IOTA/IOTA-ES occultation update for (18) Melpomene / TYC 5252-00205-1 event on 2009 Jun 11, 15:52 UT Visible from Summary ------- On 2009 Jun 11 UT, the 141 km diameter asteroid (18) Melpomene will occult a 11.8 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 10.4 mag (the magnitude of the asteroid) for at most 5.7 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: 2009 Jun 11, 15:49 - 2009 Jun 11, 15:53 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 5.7 * Moon: 87 % sunlit, 55° distance * Sun: 83° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 174 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .022", 89° ) * approx speed of asteroid's shadow [km/s]: 24.8541 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5252-00205-1 by 18 Melpomene on 2009 Jun 11 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 130 0 0 -50 46 4 15 49 40 0 90 -62 -51 33 18 -49 59 18 -51 54 14 -49 38 52 131 0 0 -50 46 3 15 49 40 1 89 -62 -51 33 17 -49 59 17 -51 54 13 -49 38 51 132 0 0 -50 45 49 15 49 40 1 88 -61 -51 33 3 -49 59 3 -51 53 59 -49 38 37 133 0 0 -50 45 23 15 49 41 2 88 -61 -51 32 37 -49 58 37 -51 53 33 -49 38 11 134 0 0 -50 44 45 15 49 41 3 87 -61 -51 31 59 -49 57 58 -51 52 55 -49 37 32 135 0 0 -50 43 53 15 49 41 3 86 -61 -51 31 7 -49 57 7 -51 52 4 -49 36 40 136 0 0 -50 42 49 15 49 41 4 85 -60 -51 30 4 -49 56 3 -51 51 0 -49 35 36 137 0 0 -50 41 33 15 49 41 5 85 -60 -51 28 48 -49 54 46 -51 49 44 -49 34 19 138 0 0 -50 40 4 15 49 42 5 84 -60 -51 27 19 -49 53 16 -51 48 16 -49 32 49 139 0 0 -50 38 22 15 49 42 6 83 -60 -51 25 38 -49 51 34 -51 46 35 -49 31 6 140 0 0 -50 36 28 15 49 42 7 82 -59 -51 23 44 -49 49 39 -51 44 42 -49 29 11 141 0 0 -50 34 21 15 49 43 7 81 -59 -51 21 38 -49 47 31 -51 42 36 -49 27 3 142 0 0 -50 32 1 15 49 43 8 81 -59 -51 19 20 -49 45 11 -51 40 18 -49 24 42 143 0 0 -50 29 29 15 49 44 8 80 -58 -51 16 48 -49 42 37 -51 37 47 -49 22 9 144 0 0 -50 26 44 15 49 44 9 79 -58 -51 14 4 -49 39 51 -51 35 3 -49 19 22 145 0 0 -50 23 46 15 49 45 10 78 -58 -51 11 8 -49 36 53 -51 32 7 -49 16 23 146 0 0 -50 20 36 15 49 46 10 78 -57 -51 7 59 -49 33 41 -51 28 59 -49 13 11 147 0 0 -50 17 13 15 49 46 11 77 -57 -51 4 37 -49 30 17 -51 25 38 -49 9 47 148 0 0 -50 13 38 15 49 47 12 76 -56 -51 1 3 -49 26 40 -51 22 4 -49 6 9 149 0 0 -50 9 50 15 49 48 12 75 -56 -50 57 16 -49 22 51 -51 18 18 -49 2 19 150 0 0 -50 5 49 15 49 48 13 74 -55 -50 53 17 -49 18 48 -51 14 19 -48 58 16 151 0 0 -50 1 35 15 49 49 14 74 -55 -50 49 5 -49 14 33 -51 10 8 -48 54 0 152 0 0 -49 57 9 15 49 50 14 73 -55 -50 44 40 -49 10 5 -51 5 44 -48 49 32 153 0 0 -49 52 30 15 49 51 15 72 -54 -50 40 3 -49 5 25 -51 1 8 -48 44 50 154 0 0 -49 47 38 15 49 52 15 71 -54 -50 35 13 -49 0 31 -50 56 19 -48 39 56 155 0 0 -49 42 34 15 49 53 16 70 -53 -50 30 10 -48 55 25 -50 51 17 -48 34 49 156 0 0 -49 37 17 15 49 54 17 70 -53 -50 24 55 -48 50 6 -50 46 3 -48 29 29 157 0 0 -49 31 47 15 49 55 17 69 -52 -50 19 28 -48 44 34 -50 40 36 -48 23 57 158 0 0 -49 26 4 15 49 56 18 68 -52 -50 13 47 -48 38 50 -50 34 56 -48 18 11 159 0 0 -49 20 9 15 49 57 19 67 -51 -50 7 54 -48 32 53 -50 29 4 -48 12 13 160 0 0 -49 14 1 15 49 58 19 66 -51 -50 1 49 -48 26 43 -50 23 0 -48 6 2 161 0 0 -49 7 41 15 50 0 20 66 -50 -49 55 30 -48 20 20 -50 16 42 -47 59 39 162 0 0 -49 1 8 15 50 1 21 65 -50 -49 48 59 -48 13 45 -50 10 13 -47 53 2 163 0 0 -48 54 22 15 50 2 21 64 -49 -49 42 16 -48 6 57 -50 3 30 -47 46 13 164 0 0 -48 47 23 15 50 4 22 63 -48 -49 35 20 -47 59 56 -49 56 35 -47 39 12 165 0 0 -48 40 12 15 50 5 23 62 -48 -49 28 11 -47 52 42 -49 49 28 -47 31 57 166 0 0 -48 32 49 15 50 7 23 61 -47 -49 20 50 -47 45 16 -49 42 8 -47 24 30 167 0 0 -48 25 12 15 50 8 24 61 -47 -49 13 16 -47 37 37 -49 34 35 -47 16 50 168 0 0 -48 17 24 15 50 10 24 60 -46 -49 5 30 -47 29 46 -49 26 50 -47 8 58 169 0 0 -48 9 22 15 50 11 25 59 -46 -48 57 31 -47 21 42 -49 18 52 -47 0 53 170 0 0 -48 1 8 15 50 13 26 58 -45 -48 49 20 -47 13 26 -49 10 42 -46 52 35 171 0 0 -47 52 42 15 50 14 26 57 -44 -48 40 57 -47 4 57 -49 2 20 -46 44 5 172 0 0 -47 44 3 15 50 16 27 56 -44 -48 32 21 -46 56 15 -48 53 45 -46 35 23 173 0 0 -47 35 12 15 50 18 28 55 -43 -48 23 32 -46 47 22 -48 44 58 -46 26 28 174 0 0 -47 26 8 15 50 20 28 55 -42 -48 14 31 -46 38 15 -48 35 58 -46 17 20 175 0 0 -47 16 53 15 50 22 29 54 -42 -48 5 18 -46 28 57 -48 26 46 -46 8 0 176 0 0 -47 7 25 15 50 24 30 53 -41 -47 55 53 -46 19 26 -48 17 22 -45 58 28 177 0 0 -46 57 44 15 50 26 30 52 -40 -47 46 15 -46 9 43 -48 7 46 -45 48 44 178 0 0 -46 47 52 15 50 27 31 51 -40 -47 36 26 -45 59 48 -47 57 58 -45 38 48 179 0 0 -46 37 47 15 50 30 32 50 -39 -47 26 24 -45 49 40 -47 47 57 -45 28 39 180 0 0 -46 27 31 15 50 32 32 49 -38 -47 16 10 -45 39 21 -47 37 45 -45 18 19 -179 0 0 -46 17 2 15 50 34 33 48 -38 -47 5 45 -45 28 50 -47 27 21 -45 7 46 -178 0 0 -46 6 22 15 50 36 33 47 -37 -46 55 7 -45 18 7 -47 16 44 -44 57 2 -177 0 0 -45 55 30 15 50 38 34 46 -36 -46 44 18 -45 7 12 -47 5 56 -44 46 6 -176 0 0 -45 44 26 15 50 40 35 45 -36 -46 33 17 -44 56 5 -46 54 56 -44 34 58 -175 0 0 -45 33 10 15 50 43 35 44 -35 -46 22 4 -44 44 47 -46 43 45 -44 23 39 -174 0 0 -45 21 44 15 50 45 36 43 -34 -46 10 40 -44 33 18 -46 32 22 -44 12 8 -173 0 0 -45 10 5 15 50 48 37 42 -34 -45 59 4 -44 21 37 -46 20 48 -44 0 26 -172 0 0 -44 58 16 15 50 50 37 41 -33 -45 47 18 -44 9 45 -46 9 2 -43 48 33 -171 0 0 -44 46 15 15 50 53 38 40 -32 -45 35 20 -43 57 41 -45 57 5 -43 36 29 -170 0 0 -44 34 3 15 50 55 38 39 -31 -45 23 11 -43 45 27 -45 44 58 -43 24 13 -169 0 0 -44 21 41 15 50 58 39 38 -31 -45 10 51 -43 33 2 -45 32 39 -43 11 47 -168 0 0 -44 9 7 15 51 0 40 37 -30 -44 58 20 -43 20 26 -45 20 9 -42 59 10 -167 0 0 -43 56 23 15 51 3 40 36 -29 -44 45 38 -43 7 39 -45 7 29 -42 46 22 -166 0 0 -43 43 29 15 51 6 41 35 -29 -44 32 46 -42 54 43 -44 54 38 -42 33 24 -165 0 0 -43 30 24 15 51 9 42 34 -28 -44 19 44 -42 41 35 -44 41 37 -42 20 16 -164 0 0 -43 17 9 15 51 11 42 33 -27 -44 6 32 -42 28 18 -44 28 25 -42 6 58 -163 0 0 -43 3 44 15 51 14 43 31 -26 -43 53 9 -42 14 51 -44 15 4 -41 53 30 -162 0 0 -42 50 10 15 51 17 43 30 -25 -43 39 37 -42 1 14 -44 1 33 -41 39 52 -161 0 0 -42 36 26 15 51 20 44 29 -25 -43 25 55 -41 47 28 -43 47 52 -41 26 5 -160 0 0 -42 22 32 15 51 23 44 28 -24 -43 12 3 -41 33 32 -43 34 1 -41 12 9 -159 0 0 -42 8 29 15 51 26 45 27 -23 -42 58 3 -41 19 28 -43 20 1 -40 58 3 -158 0 0 -41 54 18 15 51 29 45 25 -22 -42 43 53 -41 5 14 -43 5 53 -40 43 48 -157 0 0 -41 39 57 15 51 32 46 24 -22 -42 29 34 -40 50 52 -42 51 35 -40 29 25 -156 0 0 -41 25 28 15 51 36 47 23 -21 -42 15 7 -40 36 21 -42 37 9 -40 14 54 -155 0 0 -41 10 51 15 51 39 47 21 -20 -42 0 32 -40 21 42 -42 22 34 -40 0 14 -154 0 0 -40 56 6 15 51 42 48 20 -19 -41 45 48 -40 6 55 -42 7 51 -39 45 27 -153 0 0 -40 41 12 15 51 45 48 19 -18 -41 30 57 -39 52 0 -41 53 0 -39 30 31 -152 0 0 -40 26 12 15 51 49 48 17 -18 -41 15 58 -39 36 58 -41 38 2 -39 15 29 -151 0 0 -40 11 4 15 51 52 49 16 -17 -41 0 51 -39 21 49 -41 22 56 -39 0 19 -150 0 0 -39 55 49 15 51 56 49 14 -16 -40 45 38 -39 6 33 -41 7 43 -38 45 2 -149 0 0 -39 40 28 15 51 59 50 13 -15 -40 30 17 -38 51 10 -40 52 23 -38 29 39 -148 0 0 -39 25 0 15 52 3 50 11 -14 -40 14 50 -38 35 41 -40 36 57 -38 14 9 -147 0 0 -39 9 26 15 52 6 51 10 -13 -39 59 17 -38 20 6 -40 21 24 -37 58 34 -146 0 0 -38 53 46 15 52 10 51 8 -13 -39 43 38 -38 4 25 -40 5 46 -37 42 53 -145 0 0 -38 38 0 15 52 13 51 7 -12 -39 27 54 -37 48 39 -39 50 2 -37 27 6 -144 0 0 -38 22 10 15 52 17 52 5 -11 -39 12 4 -37 32 48 -39 34 12 -37 11 15 -143 0 0 -38 6 14 15 52 20 52 4 -10 -38 56 9 -37 16 52 -39 18 18 -36 55 18 -142 0 0 -37 50 14 15 52 24 52 2 -9 -38 40 10 -37 0 52 -39 2 18 -36 39 18 -141 0 0 -37 34 10 15 52 28 53 0 -8 -38 24 6 -36 44 47 -38 46 15 -36 23 13 -140 0 0 -37 18 2 15 52 32 53 359 -8 -38 7 58 -36 28 39 -38 30 7 -36 7 5 -139 0 0 -37 1 51 15 52 35 53 357 -7 -37 51 47 -36 12 27 -38 13 56 -35 50 53 -138 0 0 -36 45 36 15 52 39 53 355 -6 -37 35 33 -35 56 12 -37 57 42 -35 34 38 -137 0 0 -36 29 19 15 52 43 54 353 -5 -37 19 15 -35 39 55 -37 41 24 -35 18 21 -136 0 0 -36 12 59 15 52 47 54 352 -4 -37 2 55 -35 23 35 -37 25 4 -35 2 1 -135 0 0 -35 56 37 15 52 51 54 350 -3 -36 46 33 -35 7 14 -37 8 42 -34 45 40 -134 0 0 -35 40 14 15 52 55 54 348 -2 -36 30 9 -34 50 51 -36 52 18 -34 29 17 -133 0 0 -35 23 49 15 52 58 54 346 -2 -36 13 44 -34 34 26 -36 35 53 -34 12 53 -132 0 0 -35 7 23 15 53 2 54 345 -1 -35 57 18 -34 18 1 -36 19 26 -33 56 28 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5252-00205-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 49 09.0266 DE: -00 11 52.481 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .038, .021 ) * V mag [mag]: 11.8 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (18) Melpomene approx. diameter [km]: 141 approx. diameter ["]: .110 distance from Earth [AU]: 1.76400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 3744 number of rejected observations: 304 time covered by the observations: 1901 Aug 14 - 2008 Feb 17 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.008, 79° remarks: * orbital elements for (18) Melpomene : Mean anomaly = 325.50121249 deg Arg. of pericenter = 227.76628077 deg Long. of node = 150.51393586 deg Inclination = 10.12859729 deg Eccentricity = 0.21846484 Semimajor axis = 2.29613061 AU Perihelion dist = 1.79450682 AU Mag: H = 6.51, G = 0.25 Epoch of elements : MJD 54993.66200000 TDT (2009 Jun 11.662) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 11 18 Melpomene 15h 53.1m UT 11.8 23 49 9.027- 0 11 52.48TYC 5252-00205-1 12.0 10.4 141 5.7 1.764 4.509 17.84 -141.1179 -0.204 -58.35 23.12 15.8856 0.14935 -0.56436 13.56430 3.57837 -0.00453 -0.00195 2000 324.4638572009 6 8.00000227.766281150.513936 10.1285970.21846484 2.2961306 1.7945068 6.5 5.00.25 RATE 2.8327560 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.022 89 1.22 0.024 0 54545.5020090611_0205-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org