IOTA/IOTA-ES occultation update for (12168) Polko / TYC 6802-00766-1 event on 2024 Oct 15, 23:57 UT Visible from Summary ------- On 2024 Oct 15 UT, the 11.678 km diameter asteroid (12168) Polko will occult a 11.4 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.25 mag to 18.69 mag (the magnitude of the asteroid) for at most 0.300 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 15, 23:54 - 2024 Oct 16, 00:00 * geocentric midpoint of event [JD]: 2460599.49827641 * magnitude of target star: 11.44 * magnitude drop [mag]: 7.25 * estimated maximum duration [s]: 0.300 * Moon: 97 % sunlit, 112° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 38.3287 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6802-00766-1 by 12168 Polko on 2024 Oct 15 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 135 0 0 2 2 52 23 54 44.8 1 117 46 1 59 20 2 6 25 1 56 21 2 9 23 .... 136 0 0 1 32 34 23 54 44.9 2 117 47 1 29 1 1 36 6 1 26 3 1 39 5 0.10 137 0 0 1 2 11 23 54 45.0 3 117 48 0 58 38 1 5 44 0 55 40 1 8 42 0.07 138 0 0 0 31 45 23 54 45.2 4 117 49 0 28 12 0 35 18 0 25 13 0 38 16 0.05 139 0 0 0 1 16 23 54 45.5 5 117 50 - 0 2 17 0 4 49 - 0 5 15 0 7 48 0.05 140 0 0 - 0 29 14 23 54 45.8 6 117 52 - 0 32 47 - 0 25 41 - 0 35 45 - 0 22 42 0.04 141 0 0 - 0 59 45 23 54 46.2 7 117 53 - 1 3 18 - 0 56 12 - 1 6 16 - 0 53 13 0.04 142 0 0 - 1 30 15 23 54 46.6 9 117 54 - 1 33 48 - 1 26 42 - 1 36 47 - 1 23 44 0.03 143 0 0 - 2 0 45 23 54 47.2 10 117 55 - 2 4 18 - 1 57 12 - 2 7 16 - 1 54 14 0.03 144 0 0 - 2 31 13 23 54 47.7 11 117 56 - 2 34 46 - 2 27 40 - 2 37 44 - 2 24 42 0.03 145 0 0 - 3 1 38 23 54 48.4 12 117 57 - 3 5 11 - 2 58 5 - 3 8 9 - 2 55 7 0.03 146 0 0 - 3 32 0 23 54 49.1 13 116 58 - 3 35 33 - 3 28 27 - 3 38 31 - 3 25 29 0.03 147 0 0 - 4 2 17 23 54 49.9 14 116 59 - 4 5 50 - 3 58 45 - 4 8 48 - 3 55 46 0.03 148 0 0 - 4 32 30 23 54 50.7 15 116 60 - 4 36 2 - 4 28 57 - 4 39 0 - 4 25 59 0.03 149 0 0 - 5 2 36 23 54 51.6 16 116 61 - 5 6 8 - 4 59 3 - 5 9 6 - 4 56 5 0.03 150 0 0 - 5 32 35 23 54 52.5 18 116 62 - 5 36 8 - 5 29 3 - 5 39 5 - 5 26 5 0.02 151 0 0 - 6 2 27 23 54 53.5 19 116 63 - 6 5 59 - 5 58 55 - 6 8 57 - 5 55 57 0.02 152 0 0 - 6 32 10 23 54 54.6 20 116 64 - 6 35 42 - 6 28 38 - 6 38 40 - 6 25 41 0.02 153 0 0 - 7 1 44 23 54 55.7 21 116 65 - 7 5 16 - 6 58 13 - 7 8 14 - 6 55 15 0.02 154 0 0 - 7 31 8 23 54 56.9 22 116 67 - 7 34 40 - 7 27 37 - 7 37 37 - 7 24 40 0.02 155 0 0 - 8 0 22 23 54 58.1 23 116 68 - 8 3 53 - 7 56 50 - 8 6 50 - 7 53 53 0.02 156 0 0 - 8 29 24 23 54 59.4 24 115 69 - 8 32 55 - 8 25 52 - 8 35 52 - 8 22 56 0.02 157 0 0 - 8 58 13 23 55 0.7 25 115 70 - 9 1 44 - 8 54 42 - 9 4 41 - 8 51 46 0.02 158 0 0 - 9 26 50 23 55 2.1 26 115 71 - 9 30 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15 13 0 0 2.3 + 25 247 -21 -14 18 40 -14 11 46 -14 21 33 -14 8 52 0.02 - 68 0 0 -13 49 37 0 0 3.6 + 24 247 -22 -13 53 5 -13 46 9 -13 55 58 -13 43 16 0.02 - 67 0 0 -13 23 42 0 0 4.8 + 23 246 -23 -13 27 10 -13 20 14 -13 30 4 -13 17 20 0.02 - 66 0 0 -12 57 29 0 0 6.0 + 22 246 -24 -13 0 57 -12 54 0 -13 3 51 -12 51 6 0.02 - 65 0 0 -12 30 57 0 0 7.1 + 20 246 -25 -12 34 25 -12 27 28 -12 37 20 -12 24 33 0.02 - 64 0 0 -12 4 7 0 0 8.1 + 19 246 -26 -12 7 36 -12 0 38 -12 10 31 -11 57 44 0.02 - 63 0 0 -11 37 1 0 0 9.2 + 18 246 -28 -11 40 30 -11 33 32 -11 43 25 -11 30 36 0.02 - 62 0 0 -11 9 38 0 0 10.1 + 17 245 -29 -11 13 8 -11 6 9 -11 16 3 -11 3 13 0.03 - 61 0 0 -10 41 59 0 0 11.0 + 16 245 -30 -10 45 29 -10 38 29 -10 48 25 -10 35 34 0.03 - 60 0 0 -10 14 5 0 0 11.9 + 15 245 -31 -10 17 35 -10 10 35 -10 20 31 -10 7 39 0.03 - 59 0 0 - 9 45 57 0 0 12.7 + 14 245 -32 - 9 49 27 - 9 42 26 - 9 52 23 - 9 39 30 0.03 - 58 0 0 - 9 17 34 0 0 13.4 + 13 245 -33 - 9 21 5 - 9 14 3 - 9 24 1 - 9 11 7 0.03 - 57 0 0 - 8 48 58 0 0 14.1 + 12 245 -34 - 8 52 29 - 8 45 27 - 8 55 25 - 8 42 30 0.03 - 56 0 0 - 8 20 9 0 0 14.7 + 11 244 -35 - 8 23 41 - 8 16 38 - 8 26 37 - 8 13 41 0.03 - 55 0 0 - 7 51 9 0 0 15.3 + 10 244 -36 - 7 54 40 - 7 47 37 - 7 57 37 - 7 44 40 0.03 - 54 0 0 - 7 21 57 0 0 15.8 + 8 244 -37 - 7 25 29 - 7 18 26 - 7 28 26 - 7 15 28 0.04 - 53 0 0 - 6 52 35 0 0 16.2 + 7 244 -38 - 6 56 7 - 6 49 3 - 6 59 4 - 6 46 6 0.04 - 52 0 0 - 6 23 4 0 0 16.6 + 6 244 -39 - 6 26 36 - 6 19 32 - 6 29 33 - 6 16 34 0.04 - 51 0 0 - 5 53 23 0 0 16.9 + 5 244 -41 - 5 56 55 - 5 49 51 - 5 59 53 - 5 46 53 0.05 - 50 0 0 - 5 23 34 0 0 17.2 + 4 244 -42 - 5 27 7 - 5 20 2 - 5 30 4 - 5 17 4 0.06 - 49 0 0 - 4 53 38 0 0 17.4 + 3 244 -43 - 4 57 11 - 4 50 6 - 5 0 9 - 4 47 8 0.07 - 48 0 0 - 4 23 36 0 0 17.5 + 2 243 -44 - 4 27 8 - 4 20 3 - 4 30 6 - 4 17 5 0.11 - 47 0 0 - 3 53 27 0 0 17.6 + 1 243 -45 - 3 57 0 - 3 49 55 - 3 59 58 - 3 46 57 0.27 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6802-00766-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 25 58.4092 DE: -26 30 57.368 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 25 58.4091 DE: -26 30 57.368 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12168) Polko asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.42550 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#39 date of fit: 2023 Apr 25 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): 0.016", 0.002", 95.718° remarks: * orbital elements for (12168)Polko : Mean anomaly = 313.0126416878 deg Arg. of pericenter = 18.3509456386 deg Long. of node = 300.8986824586 deg Inclination = 9.5251985203 deg Eccentricity = 0.0970176917 Semimajor axis = 3.0147824619 AU Perihelion dist = 2.7222952265 AU Mag: H = 12.94, G = 0.15 Epoch of elements : MJD 60598.99827638 TDT (2024 Oct 15.9983) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#392023Apr25,0.30,2024,10,15,23.958634,-0.001312,-0.011846,21.597608,-1.251009,0.004048,-0.000980,-0.000001,0.000000 -137.5134,-26.5726,177.01,-8.99,False TYC 6802-00766-1,16.43289150,-26.5159357,11.85,11.44,11.22,0.0,0,,16.45789577,-26.5725899,7.25,7.02,0,0,0 12168,Polko,18.69,11.678,3.4255,0,0,4.133,-3.21,,2.6,0 0,312.8247,2024,10,15,18.3509,300.8987,9.5252,0.09702,3.01478,2.72230,12.93,5.0,0.15 1.419,0.0163,0.0019,96,0.0020,Known errors,1.01,0,-1,-1 20241015_0766-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org