IOTA/IOTA-ES occultation update for (206) Hersilia / UCAC4 362-078184 event on 2023 Jul 14, 00:23 UT Visible from Africa, South America Summary ------- On 2023 Jul 14 UT, the 99 km diameter asteroid (206) Hersilia will occult a 11.8 mag star in the constellation Ophiuchus for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.80 mag to 13.36 mag (the magnitude of the asteroid) for at most 15.720 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 Jul 14, 00:05 - 2023 Jul 14, 00:40 * geocentric midpoint of event [JD]: 2460139.51606304 * magnitude of target star: 11.79 * magnitude drop [mag]: 1.80 * estimated maximum duration [s]: 15.720 * Moon: 13 % sunlit, 172° distance * Sun: 141° distance * rough path description: Africa, South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 100 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.005", 94°) * approx speed of asteroid's shadow [km/s]: 6.2993 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 362-078184 by 206 Hersilia on 2023 Jul 14 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 -140 0 0 - 2 2 57 0 39 53.0 0 108 37 .. .. .. - 2 31 25 .. .. .. - 2 36 42 .... -139 0 0 - 2 22 5 0 39 52.8 1 108 36 - 1 53 36 - 2 50 31 - 1 48 18 - 2 55 48 0.01 -138 0 0 - 2 40 59 0 39 52.3 2 108 35 - 2 12 32 - 3 9 24 - 2 7 15 - 3 14 40 -0.06 -137 0 0 - 2 59 40 0 39 51.4 3 108 34 - 2 31 15 - 3 28 2 - 2 25 57 - 3 33 19 -0.09 -136 0 0 - 3 18 6 0 39 50.1 4 108 33 - 2 49 43 - 3 46 26 - 2 44 26 - 3 51 42 -0.10 -135 0 0 - 3 36 17 0 39 48.6 5 107 32 - 3 7 56 - 4 4 36 - 3 2 40 - 4 9 52 -0.11 -134 0 0 - 3 54 14 0 39 46.7 6 107 31 - 3 25 55 - 4 22 31 - 3 20 39 - 4 27 46 -0.12 -133 0 0 - 4 11 55 0 39 44.5 7 107 30 - 3 43 38 - 4 40 10 - 3 38 23 - 4 45 25 -0.12 -132 0 0 - 4 29 22 0 39 41.9 8 107 29 - 4 1 7 - 4 57 34 - 3 55 51 - 5 2 49 -0.12 -131 0 0 - 4 46 32 0 39 39.1 9 107 28 - 4 18 19 - 5 14 43 - 4 13 4 - 5 19 57 -0.13 -130 0 0 - 5 3 27 0 39 35.9 10 107 27 - 4 35 16 - 5 31 36 - 4 30 1 - 5 36 50 -0.13 -129 0 0 - 5 20 6 0 39 32.5 12 107 26 - 4 51 57 - 5 48 13 - 4 46 43 - 5 53 26 -0.13 -128 0 0 - 5 36 28 0 39 28.7 13 107 25 - 5 8 22 - 6 4 33 - 5 3 8 - 6 9 47 -0.13 -127 0 0 - 5 52 35 0 39 24.6 14 107 24 - 5 24 30 - 6 20 38 - 5 19 16 - 6 25 50 -0.13 -126 0 0 - 6 8 24 0 39 20.2 15 107 23 - 5 40 21 - 6 36 25 - 5 35 8 - 6 41 38 -0.13 -125 0 0 - 6 23 57 0 39 15.6 16 107 22 - 5 55 56 - 6 51 56 - 5 50 43 - 6 57 8 -0.13 -124 0 0 - 6 39 13 0 39 10.6 17 107 21 - 6 11 14 - 7 7 10 - 6 6 1 - 7 12 22 -0.13 -123 0 0 - 6 54 12 0 39 5.4 18 106 20 - 6 26 15 - 7 22 7 - 6 21 2 - 7 27 18 -0.13 -122 0 0 - 7 8 53 0 38 59.8 19 106 19 - 6 40 58 - 7 36 46 - 6 35 46 - 7 41 57 -0.13 -121 0 0 - 7 23 17 0 38 54.0 20 106 18 - 6 55 24 - 7 51 9 - 6 50 13 - 7 56 19 -0.13 -120 0 0 - 7 37 24 0 38 48.0 21 106 17 - 7 9 33 - 8 5 13 - 7 4 22 - 8 10 24 -0.13 -119 0 0 - 7 51 13 0 38 41.6 22 106 16 - 7 23 23 - 8 19 0 - 7 18 13 - 8 24 10 -0.13 -118 0 0 - 8 4 44 0 38 35.0 23 106 15 - 7 36 57 - 8 32 30 - 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Uncertainty in time = +/- 4 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 362-078184 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 47 01.8232 DE: -17 39 28.005 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 47 01.8231 DE: -17 39 28.005 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (206) Hersilia asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.069 distance from Earth [AU]: 1.98380 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 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): 0.018", 0.005", 94.202° remarks: * orbital elements for (206)Hersilia : Mean anomaly = 177.5635705178 deg Arg. of pericenter = 302.5916861100 deg Long. of node = 145.0324738087 deg Inclination = 3.7797872462 deg Eccentricity = 0.0396599193 Semimajor axis = 2.7404741020 AU Perihelion dist = 2.6317871202 AU Mag: H = 8.82, G = 0.15 Epoch of elements : MJD 60139.01604167 TDT (2023 Jul 14.0160) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Apr24,15.72,2023,7,14,0.385513,-0.019380,0.120964,-3.510551,-0.563634,0.003388,-0.000782,0.000001,0.000000 -45.3025,-17.7004,175.68,21.74,False UCAC4 362-078184,16.78383978,-17.6577792,0.00,11.79,0.00,0.0,0,,16.80673050,-17.7003758,1.80,0.00,0,0,0 206,Hersilia,13.36,99.0,1.9838,0,0,-1.088,-2.50,,5.2,0 0,177.3428,2023,7,13,302.5917,145.0325,3.7798,0.03966,2.74047,2.63179,8.84,5.0,0.15 1.093,0.0180,0.0050,94,0.0064,Known errors,-1.00,-1,-1,-1 20230714_078184,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org