IOTA/IOTA-ES occultation update for (532) Herculina / UCAC4 544-010820 event on 2023 Mar 27, 01:13 UT Visible from N Canada Summary ------- On 2023 Mar 27 UT, the 195.3 km diameter asteroid (532) Herculina will occult a 11.0 mag star in the constellation Taurus for observers along a path across N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.94 mag to 11.36 mag (the magnitude of the asteroid) for at most 7.190 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 Mar 27, 01:10 - 2023 Mar 27, 01:16 * geocentric midpoint of event [JD]: 2460030.55104029 * magnitude of target star: 11.02 * magnitude drop [mag]: 0.94 * estimated maximum duration [s]: 7.190 * Moon: 30 % sunlit, 7° distance * Sun: 67° distance * rough path description: N Canada The occultation path -------------------- * approximate projected width [km]: 231 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.009", 65°) * approx speed of asteroid's shadow [km/s]: 27.1560 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 544-010820 by 532 Herculina on 2023 Mar 27 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 137 0 0 11 24 35 1 10 11.7 0 71 62 .. .. .. 12 31 40 .. .. .. 12 45 25 .... 138 0 0 11 45 19 1 10 11.7 1 71 63 10 38 55 12 52 36 10 25 31 13 6 24 -0.45 139 0 0 12 6 34 1 10 11.9 2 71 64 10 59 58 13 14 4 10 46 33 13 27 54 -0.55 140 0 0 12 28 20 1 10 12.1 3 72 64 11 21 32 13 36 2 11 8 4 13 49 54 -0.58 141 0 0 12 50 36 1 10 12.4 4 72 65 11 43 36 13 58 30 11 30 5 14 12 25 -0.60 142 0 0 13 13 22 1 10 12.9 5 72 66 12 6 10 14 21 29 11 52 37 14 35 26 -0.61 143 0 0 13 36 37 1 10 13.4 6 72 67 12 29 12 14 44 57 12 15 37 14 58 57 -0.61 144 0 0 14 0 21 1 10 14.0 7 73 67 12 52 44 15 8 55 12 39 6 15 22 58 -0.62 145 0 0 14 24 34 1 10 14.7 8 73 68 13 16 45 15 33 21 13 3 4 15 47 27 -0.62 146 0 0 14 49 16 1 10 15.5 9 73 69 13 41 13 15 58 16 13 27 30 16 12 24 -0.62 147 0 0 15 14 25 1 10 16.4 10 73 69 14 6 10 16 23 39 13 52 24 16 37 50 -0.63 148 0 0 15 40 2 1 10 17.3 12 74 70 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23 2 11 20 24 7 23 17 2 -0.64 162 0 0 22 20 39 1 10 40.7 26 79 70 21 9 8 23 33 16 20 54 43 23 48 10 -0.64 163 0 0 22 51 47 1 10 43.0 27 80 70 21 40 3 24 4 36 21 25 36 24 19 33 -0.64 164 0 0 23 23 10 1 10 45.4 28 80 69 22 11 15 24 36 12 21 56 46 24 51 12 -0.64 165 0 0 23 54 48 1 10 47.9 29 81 69 22 42 41 25 8 3 22 28 9 25 23 5 -0.64 166 0 0 24 26 40 1 10 50.4 30 82 68 23 14 21 25 40 6 22 59 47 25 55 11 -0.64 167 0 0 24 58 44 1 10 53.1 31 82 67 23 46 14 26 12 22 23 31 38 26 27 29 -0.64 168 0 0 25 31 0 1 10 55.8 32 83 67 24 18 19 26 44 49 24 3 41 26 59 58 -0.64 169 0 0 26 3 26 1 10 58.5 33 84 66 24 50 34 27 17 27 24 35 54 27 32 38 -0.64 170 0 0 26 36 1 1 11 1.4 34 84 65 25 23 0 27 50 13 25 8 18 28 5 26 -0.64 171 0 0 27 8 45 1 11 4.3 35 85 64 25 55 34 28 23 7 25 40 50 28 38 23 -0.64 172 0 0 27 41 36 1 11 7.2 36 86 64 26 28 15 28 56 8 26 13 29 29 11 26 -0.64 173 0 0 28 14 33 1 11 10.3 37 87 63 27 1 3 29 29 14 26 46 16 29 44 34 -0.64 174 0 0 28 47 35 1 11 13.3 38 88 62 27 33 57 30 2 25 27 19 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-0.90 - 19 0 0 49 43 33 1 16 47.6 1 298 -38 48 32 20 50 55 52 48 17 59 51 10 41 -1.11 - 18 0 0 49 21 47 1 16 47.7 0 299 -38 .. .. .. 50 34 17 .. .. .. 50 49 10 -3.74 - 17 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 50 27 13 .... Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 544-010820 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 49 10.6929 DE: +18 38 02.095 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 49 10.6928 DE: +18 38 02.095 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (532) Herculina asteroid class: ShapeModel approx. diameter [km]: 195 approx. diameter ["]: 0.092 distance from Earth [AU]: 2.91190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#122 date of fit: 2023 Feb 07 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", 0.009", 64.65° remarks: * orbital elements for (532)Herculina : Mean anomaly = 289.0786024356 deg Arg. of pericenter = 76.7345862753 deg Long. of node = 107.4205213147 deg Inclination = 16.2986581284 deg Eccentricity = 0.1795246145 Semimajor axis = 2.7692871550 AU Perihelion dist = 2.2721319462 AU Mag: H = 5.91, G = 0.26 Epoch of elements : MJD 60030.05118056 TDT (2023 Mar 27.0512) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1222023Feb07,7.19,2023,3,27,1.224967,-0.187508,0.502163,14.361585,5.355448,0.005286,0.000483,-0.000001,0.000000 -129.9651,18.6741,163.02,2.43,False UCAC4 544-010820,4.81963696,18.6339153,0.00,11.02,0.00,0.0,0,,4.84190244,18.6740526,0.94,0.00,0,0,0 532,Herculina,11.36,195.3,2.9119,0,0,3.053,16.17,,11.0,0 0,288.8538,2023,3,26,76.7346,107.4205,16.2987,0.17952,2.76929,2.27213,5.89,5.0,0.15 1.102,0.0157,0.0093,65,0.0094,Known errors,-1.00,-1,-1,-1 20230327_010820,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org