IOTA/IOTA-ES occultation update for (308) Polyxo / UCAC4-457-048817 event on 2023 Feb 02, 10:31 UT Visible from E USA, Canada Summary ------- On 2023 Feb 02 UT, the 136.5 km diameter asteroid (308) Polyxo will occult a 12.5 mag star in the constellation Leo for observers along a path across E USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.84 mag to 12.66 mag (the magnitude of the asteroid) for at most 20.650 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 Feb 02, 10:21 - 2023 Feb 02, 10:41 * geocentric midpoint of event [JD]: 2459977.93888130 * magnitude of target star: 12.50 * magnitude drop [mag]: 0.84 * estimated maximum duration [s]: 20.650 * Moon: 90 % sunlit, 74° distance * Sun: 142° distance * rough path description: E USA, Canada The occultation path -------------------- * approximate projected width [km]: 234 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.002", 110°) * approx speed of asteroid's shadow [km/s]: 6.6095 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-457-048817 by 308 Polyxo on 2023 Feb 2 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 Alt E. Longitude Latitude U.T. Alt Az Alt Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude .. .. .. .. .. .. .. .. .... .. .. .. - 30 30 47 25 31 37 ... .. .. .. .. .. - 31 10 6 25 29 30 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. - 33 4 37 25 45 12 ... .. .. .. .. .. - 33 30 5 25 42 46 ... .. .. .. .. .. .... - 26 56 21 26 23 38 10 22 37.3 0 271 22 - 34 54 21 25 57 50 ... .. .. .. .. .. - 35 14 41 25 55 17 ... .. .. .. .. .. .... - 31 41 58 26 40 12 10 22 42.8 5 269 18 - 36 24 45 26 10 2 ... .. .. .. .. .. - 36 42 13 26 7 25 ... .. .. .. .. .. -0.76 - 33 51 53 26 53 21 10 22 48.2 7 268 16 - 37 43 33 26 22 0 ... .. .. .. .. .. - 37 59 8 26 19 20 ... .. .. .. .. .. -1.19 - 35 32 7 27 5 52 10 22 53.7 8 267 15 - 38 54 23 26 33 48 - 29 21 25 27 34 23 - 39 8 36 26 31 5 - 27 55 13 27 35 32 -1.27 - 36 56 57 27 18 3 10 22 59.2 9 267 13 - 39 59 19 26 45 28 - 32 25 47 27 48 50 - 40 12 30 26 42 44 - 31 52 57 27 51 10 -1.30 - 38 11 55 27 30 1 10 23 4.7 10 266 12 - 40 59 40 26 57 4 - 34 23 45 28 1 50 - 41 12 1 26 54 18 - 33 59 26 28 4 21 -1.32 - 39 19 58 27 41 52 10 23 10.1 11 265 11 - 41 56 20 27 8 35 - 35 58 11 28 14 19 - 42 8 0 27 5 48 - 35 37 57 28 16 56 -1.33 - 40 22 43 27 53 35 10 23 15.6 12 265 11 - 42 49 56 27 20 3 - 37 19 24 28 26 31 - 43 1 2 27 17 15 - 37 1 39 28 29 12 -1.34 - 41 21 18 28 5 15 10 23 21.1 13 264 10 - 43 40 56 27 31 28 - 38 31 50 28 38 33 - 43 51 33 27 28 40 - 38 15 49 28 41 16 -1.34 - 42 16 29 28 16 50 10 23 26.5 14 264 9 - 44 29 43 27 42 51 - 39 37 55 28 50 27 - 44 39 55 27 40 2 - 39 23 10 28 53 12 -1.34 - 43 8 49 28 28 23 10 23 32.0 14 263 8 - 45 16 33 27 54 13 - 40 39 4 29 2 15 - 45 26 23 27 51 23 - 40 25 19 29 5 2 -1.35 - 43 58 43 28 39 53 10 23 37.5 15 263 7 - 46 1 41 28 5 33 - 41 36 22 29 13 59 - 46 11 12 28 2 42 - 41 23 25 29 16 48 -1.35 - 44 46 32 28 51 21 10 23 43.0 16 263 7 - 46 45 17 28 16 52 - 42 30 27 29 25 40 - 46 54 31 28 14 0 - 42 18 10 29 28 30 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19 15 -1.46 -148 46 34 78 14 23 10 40 40.5 12 152 -28 -145 36 4 76 2 17 -155 18 16 80 52 19 -145 24 36 75 52 9 -156 10 24 81 7 6 -1.47 -152 16 40 78 54 40 10 40 46.0 11 149 -28 -148 4 29 76 36 54 -161 44 39 81 42 6 -147 49 41 76 26 24 -163 6 37 81 57 57 -1.47 -156 30 8 79 36 48 10 40 51.4 10 144 -27 -150 52 42 77 12 43 -170 58 55 82 34 43 -150 33 33 77 1 49 -173 21 29 82 51 37 -1.49 -161 47 2 80 20 58 10 40 56.9 9 139 -26 -154 6 25 77 49 51 173 31 38 83 28 2 -153 41 30 77 38 30 168 13 40 83 44 26 -1.50 -168 44 11 81 7 10 10 41 2.4 7 132 -25 -157 54 8 78 28 24 ... .. .. .. .. .. -157 21 11 78 16 33 ... .. .. .. .. .. -1.53 -178 41 26 81 54 45 10 41 7.8 6 123 -24 -162 28 57 79 8 27 ... .. .. .. .. .. -161 44 27 78 56 4 ... .. .. .. .. .. -1.61 164 5 9 82 39 34 10 41 13.3 3 106 -22 -168 12 59 79 50 0 ... .. .. .. .. .. -167 10 43 79 37 2 ... .. .. .. .. .. -1.92 .. .. .. .. .. .. .. .. .... .. .. .. -175 48 8 80 32 43 ... .. .. .. .. .. -174 15 41 80 19 16 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. 173 6 18 81 15 14 ... .. .. .. .. .. 175 41 21 81 1 43 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. 149 53 14 81 46 51 ... .. .. .. .. .. 157 43 15 81 38 38 ... .. .. .. .. .. .... Uncertainty in time = +/- 5 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: UCAC4-457-048817 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 22 27.9460 DE: +01 22 59.172 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 22 27.9461 DE: +01 22 59.171 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.095 distance from Earth [AU]: 1.98140 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#109 date of fit: 2022 Nov 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): 0.022", 0.002", 109.59° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 227.5907266013 deg Arg. of pericenter = 112.4285664127 deg Long. of node = 181.5918419457 deg Inclination = 4.3627989696 deg Eccentricity = 0.0390989396 Semimajor axis = 2.7497992583 AU Perihelion dist = 2.6422850232 AU Mag: H = 8.18, G = 0.21 Epoch of elements : MJD 59977.43868056 TDT (2023 Feb 02.4387) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1092022Nov22,20.65,2023,2,2,10.533151,0.382907,0.716548,-3.289276,1.760063,-0.003247,0.001603,0.000001,0.000000 -119.4449,1.2559,25.41,-16.82,False UCAC4-457-048817,11.37442943,1.3831033,0.00,12.50,0.00,0.0,0,K,11.39431350,1.2558909,0.83,0.00,0,0,0 308,Polyxo,12.66,136.5,1.9814,0,0,-0.973,7.81,,7.6,0 0,227.4959,2023,2,2,112.4286,181.5918,4.3628,0.03910,2.74980,2.64229,8.18,5.0,0.15 1.041,0.0220,0.0022,110,0.0039,Known errors,-1.00,-1,-1,-1 20230202_048817,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org