IOTA/IOTA-ES occultation update for (135) Hertha / UCAC4 568-041488 event on 2021 Feb 08, 06:31 UT Visible from Canada Summary ------- On 2021 Feb 08 UT, the 75.3 km diameter asteroid (135) Hertha will occult a 12.4 mag star in the constellation Gemini for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.85 mag to 12.55 mag (the magnitude of the asteroid) for at most 6.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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: 99 * date and approx. time of event: 2021 Feb 08, 06:23 - 2021 Feb 08, 06:39 * geocentric midpoint of event [JD]: 2459253.77196250 * magnitude of target star: 12.37 * magnitude drop [mag]: 0.85 * estimated maximum duration [s]: 6.5 * Moon: 14 % sunlit, 162° distance * Sun: 154° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.008", 101°) * approx speed of asteroid's shadow [km/s]: 11.5290 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 568-041488 by 135 Hertha on 2021 Feb 8 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 129 0 0 36 44 56 6 39 11.3 0 60 23 37 13 27 .. .. .. 37 22 11 .. .. .. .... 130 0 0 37 12 36 6 39 11.2 1 61 22 37 41 7 36 44 16 37 49 51 36 35 40 -0.56 131 0 0 37 40 7 6 39 10.9 2 61 21 38 8 38 37 11 47 38 17 22 37 3 10 -0.62 132 0 0 38 7 29 6 39 10.4 3 62 20 38 36 0 37 39 8 38 44 44 37 30 32 -0.64 133 0 0 38 34 40 6 39 9.8 4 63 20 39 3 12 38 6 20 39 11 56 37 57 43 -0.65 134 0 0 39 1 41 6 39 9.0 5 63 19 39 30 12 38 33 21 39 38 57 38 24 44 -0.66 135 0 0 39 28 31 6 39 8.1 5 64 18 39 57 2 39 0 11 40 5 46 38 51 34 -0.66 136 0 0 39 55 8 6 39 7.0 6 65 17 40 23 39 39 26 49 40 32 23 39 18 13 -0.66 137 0 0 40 21 33 6 39 5.8 7 65 16 40 50 3 39 53 14 40 58 47 39 44 38 -0.67 138 0 0 40 47 45 6 39 4.4 8 66 15 41 16 14 40 19 27 41 24 58 40 10 51 -0.67 139 0 0 41 13 43 6 39 2.8 9 67 14 41 42 11 40 45 26 41 50 54 40 36 50 -0.67 140 0 0 41 39 27 6 39 1.2 10 67 13 42 7 54 41 11 11 42 16 37 41 2 35 -0.67 141 0 0 42 4 56 6 38 59.4 11 68 13 42 33 22 41 36 41 42 42 4 41 28 6 -0.67 142 0 0 42 30 9 6 38 57.4 12 69 12 42 58 34 42 1 56 43 7 16 41 53 22 -0.67 143 0 0 42 55 7 6 38 55.4 12 69 11 43 23 30 42 26 55 43 32 12 42 18 21 -0.67 144 0 0 43 19 49 6 38 53.2 13 70 10 43 48 11 42 51 39 43 56 52 42 43 5 -0.67 145 0 0 43 44 14 6 38 50.9 14 71 9 44 12 34 43 16 6 44 21 15 43 7 33 -0.68 146 0 0 44 8 23 6 38 48.5 15 71 8 44 36 40 43 40 16 44 45 20 43 31 44 -0.68 147 0 0 44 32 13 6 38 45.9 16 72 8 45 0 29 44 4 9 45 9 9 43 55 37 -0.68 148 0 0 44 55 47 6 38 43.3 16 73 7 45 24 0 44 27 44 45 32 39 44 19 13 -0.68 149 0 0 45 19 2 6 38 40.6 17 74 6 45 47 13 44 51 2 45 55 51 44 42 31 -0.68 150 0 0 45 41 59 6 38 37.8 18 74 5 46 10 7 45 14 1 46 18 45 45 5 31 -0.68 151 0 0 46 4 37 6 38 34.8 19 75 4 46 32 43 45 36 42 46 41 20 45 28 13 -0.68 152 0 0 46 26 56 6 38 31.8 19 76 4 46 55 0 45 59 4 47 3 36 45 50 35 -0.68 153 0 0 46 48 57 6 38 28.7 20 77 3 47 16 58 46 21 7 47 25 32 46 12 39 -0.68 154 0 0 47 10 38 6 38 25.6 21 78 2 47 38 36 46 42 50 47 47 10 46 34 24 -0.68 155 0 0 47 31 59 6 38 22.3 22 78 1 47 59 55 47 4 15 48 8 28 46 55 49 -0.68 156 0 0 47 53 1 6 38 19.0 22 79 1 48 20 53 47 25 20 48 29 26 47 16 55 -0.68 157 0 0 48 13 43 6 38 15.6 23 80 0 48 41 32 47 46 5 48 50 4 47 37 41 -0.68 158 0 0 48 34 6 6 38 12.1 24 81 -1 49 1 52 48 6 30 49 10 22 47 58 8 -0.68 159 0 0 48 54 8 6 38 8.5 24 82 -2 49 21 50 48 26 36 49 30 20 48 18 14 -0.68 160 0 0 49 13 50 6 38 4.9 25 82 -2 49 41 29 48 46 21 49 49 57 48 38 0 -0.68 161 0 0 49 33 12 6 38 1.3 26 83 -3 50 0 48 49 5 46 50 9 15 48 57 26 -0.68 162 0 0 49 52 13 6 37 57.6 26 84 -4 50 19 46 49 24 51 50 28 12 49 16 32 -0.68 163 0 0 50 10 54 6 37 53.8 27 85 -4 50 38 23 49 43 36 50 46 48 49 35 18 -0.68 164 0 0 50 29 15 6 37 50.0 28 86 -5 50 56 41 50 2 0 51 5 4 49 53 43 -0.69 165 0 0 50 47 16 6 37 46.1 28 87 -6 51 14 37 50 20 4 51 23 0 50 11 48 -0.69 166 0 0 51 4 56 6 37 42.2 29 88 -7 51 32 14 50 37 48 51 40 35 50 29 33 -0.69 167 0 0 51 22 15 6 37 38.2 30 89 -7 51 49 30 50 55 11 51 57 50 50 46 57 -0.69 168 0 0 51 39 14 6 37 34.2 30 90 -8 52 6 25 51 12 14 52 14 45 51 4 1 -0.69 169 0 0 51 55 53 6 37 30.2 31 91 -8 52 23 0 51 28 56 52 31 19 51 20 45 -0.69 170 0 0 52 12 12 6 37 26.1 32 91 -9 52 39 15 51 45 18 52 47 32 51 37 8 -0.69 171 0 0 52 28 10 6 37 22.0 32 92 -10 52 55 10 52 1 20 53 3 26 51 53 11 -0.69 172 0 0 52 43 48 6 37 17.9 33 93 -10 53 10 44 52 17 2 53 18 59 52 8 54 -0.69 173 0 0 52 59 6 6 37 13.7 33 94 -11 53 25 58 52 32 24 53 34 12 52 24 17 -0.69 174 0 0 53 14 4 6 37 9.5 34 95 -12 53 40 53 52 47 26 53 49 5 52 39 20 -0.69 175 0 0 53 28 42 6 37 5.3 34 96 -12 53 55 27 53 2 7 54 3 38 52 54 3 -0.69 176 0 0 53 43 0 6 37 1.1 35 97 -13 54 9 41 53 16 29 54 17 51 53 8 25 -0.69 177 0 0 53 56 59 6 36 56.8 35 98 -14 54 23 36 53 30 31 54 31 45 53 22 28 -0.69 178 0 0 54 10 37 6 36 52.5 36 99 -14 54 37 11 53 44 13 54 45 18 53 36 12 -0.69 179 0 0 54 23 56 6 36 48.2 37 100 -15 54 50 26 53 57 36 54 58 33 53 49 35 -0.69 -180 0 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22 5 6 34 52.0 48 130 -28 58 47 17 57 57 1 58 55 0 57 49 24 -0.70 -154 0 0 58 27 21 6 34 47.4 48 132 -29 58 52 31 58 2 18 59 0 13 57 54 42 -0.70 -153 0 0 58 32 20 6 34 42.8 48 133 -29 58 57 28 58 7 19 59 5 9 57 59 43 -0.70 -152 0 0 58 37 2 6 34 38.2 49 134 -30 59 2 9 58 12 4 59 9 50 58 4 28 -0.70 -151 0 0 58 41 29 6 34 33.7 49 136 -30 59 6 33 58 16 32 59 14 14 58 8 57 -0.70 -150 0 0 58 45 39 6 34 29.1 49 137 -31 59 10 42 58 20 44 59 18 22 58 13 9 -0.70 -149 0 0 58 49 33 6 34 24.5 49 138 -31 59 14 35 58 24 39 59 22 14 58 17 5 -0.70 -148 0 0 58 53 12 6 34 19.9 50 140 -31 59 18 12 58 28 19 59 25 51 58 20 45 -0.70 -147 0 0 58 56 34 6 34 15.2 50 141 -32 59 21 33 58 31 43 59 29 12 58 24 9 -0.70 -146 0 0 58 59 41 6 34 10.6 50 142 -32 59 24 38 58 34 50 59 32 17 58 27 17 -0.70 -145 0 0 59 2 31 6 34 6.0 51 144 -33 59 27 28 58 37 42 59 35 6 58 30 10 -0.70 -144 0 0 59 5 6 6 34 1.3 51 145 -33 59 30 2 58 40 18 59 37 40 58 32 46 -0.70 -143 0 0 59 7 26 6 33 56.7 51 146 -34 59 32 21 58 42 39 59 39 58 58 35 6 -0.70 -142 0 0 59 9 30 6 33 52.0 51 148 -34 59 34 23 58 44 43 59 42 1 58 37 11 -0.70 -141 0 0 59 11 18 6 33 47.4 52 149 -34 59 36 11 58 46 32 59 43 48 58 39 0 -0.70 -140 0 0 59 12 50 6 33 42.7 52 151 -35 59 37 43 58 48 5 59 45 20 58 40 33 -0.70 -139 0 0 59 14 7 6 33 38.0 52 152 -35 59 38 59 58 49 22 59 46 36 58 41 51 -0.70 -138 0 0 59 15 9 6 33 33.3 52 154 -36 59 40 0 58 50 24 59 47 37 58 42 53 -0.70 -137 0 0 59 15 55 6 33 28.6 52 155 -36 59 40 46 58 51 11 59 48 23 58 43 39 -0.70 -136 0 0 59 16 25 6 33 23.9 53 156 -36 59 41 17 58 51 41 59 48 53 58 44 10 -0.70 -135 0 0 59 16 40 6 33 19.2 53 158 -37 59 41 32 58 51 56 59 49 8 58 44 25 -0.70 -134 0 0 59 16 40 6 33 14.5 53 159 -37 59 41 31 58 51 56 59 49 8 58 44 25 -0.70 -133 0 0 59 16 24 6 33 9.7 53 161 -38 59 41 15 58 51 40 59 48 52 58 44 9 -0.70 -132 0 0 59 15 53 6 33 5.0 53 162 -38 59 40 44 58 51 8 59 48 21 58 43 37 -0.70 -131 0 0 59 15 6 6 33 0.2 54 164 -38 59 39 58 58 50 21 59 47 35 58 42 50 -0.70 -130 0 0 59 14 4 6 32 55.5 54 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13 38 20 29 39 25 56 38 11 54 -0.70 - 41 0 0 38 22 4 6 25 2.8 24 282 -39 38 50 31 37 53 48 38 59 14 37 45 13 -0.70 - 40 0 0 37 55 12 6 24 58.6 23 283 -38 38 23 39 37 26 56 38 32 22 37 18 21 -0.70 - 39 0 0 37 28 12 6 24 54.6 22 284 -38 37 56 38 36 59 56 38 5 21 36 51 21 -0.70 - 38 0 0 37 1 2 6 24 50.7 21 284 -37 37 29 28 36 32 47 37 38 11 36 24 13 -0.70 - 37 0 0 36 33 45 6 24 46.9 20 285 -36 37 2 11 36 5 31 37 10 53 35 56 57 -0.70 - 36 0 0 36 6 21 6 24 43.2 19 286 -35 36 34 46 35 38 8 36 43 28 35 29 33 -0.71 - 35 0 0 35 38 51 6 24 39.7 18 286 -35 36 7 14 35 10 38 36 15 56 35 2 4 -0.71 - 34 0 0 35 11 15 6 24 36.4 17 287 -34 35 39 37 34 43 3 35 48 19 34 34 30 -0.71 - 33 0 0 34 43 34 6 24 33.1 17 287 -33 35 11 55 34 15 23 35 20 36 34 6 50 -0.71 - 32 0 0 34 15 48 6 24 30.1 16 288 -32 34 44 8 33 47 40 34 52 49 33 39 7 -0.71 - 31 0 0 33 48 0 6 24 27.1 15 289 -32 34 16 18 33 19 52 34 24 58 33 11 20 -0.71 - 30 0 0 33 20 8 6 24 24.4 14 289 -31 33 48 25 32 52 3 33 57 5 32 43 31 -0.72 - 29 0 0 32 52 15 6 24 21.8 13 290 -30 33 20 30 32 24 12 33 29 9 32 15 40 -0.72 - 28 0 0 32 24 21 6 24 19.4 12 290 -29 32 52 34 31 56 19 33 1 12 31 47 48 -0.72 - 27 0 0 31 56 27 6 24 17.1 11 291 -28 32 24 37 31 28 27 32 33 15 31 19 57 -0.73 - 26 0 0 31 28 33 6 24 15.0 10 292 -28 31 56 41 31 0 35 32 5 19 30 52 6 -0.73 - 25 0 0 31 0 40 6 24 13.1 9 292 -27 31 28 47 30 32 45 31 37 23 30 24 16 -0.74 - 24 0 0 30 32 50 6 24 11.4 8 293 -26 31 0 54 30 4 57 31 9 30 29 56 29 -0.74 - 23 0 0 30 5 3 6 24 9.9 7 293 -25 30 33 4 29 37 12 30 41 39 29 28 45 -0.75 - 22 0 0 29 37 20 6 24 8.5 6 294 -24 30 5 18 29 9 32 30 13 52 29 1 5 -0.76 - 21 0 0 29 9 41 6 24 7.4 5 294 -23 29 37 37 28 41 55 29 46 10 28 33 30 -0.78 - 20 0 0 28 42 8 6 24 6.4 4 295 -22 29 10 0 28 14 25 29 18 33 28 6 0 -0.80 - 19 0 0 28 14 41 6 24 5.7 3 295 -21 28 42 31 27 47 1 28 51 2 27 38 37 -0.84 - 18 0 0 27 47 21 6 24 5.1 2 296 -20 28 15 8 27 19 44 28 23 38 27 11 21 -0.92 - 17 0 0 27 20 9 6 24 4.8 1 296 -19 27 47 53 26 52 35 27 56 22 26 44 13 -1.12 - 16 0 0 26 53 6 6 24 4.6 0 296 -19 27 20 47 26 25 35 27 29 15 .. .. .. -3.33 Uncertainty in time = +/- 2 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: UCAC4 568-041488 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 43 26.6694 DE: +23 35 11.730 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 43 26.6693 DE: +23 35 11.730 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (135) Hertha asteroid class: approx. diameter [km]: 75 approx. diameter ["]: 0.053 distance from Earth [AU]: 1.95860 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 12 source of used astrometry: MPC, FASTT, TMO number of used observations: 2791 number of rejected observations: 23 time covered by the observations: 1960 Jan 21 - 2020 Oct 21 1 sigma uncertainty ellipse (major, minor, PA): 0.014", 0.008", 101.4° remarks: * orbital elements for (135)Hertha : Mean anomaly = 148.15086858 deg Arg. of pericenter = 340.24391709 deg Long. of node = 343.56655587 deg Inclination = 2.30396247 deg Eccentricity = 0.20691185 Semimajor axis = 2.42879290 AU Perihelion dist = 1.92624688 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 59253.27200000 TDT (2021 Feb 08.2720) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec12,6.5,2021,2,8,6.5271,0.05650,0.56869,-6.47624,0.63503,0.00250,-0.00066,0.00000,0.00000 -120.3158,23.5355,85.64,-14.90,False UCAC4 568-041488,7.72407482,23.5865917,0.00,12.37,0.00,0.0,0,,7.74525242,23.5355096 135,Hertha,12.55,75.3,1.9586,0,0,-2.113,2.85,,3.6 0,148.0800,2021,2,8,340.2439,343.5666,2.3040,0.20691,2.42879,1.92625,8.20,5.0,0.15 1.153,0.0140,0.0080,101,0.0081,Known errors 20210208_041488,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 01:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org