IOTA/IOTA-ES occultation update for (206) Hersilia / TYC 6238-00084-1 event on 2023 May 26, 06:58 UT Visible from misses Earth Summary ------- On 2023 May 26 UT, the 99 km diameter asteroid (206) Hersilia will occult a 10.6 mag star in the constellation Ophiuchus for observers along a path across misses Earth. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.49 mag to 12.95 mag (the magnitude of the asteroid) for at most 9.150 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 May 26, 06:55 - 2023 May 26, 07:01 * geocentric midpoint of event [JD]: 2460090.79042979 * magnitude of target star: 10.58 * magnitude drop [mag]: 2.49 * estimated maximum duration [s]: 9.150 * Moon: 38 % sunlit, 121° distance * Sun: 162° distance * rough path description: misses Earth The occultation path -------------------- * approximate projected width [km]: 444 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.005", 92°) * approx speed of asteroid's shadow [km/s]: 10.8168 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6238-00084-1 by 206 Hersilia on 2023 May 26 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 -116 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 69 54 0 .... -115 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 69 49 28 .. .. .. 69 14 56 .... -114 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 69 10 17 .. .. .. 68 37 49 .... -113 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 68 33 8 .. .. .. 68 2 25 .... -112 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 67 57 47 .. .. .. 67 28 32 .... -111 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 67 24 1 .. .. .. 66 56 3 .... -110 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 66 51 42 .. .. .. 66 24 51 .... -109 0 0 70 8 47 7 0 16.3 1 159 1 .. .. .. 66 20 43 .. .. .. 65 54 51 .... -108 0 0 69 25 31 7 0 15.5 2 160 0 .. .. .. 65 50 58 .. .. .. 65 25 59 -3.19 -107 0 0 68 45 49 7 0 14.3 2 161 0 .. .. .. 65 22 24 .. .. .. 64 58 11 -3.73 -106 0 0 68 8 59 7 0 12.7 3 162 -1 .. .. .. 64 54 54 .. .. .. 64 31 24 -3.99 -105 0 0 67 34 32 7 0 10.8 4 163 -1 .. .. .. 64 28 28 .. .. .. 64 5 36 -4.15 -104 0 0 67 2 9 7 0 8.5 4 164 -2 .. .. .. 64 3 2 .. .. .. 63 40 45 -4.25 -103 0 0 66 31 34 7 0 6.0 5 165 -2 .. .. .. 63 38 34 .. .. .. 63 16 49 -4.32 -102 0 0 66 2 37 7 0 3.3 6 166 -3 70 41 10 63 15 1 .. .. .. 62 53 46 -4.37 -101 0 0 65 35 9 7 0 0.3 6 167 -3 69 50 29 62 52 24 70 58 16 62 31 34 -4.42 -100 0 0 65 9 4 6 59 57.1 7 167 -4 69 7 12 62 30 38 70 3 44 62 10 14 -4.45 - 99 0 0 64 44 15 6 59 53.8 7 168 -4 68 28 53 62 9 45 69 18 34 61 49 43 -4.47 - 98 0 0 64 20 40 6 59 50.2 8 169 -4 67 54 17 61 49 41 68 39 14 61 30 1 -4.49 - 97 0 0 63 58 12 6 59 46.5 8 170 -5 67 22 38 61 30 28 68 4 4 61 11 6 -4.51 - 96 0 0 63 36 51 6 59 42.6 8 171 -5 66 53 26 61 12 3 67 32 10 60 52 59 -4.52 - 95 0 0 63 16 32 6 59 38.6 9 172 -5 66 26 22 60 54 25 67 2 55 60 35 39 -4.54 - 94 0 0 62 57 14 6 59 34.4 9 173 -6 66 1 11 60 37 35 66 35 56 60 19 4 -4.55 - 93 0 0 62 38 55 6 59 30.1 10 174 -6 65 37 41 60 21 31 66 10 56 60 3 14 -4.55 - 92 0 0 62 21 33 6 59 25.7 10 175 -6 65 15 45 60 6 13 65 47 42 59 48 10 -4.56 - 91 0 0 62 5 6 6 59 21.2 10 176 -6 64 55 14 59 51 41 65 26 6 59 33 50 -4.57 - 90 0 0 61 49 34 6 59 16.6 10 177 -6 64 36 4 59 37 54 65 5 58 59 20 14 -4.57 - 89 0 0 61 34 55 6 59 11.9 11 178 -6 64 18 9 59 24 51 64 47 14 59 7 22 -4.58 - 88 0 0 61 21 8 6 59 7.1 11 179 -6 64 1 27 59 12 33 64 29 48 58 55 13 -4.58 - 87 0 0 61 8 12 6 59 2.2 11 180 -7 63 45 54 59 0 59 64 13 36 58 43 48 -4.59 - 86 0 0 60 56 7 6 58 57.3 11 181 -7 63 31 27 58 50 8 63 58 35 58 33 6 -4.59 - 85 0 0 60 44 52 6 58 52.3 12 182 -7 63 18 5 58 40 1 63 44 43 58 23 6 -4.60 - 84 0 0 60 34 26 6 58 47.3 12 183 -7 63 5 45 58 30 37 63 31 56 58 13 49 -4.60 - 83 0 0 60 24 49 6 58 42.3 12 184 -7 62 54 26 58 21 56 63 20 13 58 5 14 -4.60 - 82 0 0 60 16 1 6 58 37.2 12 185 -7 62 44 6 58 13 57 63 9 32 57 57 22 -4.61 - 81 0 0 60 8 0 6 58 32.0 12 185 -7 62 34 44 58 6 42 62 59 52 57 50 11 -4.61 - 80 0 0 60 0 47 6 58 26.9 12 186 -6 62 26 19 58 0 9 62 51 11 57 43 43 -4.61 - 79 0 0 59 54 21 6 58 21.8 12 187 -6 62 18 51 57 54 18 62 43 29 57 37 56 -4.62 - 78 0 0 59 48 42 6 58 16.6 12 188 -6 62 12 18 57 49 9 62 36 44 57 32 51 -4.62 - 77 0 0 59 43 49 6 58 11.4 12 189 -6 62 6 40 57 44 43 62 30 56 57 28 28 -4.62 - 76 0 0 59 39 43 6 58 6.3 12 190 -6 62 1 57 57 40 59 62 26 5 57 24 46 -4.62 - 75 0 0 59 36 24 6 58 1.2 12 191 -6 61 58 8 57 37 57 62 22 9 57 21 46 -4.63 - 74 0 0 59 33 51 6 57 56.1 12 192 -6 61 55 12 57 35 37 62 19 9 57 19 28 -4.63 - 73 0 0 59 32 4 6 57 51.0 12 193 -5 61 53 10 57 33 59 62 17 3 57 17 51 -4.64 - 72 0 0 59 31 4 6 57 46.0 12 194 -5 61 52 2 57 33 3 62 15 53 57 16 55 -4.64 - 71 0 0 59 30 50 6 57 41.0 12 195 -5 61 51 47 57 32 50 62 15 38 57 16 42 -4.64 - 70 0 0 59 31 22 6 57 36.1 12 196 -5 61 52 25 57 33 18 62 16 17 57 17 10 -4.65 - 69 0 0 59 32 40 6 57 31.2 11 197 -4 61 53 57 57 34 28 62 17 52 57 18 19 -4.65 - 68 0 0 59 34 45 6 57 26.4 11 198 -4 61 56 22 57 36 21 62 20 21 57 20 10 -4.66 - 67 0 0 59 37 36 6 57 21.7 11 199 -4 61 59 41 57 38 55 62 23 47 57 22 43 -4.66 - 66 0 0 59 41 13 6 57 17.1 11 200 -3 62 3 54 57 42 12 62 28 8 57 25 57 -4.67 - 65 0 0 59 45 37 6 57 12.5 11 201 -3 62 9 2 57 46 11 62 33 25 57 29 53 -4.67 - 64 0 0 59 50 49 6 57 8.1 10 202 -3 62 15 5 57 50 53 62 39 39 57 34 32 -4.68 - 63 0 0 59 56 47 6 57 3.7 10 202 -2 62 22 3 57 56 18 62 46 51 57 39 53 -4.69 - 62 0 0 60 3 34 6 56 59.4 10 203 -2 62 29 59 58 2 25 62 55 2 57 45 56 -4.69 - 61 0 0 60 11 8 6 56 55.3 10 204 -1 62 38 52 58 9 15 63 4 13 57 52 40 -4.70 - 60 0 0 60 19 31 6 56 51.3 9 205 -1 62 48 43 58 16 48 63 14 24 58 0 8 -4.71 - 59 0 0 60 28 43 6 56 47.4 9 206 0 62 59 35 58 25 5 63 25 39 58 8 18 -4.71 - 58 0 0 60 38 43 6 56 43.7 8 207 0 63 11 27 58 34 5 63 37 57 58 17 12 -4.72 - 57 0 0 60 49 34 6 56 40.1 8 208 0 63 24 21 58 43 49 63 51 21 58 26 48 -4.73 - 56 0 0 61 1 15 6 56 36.7 8 209 1 63 38 21 58 54 17 64 5 53 58 37 8 -4.74 - 55 0 0 61 13 47 6 56 33.4 7 210 1 63 53 26 59 5 29 64 21 36 58 48 11 -4.75 - 54 0 0 61 27 11 6 56 30.3 7 211 2 64 9 41 59 17 26 64 38 34 58 59 58 -4.76 - 53 0 0 61 41 28 6 56 27.3 6 212 2 64 27 9 59 30 8 64 56 50 59 12 30 -4.77 - 52 0 0 61 56 39 6 56 24.6 6 212 3 64 45 53 59 43 35 65 16 29 59 25 46 -4.79 - 51 0 0 62 12 45 6 56 22.0 5 213 3 65 5 57 59 57 48 65 37 35 59 39 47 -4.81 - 50 0 0 62 29 47 6 56 19.7 5 214 4 65 27 25 60 12 48 66 0 18 59 54 33 -4.82 - 49 0 0 62 47 46 6 56 17.5 4 215 5 65 50 27 60 28 34 66 24 46 60 10 6 -4.85 - 48 0 0 63 6 45 6 56 15.6 4 216 5 66 15 8 60 45 8 66 51 10 60 26 24 -4.88 - 47 0 0 63 26 45 6 56 13.9 3 217 6 66 41 41 61 2 30 67 19 47 60 43 29 -4.91 - 46 0 0 63 47 50 6 56 12.4 3 218 6 67 10 18 61 20 40 .. .. .. 61 1 22 -4.96 - 45 0 0 64 10 0 6 56 11.2 2 219 7 .. .. .. 61 39 40 .. .. .. 61 20 2 -5.04 - 44 0 0 64 33 20 6 56 10.3 2 220 7 .. .. .. 61 59 30 .. .. .. 61 39 32 -5.16 - 43 0 0 64 57 53 6 56 9.6 1 221 8 .. .. .. 62 20 13 .. .. .. 61 59 52 -5.42 - 42 0 0 65 23 44 6 56 9.3 1 221 8 .. .. .. 62 41 48 .. .. .. 62 21 2 -6.28 - 41 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 63 4 16 .. .. .. 62 43 4 .... - 40 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 63 27 40 .. .. .. 63 5 59 .... - 39 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 63 52 1 .. .. .. 63 29 49 .... - 38 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 64 17 20 .. .. .. 63 54 33 .... Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 6238-00084-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 25 07.1646 DE: -17 47 10.624 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 25 07.1646 DE: -17 47 10.624 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (206) Hersilia asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.073 distance from Earth [AU]: 1.86590 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): 0.019", 0.005", 91.819° remarks: * orbital elements for (206)Hersilia : Mean anomaly = 166.9672867224 deg Arg. of pericenter = 302.6016929246 deg Long. of node = 145.0332377789 deg Inclination = 3.7797629798 deg Eccentricity = 0.0396098519 Semimajor axis = 2.7406075792 AU Perihelion dist = 2.6320525188 AU Mag: H = 8.82, G = 0.15 Epoch of elements : MJD 60090.29041667 TDT (2023 May 26.2904) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Apr24,9.15,2023,5,26,6.970315,0.080708,0.971473,-6.084352,0.505455,-0.001658,-0.000412,0.000001,0.000000 -86.5251,-17.8080,74.71,21.10,False TYC 6238-00084-1,17.41865682,-17.7862846,0.00,10.58,0.00,0.0,0,,17.44157687,-17.8079882,2.49,0.00,0,0,0 206,Hersilia,12.95,99.0,1.8659,0,0,-2.008,2.38,,5.2,0 0,166.9042,2023,5,26,302.6017,145.0332,3.7798,0.03961,2.74061,2.63205,8.84,5.0,0.15 1.074,0.0193,0.0053,92,0.0054,Known errors,-1.00,-1,-1,-1 20230526_0084-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org