 18 32 21 16 52 0 44 178 -42 18 51 11 18 13 38 19 23 25 17 42 2 77 0 0 17 53 28 16 51 49 45 179 -43 18 12 9 17 34 53 18 44 9 17 3 31 78 0 0 17 15 20 16 51 38 46 180 -44 17 33 53 16 56 54 18 5 38 16 25 45 79 0 0 16 37 58 16 51 26 46 181 -45 16 56 22 16 19 39 17 27 53 15 48 44 80 0 0 16 1 20 16 51 15 47 183 -46 16 19 37 15 43 10 16 50 54 15 12 28 81 0 0 15 25 29 16 51 4 47 184 -47 15 43 38 15 7 26 16 14 41 14 36 58 82 0 0 14 50 25 16 50 52 48 185 -48 15 8 25 14 32 29 15 39 15 14 2 13 83 0 0 14 16 6 16 50 41 48 187 -49 14 34 0 13 58 18 15 4 37 13 28 14 84 0 0 13 42 35 16 50 30 49 188 -50 14 0 21 13 24 54 14 30 45 12 55 2 85 0 0 13 9 50 16 50 18 49 189 -51 13 27 29 12 52 16 13 57 41 12 22 36 86 0 0 12 37 52 16 50 7 49 191 -52 12 55 25 12 20 25 13 25 25 11 50 56 87 0 0 12 6 42 16 49 55 50 192 -53 12 24 8 11 49 21 12 53 57 11 20 3 88 0 0 11 36 19 16 49 44 50 193 -54 11 53 38 11 19 5 12 23 16 10 49 57 89 0 0 11 6 43 16 49 32 50 195 -55 11 23 56 10 49 35 11 53 23 10 20 38 90 0 0 10 37 55 16 49 21 50 196 -56 10 55 1 10 20 53 11 24 18 9 52 5 91 0 0 10 9 54 16 49 9 51 198 -57 10 26 54 9 52 57 10 56 1 9 24 20 92 0 0 9 42 40 16 48 58 51 199 -58 9 59 35 9 25 49 10 28 31 8 57 21 93 0 0 9 16 14 16 48 46 51 201 -58 9 33 3 8 59 28 10 1 50 8 31 9 94 0 0 8 50 35 16 48 35 51 202 -59 9 7 19 8 33 54 9 35 56 8 5 44 95 0 0 8 25 43 16 48 24 51 203 -60 8 42 22 8 9 8 9 10 50 7 41 6 96 0 0 8 1 38 16 48 12 51 205 -61 8 18 12 7 45 8 8 46 32 7 17 14 97 0 0 7 38 21 16 48 1 51 206 -62 7 54 50 7 21 56 8 23 2 6 54 10 98 0 0 7 15 51 16 47 50 51 208 -62 7 32 15 6 59 30 8 0 19 6 31 52 99 0 0 6 54 7 16 47 39 51 209 -63 7 10 28 6 37 51 7 38 24 6 10 20 100 0 0 6 33 11 16 47 28 50 210 -64 6 49 27 6 16 59 7 17 16 5 49 35 101 0 0 6 13 1 16 47 17 50 211 -64 6 29 13 5 56 53 6 56 55 5 29 36 102 0 0 5 53 38 16 47 6 50 213 -65 6 9 46 5 37 34 6 37 21 5 10 23 103 0 0 5 35 2 16 46 55 50 214 -66 5 51 6 5 19 1 6 18 35 4 51 57 104 0 0 5 17 12 16 46 44 49 215 -66 5 33 13 5 1 15 6 0 35 4 34 16 105 0 0 5 0 9 16 46 34 49 216 -67 5 16 6 4 44 15 5 43 23 4 17 22 106 0 0 4 43 52 16 46 23 49 218 -67 4 59 46 4 28 1 5 26 57 4 1 13 107 0 0 4 28 21 16 46 13 48 219 -67 4 44 12 4 12 33 5 11 18 3 45 51 108 0 0 4 13 36 16 46 2 48 220 -68 4 29 25 3 57 52 4 56 25 3 31 14 109 0 0 3 59 38 16 45 52 48 221 -68 4 15 23 3 43 56 4 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24 2 13 3 140 0 0 3 4 50 16 41 34 25 238 -55 3 20 32 2 49 13 3 47 20 2 22 47 141 0 0 3 15 28 16 41 28 24 238 -54 3 31 12 2 59 48 3 58 4 2 33 18 142 0 0 3 26 54 16 41 22 23 238 -53 3 42 40 3 11 11 4 9 37 2 44 36 143 0 0 3 39 8 16 41 17 22 238 -52 3 54 57 3 23 22 4 22 0 2 56 43 144 0 0 3 52 11 16 41 12 21 239 -51 4 8 3 3 36 22 4 35 11 3 9 38 145 0 0 4 6 3 16 41 7 20 239 -50 4 21 58 3 50 11 4 49 12 3 23 21 146 0 0 4 20 44 16 41 2 19 239 -49 4 36 43 4 4 49 5 4 2 3 37 53 147 0 0 4 36 15 16 40 57 18 239 -48 4 52 18 4 20 16 5 19 43 3 53 15 148 0 0 4 52 36 16 40 53 17 239 -47 5 8 42 4 36 33 5 36 14 4 9 25 149 0 0 5 9 46 16 40 48 17 240 -46 5 25 57 4 53 40 5 53 36 4 26 25 150 0 0 5 27 48 16 40 44 16 240 -45 5 44 2 5 11 37 6 11 49 4 44 16 151 0 0 5 46 40 16 40 41 15 240 -44 6 2 59 5 30 25 6 30 53 5 2 56 152 0 0 6 6 23 16 40 37 13 240 -43 6 22 47 5 50 3 6 50 49 5 22 27 153 0 0 6 26 57 16 40 34 12 240 -42 6 43 26 6 10 33 7 11 36 5 42 49 154 0 0 6 48 24 16 40 31 11 240 -41 7 4 57 6 31 54 7 33 16 6 4 2 155 0 0 7 10 42 16 40 28 10 240 -40 7 27 21 6 54 7 7 55 49 6 26 6 156 0 0 7 33 53 16 40 25 9 241 -39 7 50 37 7 17 13 8 19 14 6 49 2 157 0 0 7 57 56 16 40 23 8 241 -38 8 14 46 7 41 10 8 43 33 7 12 50 158 0 0 8 22 52 16 40 21 7 241 -37 8 39 48 8 6 0 9 8 45 7 37 31 159 0 0 8 48 41 16 40 19 6 241 -36 9 5 43 8 31 44 9 34 51 8 3 4 160 0 0 9 15 24 16 40 18 5 241 -35 9 32 32 8 58 20 10 1 52 8 29 30 161 0 0 9 43 0 16 40 16 4 241 -34 10 0 15 9 25 50 10 29 46 8 56 49 162 0 0 10 11 31 16 40 16 3 242 -33 10 28 53 9 54 14 10 58 35 .. .. .. 163 0 0 10 40 56 16 40 15 2 242 -32 10 58 24 10 23 32 11 28 19 .. .. .. 164 0 0 11 11 15 16 40 15 1 242 -31 11 28 51 10 53 43 11 58 58 .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6867-00950-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 44 04.4938 DE: -27 19 32.657 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.7 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (170) Maria approx. diameter [km]: 44 approx. diameter ["]: .034 distance from Earth [AU]: 1.78600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 657 number of rejected observations: 63 time covered by the observations: 1904 Nov 12 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.015, 73° remarks: * orbital elements for (170) Maria : Mean anomaly = 192.78179118 deg Arg. of pericenter = 157.38572777 deg Long. of node = 301.46157689 deg Inclination = 14.40259899 deg Eccentricity = 0.06380181 Semimajor axis = 2.55377189 AU Perihelion dist = 2.39083663 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 55044.70000000 TDT (2009 Aug 01.700) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 1 170 Maria 16h 48.4m UT 10.7 18 44 4.494-27 19 32.66TYC 6867-00950-1 12.3 13.5 44 4.4 1.786 -1.891 12.37 78.4873 -27.328 -70.52 17.86 16.8069 0.27692 0.56574 -5.12109 2.51114 0.00271 0.00057 2000 191.6467052009 728.00000157.385728301.461577 14.4025990.06380181 2.5537719 2.3908366 9.4 5.00.15 RATE 2.4150770 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.026 80 1.85 0.029 0 54545.5020090801_0950-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org