IOTA/IOTA-ES occultation update for (3128) Obruchev / TYC 6891-00383-1 event on 2024 Oct 22, 16:50 UT Visible from Summary ------- On 2024 Oct 22 UT, the 21.0182449891381 km diameter asteroid (3128) Obruchev will occult a 9.8 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 7.72 mag to 17.49 mag (the magnitude of the asteroid) for at most 1.040 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: 96 * date and approx. time of event: 2024 Oct 22, 16:47 - 2024 Oct 22, 16:52 * geocentric midpoint of event [JD]: 2460606.20142729 * magnitude of target star: 9.77 * magnitude drop [mag]: 7.72 * estimated maximum duration [s]: 1.040 * Moon: 67 % sunlit, 163° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.005", 81°) * approx speed of asteroid's shadow [km/s]: 20.6448 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6891-00383-1 by 3128 Obruchev on 2024 Oct 22 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 - 49 0 0 45 7 21 16 47 34.5 1 124 29 44 53 14 45 21 36 44 41 43 45 33 24 .... - 48 0 0 44 40 21 16 47 34.7 1 124 29 44 26 21 44 54 28 44 14 56 45 6 10 -1.04 - 47 0 0 44 13 58 16 47 35.0 2 125 29 44 0 6 44 27 58 43 48 47 44 39 34 -1.32 - 46 0 0 43 48 15 16 47 35.4 3 126 29 43 34 29 44 2 8 43 23 16 44 13 38 -1.46 - 45 0 0 43 23 11 16 47 35.9 4 126 29 43 9 32 43 36 58 42 58 24 43 48 21 -1.53 - 44 0 0 42 58 47 16 47 36.6 5 127 28 42 45 14 43 12 27 42 34 11 43 23 45 -1.58 - 43 0 0 42 35 4 16 47 37.5 6 128 28 42 21 37 42 48 37 42 10 39 42 59 50 -1.62 - 42 0 0 42 12 1 16 47 38.4 6 128 28 41 58 40 42 25 28 41 47 46 42 36 36 -1.64 - 41 0 0 41 49 39 16 47 39.5 7 129 28 41 36 23 42 3 0 41 25 35 42 14 4 -1.66 - 40 0 0 41 27 58 16 47 40.7 8 130 28 41 14 48 41 41 15 41 4 4 41 52 13 -1.68 - 39 0 0 41 7 0 16 47 42.1 9 130 28 40 53 55 41 20 11 40 43 15 41 31 5 -1.69 - 38 0 0 40 46 43 16 47 43.6 10 131 27 40 33 44 40 59 49 40 23 7 41 10 39 -1.70 - 37 0 0 40 27 10 16 47 45.2 10 132 27 40 14 14 40 40 11 40 3 42 40 50 57 -1.71 - 36 0 0 40 8 19 16 47 46.9 11 133 27 39 55 28 40 21 15 39 44 59 40 31 57 -1.72 - 35 0 0 39 50 11 16 47 48.7 12 133 26 39 37 24 40 3 3 39 26 59 40 13 41 -1.73 - 34 0 0 39 32 46 16 47 50.7 13 134 26 39 20 4 39 45 34 39 9 42 39 56 8 -1.73 - 33 0 0 39 16 5 16 47 52.8 13 135 26 39 3 26 39 28 49 38 53 8 39 39 20 -1.74 - 32 0 0 39 0 8 16 47 55.0 14 135 25 38 47 33 39 12 48 38 37 17 39 23 16 -1.74 - 31 0 0 38 44 54 16 47 57.3 15 136 25 38 32 23 38 57 31 38 22 10 39 7 56 -1.75 - 30 0 0 38 30 25 16 47 59.7 16 137 24 38 17 57 38 42 58 38 7 47 38 53 21 -1.75 - 29 0 0 38 16 41 16 48 2.3 16 138 24 38 4 16 38 29 10 37 54 8 38 39 30 -1.76 - 28 0 0 38 3 41 16 48 4.9 17 138 23 37 51 19 38 16 7 37 41 13 38 26 25 -1.76 - 27 0 0 37 51 25 16 48 7.7 18 139 23 37 39 6 38 3 49 37 29 3 38 14 4 -1.77 - 26 0 0 37 39 55 16 48 10.5 18 140 22 37 27 38 37 52 16 37 17 37 38 2 29 -1.77 - 25 0 0 37 29 10 16 48 13.5 19 141 22 37 16 55 37 41 29 37 6 56 37 51 39 -1.77 - 24 0 0 37 19 9 16 48 16.5 20 142 21 37 6 57 37 31 26 36 57 0 37 41 35 -1.77 - 23 0 0 37 9 55 16 48 19.6 20 142 21 36 57 45 37 22 9 36 47 49 37 32 16 -1.78 - 22 0 0 37 1 25 16 48 22.9 21 143 20 36 49 17 37 13 38 36 39 22 37 23 43 -1.78 - 21 0 0 36 53 41 16 48 26.2 21 144 19 36 41 34 37 5 52 36 31 41 37 15 56 -1.78 - 20 0 0 36 46 42 16 48 29.6 22 145 19 36 34 37 36 58 52 36 24 45 37 8 55 -1.78 - 19 0 0 36 40 29 16 48 33.0 23 146 18 36 28 26 36 52 38 36 18 35 37 2 40 -1.79 - 18 0 0 36 35 2 16 48 36.6 23 147 17 36 23 0 36 47 10 36 13 10 36 57 10 -1.79 - 17 0 0 36 30 21 16 48 40.2 24 147 17 36 18 19 36 42 27 36 8 30 36 52 27 -1.79 - 16 0 0 36 26 25 16 48 43.9 24 148 16 36 14 25 36 38 31 36 4 36 36 48 30 -1.79 - 15 0 0 36 23 16 16 48 47.7 25 149 15 36 11 16 36 35 21 36 1 28 36 45 19 -1.79 - 14 0 0 36 20 52 16 48 51.6 25 150 15 36 8 53 36 32 57 35 59 5 36 42 55 -1.80 - 13 0 0 36 19 15 16 48 55.5 25 151 14 36 7 16 36 31 19 35 57 28 36 41 17 -1.80 - 12 0 0 36 18 24 16 48 59.4 26 152 13 36 6 25 36 30 28 35 56 37 36 40 26 -1.80 - 11 0 0 36 18 19 16 49 3.5 26 153 12 36 6 20 36 30 23 35 56 32 36 40 21 -1.80 - 10 0 0 36 19 0 16 49 7.5 27 154 12 36 7 0 36 31 4 35 57 13 36 41 2 -1.80 - 9 0 0 36 20 27 16 49 11.7 27 155 11 36 8 27 36 32 32 35 58 39 36 42 30 -1.80 - 8 0 0 36 22 41 16 49 15.9 27 156 10 36 10 40 36 34 46 36 0 52 36 44 45 -1.80 - 7 0 0 36 25 41 16 49 20.1 28 157 9 36 13 39 36 37 47 36 3 50 36 47 46 -1.81 - 6 0 0 36 29 27 16 49 24.3 28 158 9 36 17 25 36 41 34 36 7 35 36 51 34 -1.81 - 5 0 0 36 33 59 16 49 28.6 28 159 8 36 21 56 36 46 7 36 12 5 36 56 8 -1.81 - 4 0 0 36 39 17 16 49 33.0 28 160 7 36 27 13 36 51 27 36 17 21 37 1 29 -1.81 - 3 0 0 36 45 22 16 49 37.3 28 161 6 36 33 16 36 57 33 36 23 23 37 7 36 -1.81 - 2 0 0 36 52 13 16 49 41.7 29 162 5 36 40 5 37 4 25 36 30 11 37 14 30 -1.81 - 1 0 0 36 59 50 16 49 46.1 29 163 5 36 47 41 37 12 4 36 37 45 37 22 11 -1.81 0 0 0 37 8 14 16 49 50.5 29 164 4 36 56 2 37 20 30 36 46 5 37 30 38 -1.81 1 0 0 37 17 23 16 49 55.0 29 165 3 37 5 10 37 29 41 36 55 11 37 39 52 -1.81 2 0 0 37 27 19 16 49 59.4 29 166 2 37 15 3 37 39 39 37 5 2 37 49 51 -1.81 3 0 0 37 38 0 16 50 3.9 29 167 1 37 25 42 37 50 23 37 15 39 38 0 37 -1.81 4 0 0 37 49 27 16 50 8.4 29 169 0 37 37 6 38 1 53 37 27 1 38 12 10 -1.81 5 0 0 38 1 41 16 50 12.9 29 170 0 37 49 17 38 14 9 37 39 9 38 24 28 -1.82 6 0 0 38 14 39 16 50 17.3 29 171 -1 38 2 12 38 27 11 37 52 3 38 37 33 -1.82 7 0 0 38 28 24 16 50 21.8 29 172 -2 38 15 54 38 40 59 38 5 41 38 51 24 -1.82 8 0 0 38 42 54 16 50 26.2 28 173 -3 38 30 20 38 55 32 38 20 5 39 6 0 -1.82 9 0 0 38 58 9 16 50 30.6 28 174 -4 38 45 31 39 10 51 38 35 13 39 21 22 -1.82 10 0 0 39 14 9 16 50 35.1 28 175 -5 39 1 28 39 26 56 38 51 7 39 37 30 -1.82 11 0 0 39 30 55 16 50 39.4 28 176 -5 39 18 9 39 43 45 39 7 45 39 54 23 -1.82 12 0 0 39 48 25 16 50 43.8 28 177 -6 39 35 35 40 1 20 39 25 7 40 12 1 -1.82 13 0 0 40 6 40 16 50 48.1 27 178 -7 39 53 46 40 19 39 39 43 14 40 30 24 -1.82 14 0 0 40 25 39 16 50 52.4 27 179 -8 40 12 40 40 38 43 40 2 5 40 49 32 -1.82 15 0 0 40 45 22 16 50 56.7 27 180 -9 40 32 18 40 58 32 40 21 39 41 9 25 -1.82 16 0 0 41 5 49 16 51 0.9 26 181 -9 40 52 40 41 19 4 40 41 57 41 30 2 -1.82 17 0 0 41 27 0 16 51 5.0 26 182 -10 41 13 46 41 40 21 41 2 58 41 51 23 -1.82 18 0 0 41 48 55 16 51 9.2 26 183 -11 41 35 35 42 2 21 41 24 43 42 13 28 -1.82 19 0 0 42 11 32 16 51 13.2 25 185 -12 41 58 6 42 25 4 41 47 9 42 36 16 -1.82 20 0 0 42 34 51 16 51 17.2 25 186 -13 42 21 20 42 48 30 42 10 18 42 59 47 -1.82 21 0 0 42 58 53 16 51 21.1 24 187 -13 42 45 15 43 12 38 42 34 8 43 24 1 -1.82 22 0 0 43 23 37 16 51 25.0 24 188 -14 43 9 52 43 37 28 42 58 40 43 48 57 -1.82 23 0 0 43 49 2 16 51 28.8 23 189 -15 43 35 10 44 3 1 43 23 53 44 14 35 -1.82 24 0 0 44 15 8 16 51 32.5 23 190 -16 44 1 9 44 29 14 43 49 46 44 40 54 -1.82 25 0 0 44 41 54 16 51 36.1 22 191 -16 44 27 48 44 56 8 44 16 19 45 7 55 -1.82 26 0 0 45 9 21 16 51 39.6 22 191 -17 44 55 7 45 23 42 44 43 31 45 35 35 -1.82 27 0 0 45 37 26 16 51 43.1 21 192 -18 45 23 4 45 51 56 45 11 22 46 3 56 -1.82 28 0 0 46 6 10 16 51 46.4 20 193 -18 45 51 40 46 20 48 45 39 51 46 32 55 -1.82 29 0 0 46 35 32 16 51 49.7 20 194 -19 46 20 53 46 50 18 46 8 58 47 2 33 -1.82 30 0 0 47 5 31 16 51 52.9 19 195 -20 46 50 44 47 20 27 46 38 41 47 32 49 -1.82 31 0 0 47 36 6 16 51 55.9 18 196 -20 47 21 10 47 51 11 47 9 0 48 3 42 -1.82 32 0 0 48 7 18 16 51 58.9 18 197 -21 47 52 12 48 22 32 47 39 55 48 35 11 -1.82 33 0 0 48 39 4 16 52 1.7 17 198 -22 48 23 48 48 54 29 48 11 23 49 7 16 -1.83 34 0 0 49 11 24 16 52 4.4 16 199 -22 48 55 58 49 26 59 48 43 25 49 39 55 -1.83 35 0 0 49 44 17 16 52 7.0 16 200 -23 49 28 41 50 0 3 49 16 0 50 13 8 -1.83 36 0 0 50 17 42 16 52 9.5 15 201 -23 50 1 56 50 33 39 49 49 6 50 46 54 -1.83 37 0 0 50 51 39 16 52 11.9 14 202 -24 50 35 41 51 7 47 50 22 43 51 21 11 -1.83 38 0 0 51 26 5 16 52 14.1 13 202 -24 51 9 56 51 42 25 50 56 48 51 55 59 -1.83 39 0 0 52 0 59 16 52 16.2 12 203 -25 51 44 39 52 17 32 51 31 22 52 31 16 -1.83 40 0 0 52 36 22 16 52 18.2 12 204 -25 52 19 49 52 53 7 52 6 23 53 7 1 -1.84 41 0 0 53 12 10 16 52 20.1 11 205 -26 52 55 25 53 29 8 52 41 49 53 43 14 -1.84 42 0 0 53 48 24 16 52 21.8 10 206 -26 53 31 26 54 5 35 53 17 40 54 19 51 -1.84 43 0 0 54 25 1 16 52 23.3 9 207 -26 54 7 50 54 42 25 53 53 53 54 56 54 -1.85 44 0 0 55 2 0 16 52 24.8 8 208 -27 54 44 35 55 19 38 54 30 28 55 34 18 -1.85 45 0 0 55 39 19 16 52 26.1 8 208 -27 55 21 41 55 57 12 55 7 23 56 12 4 -1.86 46 0 0 56 16 57 16 52 27.3 7 209 -27 55 59 5 56 35 5 55 44 36 56 50 10 -1.86 47 0 0 56 54 53 16 52 28.3 6 210 -28 56 36 46 57 13 15 56 22 6 57 28 33 -1.87 48 0 0 57 33 3 16 52 29.2 5 211 -28 57 14 42 57 51 41 56 59 50 58 7 13 -1.88 49 0 0 58 11 28 16 52 29.9 4 212 -28 57 52 52 58 30 22 57 37 48 58 46 6 -1.90 50 0 0 58 50 4 16 52 30.5 3 213 -28 58 31 13 59 9 14 58 15 57 59 25 12 -1.92 51 0 0 59 28 50 16 52 31.0 3 214 -28 59 9 43 59 48 16 58 54 15 60 4 29 -1.95 52 0 0 60 7 44 16 52 31.4 2 215 -29 59 48 21 60 27 26 59 32 40 60 43 53 -2.02 53 0 0 60 46 43 16 52 31.6 1 215 -29 60 27 4 61 6 42 60 11 11 61 23 24 -2.18 54 0 0 61 25 45 16 52 31.7 0 216 -29 61 5 50 .. .. .. 60 49 44 .. .. .. -3.51 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6891-00383-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 54 29.5850 DE: -22 40 53.762 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 54 29.5849 DE: -22 40 53.762 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.8 * B mag [mag]: 10.7 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3128) Obruchev asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.52840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Apr 24 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): 0.026", 0.005", 81.364° remarks: * orbital elements for (3128)Obruchev : Mean anomaly = 20.1780994829 deg Arg. of pericenter = 188.0455781187 deg Long. of node = 102.3456770473 deg Inclination = 2.9380279045 deg Eccentricity = 0.1577390848 Semimajor axis = 3.1145846205 AU Perihelion dist = 2.6232928930 AU Mag: H = 12.29, G = 0.15 Epoch of elements : MJD 60605.70142687 TDT (2024 Oct 22.7014) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.04,2024,10,22,16.834255,-0.164924,0.858644,11.443779,2.195649,0.005645,0.001097,0.000000,0.000000 14.8679,-22.6177,-76.42,-11.39,False TYC 6891-00383-1,19.90821807,-22.6816005,10.67,9.77,9.28,0.2,0,,19.93273133,-22.6176932,7.72,7.76,0,0,0 3128,Obruchev,17.49,21.385,2.5284,0,0,2.875,7.64,,1.6,0 0,20.0523,2024,10,22,188.0456,102.3457,2.9380,0.15774,3.11458,2.62329,12.29,5.0,0.15 1.411,0.0257,0.0047,81,0.0048,Known errors,1.01,0,-1,-1 20241022_0383-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org