IOTA/IOTA-ES occultation update for (196) Philomela / UCAC4 308-224656 event on 2023 Oct 02, 01:49 UT Visible from N USA Summary ------- On 2023 Oct 02 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across N USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.75 mag to 12.38 mag (the magnitude of the asteroid) for at most 7.740 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2023 Oct 02, 01:46 - 2023 Oct 02, 01:52 * geocentric midpoint of event [JD]: 2460219.57612308 * magnitude of target star: 12.39 * magnitude drop [mag]: 0.75 * estimated maximum duration [s]: 7.740 * Moon: 90 % sunlit, 129° distance * Sun: 87° distance * rough path description: N USA The occultation path -------------------- * approximate projected width [km]: 319 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.001", 95°) * approx speed of asteroid's shadow [km/s]: 18.0925 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 308-224656 by 196 Philomela on 2023 Oct 2 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -173 0 0 .. .. .... .. .. .. .. .. .. 48 44 8 .. .. .. 48 38 14 .. .. .. .... -172 0 0 .. .. .... .. .. .. .. .. .. 48 3 16 .. .. .. 47 57 29 .. .. .. .... -171 0 1 49 23 1 1 47 3.7 0 137 28 47 23 24 .. .. .. 47 17 43 .. .. .. .... -170 0 1 48 41 50 1 47 3.9 1 138 28 46 44 32 .. .. .. 46 38 57 .. .. .. -1.06 -169 0 1 48 1 47 1 47 4.3 2 139 28 46 6 38 50 9 19 46 1 9 50 16 5 -1.46 -168 0 1 47 22 51 1 47 4.9 3 140 28 45 29 44 49 27 37 45 24 21 49 34 14 -1.63 -167 0 1 46 45 2 1 47 5.8 4 140 28 44 53 50 48 47 14 44 48 31 48 53 41 -1.72 -166 0 1 46 8 18 1 47 6.8 5 141 27 44 18 54 48 8 7 44 13 40 48 14 26 -1.78 -165 0 1 45 32 39 1 47 8.0 6 142 27 43 44 57 47 30 15 43 39 47 47 36 26 -1.82 -164 0 1 44 58 5 1 47 9.5 7 143 27 43 11 59 46 53 36 43 6 53 46 59 40 -1.85 -163 0 1 44 24 35 1 47 11.1 8 143 27 42 40 0 46 18 9 42 34 58 46 24 7 -1.88 -162 0 1 43 52 9 1 47 12.9 9 144 27 42 8 59 45 43 54 42 4 2 45 49 45 -1.90 -161 0 1 43 20 47 1 47 14.8 9 145 26 41 38 57 45 10 49 41 34 3 45 16 34 -1.91 -160 0 1 42 50 28 1 47 17.0 10 146 26 41 9 54 44 38 54 41 5 3 44 44 34 -1.93 -159 0 1 42 21 11 1 47 19.3 11 146 26 40 41 49 44 8 7 40 37 2 44 13 42 -1.94 -158 0 1 41 52 57 1 47 21.8 12 147 25 40 14 43 43 38 29 40 9 59 43 43 58 -1.95 -157 0 1 41 25 45 1 47 24.4 13 148 25 39 48 35 43 9 57 39 43 54 43 15 22 -1.96 -156 0 1 40 59 35 1 47 27.2 14 149 24 39 23 26 42 42 33 39 18 47 42 47 54 -1.97 -155 0 1 40 34 27 1 47 30.2 14 149 24 38 59 15 42 16 15 38 54 39 42 21 31 -1.97 -154 0 1 40 10 20 1 47 33.3 15 150 23 38 36 2 41 51 2 38 31 28 41 56 15 -1.98 -153 0 1 39 47 15 1 47 36.5 16 151 23 38 13 47 41 26 55 38 9 15 41 32 5 -1.98 -152 0 1 39 25 10 1 47 39.8 16 152 22 37 52 30 41 3 52 37 48 1 41 8 59 -1.99 -151 0 1 39 4 7 1 47 43.3 17 153 22 37 32 12 40 41 55 37 27 44 40 46 58 -2.00 -150 0 1 38 44 4 1 47 46.9 18 153 21 37 12 51 40 21 1 37 8 26 40 26 2 -2.00 -149 0 1 38 25 2 1 47 50.7 18 154 20 36 54 28 40 1 12 36 50 5 40 6 10 -2.00 -148 0 1 38 7 0 1 47 54.5 19 155 20 36 37 3 39 42 25 36 32 41 39 47 21 -2.01 -147 0 1 37 49 58 1 47 58.5 20 156 19 36 20 36 39 24 43 36 16 16 39 29 36 -2.01 -146 0 1 37 33 57 1 48 2.5 20 157 18 36 5 6 39 8 3 36 0 48 39 12 54 -2.02 -145 0 1 37 18 55 1 48 6.7 21 158 18 35 50 35 38 52 26 35 46 17 38 57 15 -2.02 -144 0 1 37 4 53 1 48 10.9 21 158 17 35 37 1 38 37 52 35 32 44 38 42 39 -2.02 -143 0 1 36 51 52 1 48 15.3 22 159 16 35 24 24 38 24 20 35 20 9 38 29 6 -2.03 -142 0 1 36 39 49 1 48 19.7 22 160 16 35 12 45 38 11 50 35 8 31 38 16 35 -2.03 -141 0 1 36 28 47 1 48 24.2 23 161 15 35 2 3 38 0 23 34 57 50 38 5 6 -2.03 -140 0 1 36 18 43 1 48 28.8 23 162 14 34 52 19 37 49 57 34 48 7 37 54 39 -2.03 -139 0 1 36 9 40 1 48 33.4 23 163 13 34 43 32 37 40 33 34 39 21 37 45 14 -2.04 -138 0 1 36 1 35 1 48 38.1 24 164 13 34 35 43 37 32 11 34 31 32 37 36 50 -2.04 -137 0 1 35 54 30 1 48 42.9 24 165 12 34 28 51 37 24 50 34 24 41 37 29 29 -2.04 -136 0 1 35 48 24 1 48 47.8 24 166 11 34 22 56 37 18 31 34 18 47 37 23 9 -2.04 -135 0 1 35 43 17 1 48 52.6 25 167 10 34 17 59 37 13 13 34 13 50 37 17 51 -2.04 -134 0 1 35 39 9 1 48 57.6 25 168 9 34 13 59 37 8 57 34 9 50 37 13 34 -2.05 -133 0 1 35 36 1 1 49 2.5 25 169 9 34 10 56 37 5 42 34 6 47 37 10 18 -2.05 -132 0 1 35 33 52 1 49 7.5 25 170 8 34 8 50 37 3 28 34 4 42 37 8 4 -2.05 -131 0 1 35 32 41 1 49 12.6 26 171 7 34 7 42 37 2 15 34 3 34 37 6 52 -2.05 -130 0 1 35 32 30 1 49 17.6 26 172 6 34 7 31 37 2 4 34 3 23 37 6 40 -2.05 -129 0 1 35 33 18 1 49 22.7 26 173 5 34 8 17 37 2 54 34 4 9 37 7 31 -2.05 -128 0 1 35 35 6 1 49 27.8 26 174 5 34 10 1 37 4 46 34 5 52 37 9 22 -2.06 -127 0 1 35 37 52 1 49 33.0 26 175 4 34 12 42 37 7 38 34 8 33 37 12 15 -2.06 -126 0 1 35 41 38 1 49 38.1 26 176 3 34 16 20 37 11 33 34 12 11 37 16 10 -2.06 -125 0 1 35 46 23 1 49 43.2 26 177 2 34 20 56 37 16 28 34 16 47 37 21 6 -2.06 -124 0 1 35 52 7 1 49 48.3 26 178 1 34 26 29 37 22 26 34 22 19 37 27 4 -2.06 -123 0 1 35 58 51 1 49 53.5 26 179 0 34 33 0 37 29 24 34 28 50 37 34 4 -2.06 -122 0 1 36 6 34 1 49 58.6 26 180 0 34 40 28 37 37 25 34 36 17 37 42 6 -2.06 -121 0 1 36 15 17 1 50 3.7 25 181 -1 34 48 54 37 46 28 34 44 42 37 51 9 -2.06 -120 0 1 36 24 59 1 50 8.7 25 182 -2 34 58 18 37 56 32 34 54 5 38 1 15 -2.06 -119 0 1 36 35 41 1 50 13.8 25 183 -3 35 8 39 38 7 39 35 4 25 38 12 23 -2.06 -118 0 1 36 47 23 1 50 18.8 25 184 -4 35 19 58 38 19 49 35 15 44 38 24 35 -2.06 -117 0 1 37 0 6 1 50 23.8 25 185 -5 35 32 16 38 33 1 35 28 0 38 37 48 -2.06 -116 0 1 37 13 48 1 50 28.7 24 185 -5 35 45 31 38 47 16 35 41 13 38 52 5 -2.06 -115 0 1 37 28 31 1 50 33.6 24 186 -6 35 59 44 39 2 34 35 55 25 39 7 25 -2.06 -114 0 1 37 44 14 1 50 38.4 24 187 -7 36 14 55 39 18 55 36 10 35 39 23 48 -2.07 -113 0 1 38 0 58 1 50 43.2 23 188 -8 36 31 5 39 36 20 36 26 43 39 41 15 -2.07 -112 0 1 38 18 43 1 50 47.9 23 189 -9 36 48 12 39 54 49 36 43 49 39 59 46 -2.07 -111 0 1 38 37 28 1 50 52.5 22 190 -9 37 6 19 40 14 21 37 1 54 40 19 22 -2.07 -110 0 1 38 57 15 1 50 57.1 22 191 -10 37 25 24 40 34 59 37 20 57 40 40 2 -2.07 -109 0 1 39 18 3 1 51 1.6 21 192 -11 37 45 27 40 56 41 37 40 58 41 1 47 -2.07 -108 0 1 39 39 53 1 51 6.0 21 193 -12 38 6 29 41 19 28 38 1 58 41 24 38 -2.07 -107 0 1 40 2 44 1 51 10.3 20 194 -12 38 28 29 41 43 21 38 23 56 41 48 34 -2.07 -106 0 1 40 26 37 1 51 14.5 20 195 -13 38 51 29 42 8 20 38 46 53 42 13 36 -2.07 -105 0 1 40 51 33 1 51 18.6 19 196 -14 39 15 28 42 34 26 39 10 49 42 39 46 -2.07 -104 0 1 41 17 32 1 51 22.6 19 197 -15 39 40 26 43 1 38 39 35 45 43 7 3 -2.07 -103 0 1 41 44 33 1 51 26.5 18 197 -15 40 6 23 43 29 58 40 1 39 43 35 28 -2.07 -102 0 1 42 12 37 1 51 30.2 17 198 -16 40 33 19 43 59 27 40 28 32 44 5 1 -2.07 -101 0 1 42 41 44 1 51 33.8 16 199 -17 41 1 15 44 30 4 40 56 24 44 35 43 -2.07 -100 0 1 43 11 55 1 51 37.3 16 200 -17 41 30 9 45 1 51 41 25 15 45 7 35 -2.07 - 99 0 1 43 43 10 1 51 40.7 15 201 -18 42 0 4 45 34 48 41 55 6 45 40 38 -2.07 - 98 0 1 44 15 29 1 51 43.9 14 202 -18 42 30 57 46 8 56 42 25 56 46 14 52 -2.08 - 97 0 1 44 48 53 1 51 47.0 13 203 -19 43 2 51 46 44 16 42 57 46 46 50 19 -2.08 - 96 0 1 45 23 22 1 51 49.9 13 203 -20 43 35 44 47 20 50 43 30 35 47 27 0 -2.08 - 95 0 1 45 58 56 1 51 52.6 12 204 -20 44 9 37 47 58 37 44 4 23 48 4 56 -2.08 - 94 0 1 46 35 37 1 51 55.2 11 205 -21 44 44 30 48 37 41 44 39 11 48 44 8 -2.09 - 93 0 1 47 13 25 1 51 57.6 10 206 -21 45 20 22 49 18 2 45 14 59 49 24 38 -2.09 - 92 0 1 47 52 19 1 51 59.8 9 207 -21 45 57 15 49 59 42 45 51 46 50 6 27 -2.10 - 91 0 1 48 32 22 1 52 1.8 8 207 -22 46 35 8 50 42 43 46 29 34 50 49 39 -2.10 - 90 0 1 49 13 34 1 52 3.6 7 208 -22 47 14 2 51 27 7 47 8 21 51 34 15 -2.11 - 89 0 1 49 55 55 1 52 5.3 6 209 -23 47 53 55 52 12 57 47 48 9 52 20 18 -2.13 - 88 0 1 50 39 28 1 52 6.7 6 210 -23 48 34 50 53 0 16 48 28 56 53 7 51 -2.14 - 87 0 1 51 24 12 1 52 7.9 5 211 -23 49 16 45 53 49 8 49 10 44 53 56 58 -2.16 - 86 0 1 52 10 9 1 52 8.8 4 211 -23 49 59 40 54 39 36 49 53 32 54 47 44 -2.20 - 85 0 1 52 57 22 1 52 9.5 3 212 -23 50 43 37 55 31 48 50 37 21 55 40 15 -2.27 - 84 0 1 53 45 51 1 52 10.0 2 213 -24 51 28 36 .. .. .. 51 22 11 .. .. .. -2.41 - 83 0 1 54 35 38 1 52 10.3 1 214 -24 52 14 36 .. .. .. 52 8 2 .. .. .. -3.06 - 82 0 0 .. .. .... .. .. .. .. .. .. 53 1 38 .. .. .. 52 54 54 .. .. .. .... - 81 0 0 .. .. .... .. .. .. .. .. .. 53 49 43 .. .. .. 53 42 48 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 308-224656 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 24 25.4910 DE: -28 24 36.373 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 24 25.4910 DE: -28 24 36.373 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.065 distance from Earth [AU]: 2.95250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#132 date of fit: 2023 Aug 22 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.006", 0.001", 95.47° remarks: * orbital elements for (196)Philomela : Mean anomaly = 18.2888189329 deg Arg. of pericenter = 203.5784760897 deg Long. of node = 72.2992614573 deg Inclination = 7.2629549940 deg Eccentricity = 0.0147118084 Semimajor axis = 3.1127477068 AU Perihelion dist = 3.0669535590 AU Mag: H = 6.74, G = 0.15 Epoch of elements : MJD 60219.07618055 TDT (2023 Oct 02.0762) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1322023Aug22,7.74,2023,10,2,1.826954,-0.067302,0.895647,10.183455,0.762100,0.005763,0.000234,0.000000,0.000000 -121.4572,-28.3987,149.99,-3.42,False UCAC4 308-224656,18.40708086,-28.4101036,0.00,12.39,0.00,0.0,0,,18.43191919,-28.3986546,0.75,0.00,0,0,0 196,Philomela,12.38,140.100,2.9525,0,0,2.299,2.27,,8.0,0 0,18.0957,2023,10,1,203.5785,72.2993,7.2630,0.01471,3.11275,3.06695,6.63,5.0,0.15 1.025,0.0057,0.0013,95,0.0058,Known errors,-1.00,0,-1,-1 20231002_224656,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org