IOTA/IOTA-ES occultation update for (420) Bertholda / UCAC4 542-032936 event on 2024 Dec 04, 15:41 UT Visible from Summary ------- On 2024 Dec 04 UT, the 137.364 km diameter asteroid (420) Bertholda will occult a 12.0 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.77 mag to 13.52 mag (the magnitude of the asteroid) for at most 12.750 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: 99 * date and approx. time of event: 2024 Dec 04, 15:35 - 2024 Dec 04, 15:46 * geocentric midpoint of event [JD]: 2460649.15368117 * magnitude of target star: 11.99 * magnitude drop [mag]: 1.77 * estimated maximum duration [s]: 12.750 * Moon: 12 % sunlit, 165° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 261 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.031, +/- 0.019) * 1 sigma uncertainty ellipse (major, minor, PA): (0.031", 0.018", 100°) * approx speed of asteroid's shadow [km/s]: 10.7710 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 542-032936 by 420 Bertholda on 2024 Dec 4 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 97 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -60 17 2 .. .. .. .... 98 0 0 .. .. .... .. .. .. .. .. .. -60 39 21 .. .. .. -59 52 37 .. .. .. .... 99 0 0 .. .. .... .. .. .. .. .. .. -60 14 39 .. .. .. -59 28 0 .. .. .. .... 100 0 0 -61 22 34 15 46 26.6 1 48 -5 -59 49 47 .. .. .. -59 3 14 .. .. .. .... 101 0 0 -60 57 18 15 46 26.4 1 47 -5 -59 24 45 -62 35 35 -58 38 19 .. .. .. 0.97 102 0 0 -60 31 52 15 46 26.1 2 46 -6 -58 59 34 -62 9 50 -58 13 16 -63 3 43 1.21 103 0 0 -60 6 17 15 46 25.6 3 46 -6 -58 34 16 -61 43 55 -57 48 6 -62 37 36 1.33 104 0 0 -59 40 35 15 46 25.0 3 45 -7 -58 8 52 -61 17 52 -57 22 49 -62 11 20 1.39 105 0 0 -59 14 46 15 46 24.2 4 44 -7 -57 43 22 -60 51 41 -56 57 28 -61 44 56 1.44 106 0 0 -58 48 52 15 46 23.3 4 43 -8 -57 17 47 -60 25 24 -56 32 2 -61 18 25 1.47 107 0 0 -58 22 53 15 46 22.2 5 42 -9 -56 52 8 -59 59 0 -56 6 33 -60 51 47 1.50 108 0 0 -57 56 50 15 46 20.9 6 41 -9 -56 26 27 -59 32 33 -55 41 2 -60 25 5 1.52 109 0 0 -57 30 45 15 46 19.5 7 40 -10 -56 0 44 -59 6 2 -55 15 29 -59 58 18 1.53 110 0 0 -57 4 39 15 46 17.9 7 40 -10 -55 35 1 -58 39 30 -54 49 56 -59 31 30 1.54 111 0 0 -56 38 33 15 46 16.1 8 39 -11 -55 9 17 -58 12 56 -54 24 23 -59 4 39 1.55 112 0 0 -56 12 27 15 46 14.1 9 38 -11 -54 43 35 -57 46 22 -53 58 52 -58 37 49 1.56 113 0 0 -55 46 23 15 46 12.0 9 37 -12 -54 17 55 -57 19 50 -53 33 24 -58 11 0 1.57 114 0 0 -55 20 22 15 46 9.7 10 36 -12 -53 52 18 -56 53 20 -53 7 59 -57 44 12 1.58 115 0 0 -54 54 24 15 46 7.2 11 35 -13 -53 26 46 -56 26 53 -52 42 38 -57 17 28 1.58 116 0 0 -54 28 31 15 46 4.5 11 34 -13 -53 1 19 -56 0 30 -52 17 22 -56 50 48 1.59 117 0 0 -54 2 44 15 46 1.7 12 34 -14 -52 35 57 -55 34 14 -51 52 13 -56 24 13 1.59 118 0 0 -53 37 4 15 45 58.6 13 33 -14 -52 10 43 -55 8 3 -51 27 11 -55 57 45 1.59 119 0 0 -53 11 32 15 45 55.4 13 32 -15 -51 45 36 -54 42 1 -51 2 16 -55 31 24 1.60 120 0 0 -52 46 8 15 45 52.0 14 31 -15 -51 20 39 -54 16 6 -50 37 31 -55 5 12 1.60 121 0 0 -52 20 54 15 45 48.5 15 30 -15 -50 55 51 -53 50 22 -50 12 55 -54 39 9 1.60 122 0 0 -51 55 50 15 45 44.7 15 29 -16 -50 31 13 -53 24 48 -49 48 30 -54 13 17 1.61 123 0 0 -51 30 57 15 45 40.8 16 28 -16 -50 6 47 -52 59 25 -49 24 16 -53 47 37 1.61 124 0 0 -51 6 17 15 45 36.7 17 28 -17 -49 42 33 -52 34 14 -49 0 14 -53 22 8 1.61 125 0 0 -50 41 50 15 45 32.5 17 27 -17 -49 18 32 -52 9 17 -48 36 26 -52 56 53 1.61 126 0 0 -50 17 37 15 45 28.0 18 26 -17 -48 54 44 -51 44 34 -48 12 50 -52 31 52 1.61 127 0 0 -49 53 38 15 45 23.4 19 25 -18 -48 31 11 -51 20 5 -47 49 30 -52 7 6 1.61 128 0 0 -49 29 54 15 45 18.7 19 24 -18 -48 7 53 -50 55 52 -47 26 24 -51 42 36 1.62 129 0 0 -49 6 27 15 45 13.8 20 23 -18 -47 44 52 -50 31 56 -47 3 34 -51 18 22 1.62 130 0 0 -48 43 17 15 45 8.7 20 22 -19 -47 22 6 -50 8 16 -46 41 1 -50 54 26 1.62 131 0 0 -48 20 24 15 45 3.4 21 21 -19 -46 59 38 -49 44 55 -46 18 45 -50 30 48 1.62 132 0 0 -47 57 49 15 44 58.0 22 20 -19 -46 37 28 -49 21 52 -45 56 46 -50 7 29 1.62 133 0 0 -47 35 33 15 44 52.5 22 19 -19 -46 15 37 -48 59 9 -45 35 6 -49 44 29 1.62 134 0 0 -47 13 37 15 44 46.8 23 19 -20 -45 54 4 -48 36 45 -45 13 45 -49 21 50 1.62 135 0 0 -46 52 1 15 44 41.0 23 18 -20 -45 32 51 -48 14 42 -44 52 44 -48 59 31 1.62 136 0 0 -46 30 45 15 44 35.0 24 17 -20 -45 11 59 -47 53 0 -44 32 2 -48 37 33 1.62 137 0 0 -46 9 51 15 44 28.9 24 16 -20 -44 51 27 -47 31 39 -44 11 41 -48 15 58 1.62 138 0 0 -45 49 18 15 44 22.7 25 15 -20 -44 31 17 -47 10 41 -43 51 42 -47 54 45 1.62 139 0 0 -45 29 7 15 44 16.4 25 14 -20 -44 11 28 -46 50 6 -43 32 4 -47 33 55 1.62 140 0 0 -45 9 20 15 44 9.9 26 13 -21 -43 52 2 -46 29 54 -43 12 48 -47 13 29 1.62 141 0 0 -44 49 55 15 44 3.3 26 12 -21 -43 32 58 -46 10 5 -42 53 54 -46 53 27 1.62 142 0 0 -44 30 54 15 43 56.6 27 11 -21 -43 14 18 -45 50 41 -42 35 24 -46 33 49 1.63 143 0 0 -44 12 17 15 43 49.8 27 10 -21 -42 56 1 -45 31 41 -42 17 17 -46 14 36 1.63 144 0 0 -43 54 5 15 43 42.9 28 9 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10 -36 22 57 -40 0 5 1.64 -179 0 0 -38 8 25 15 39 2.0 28 330 -9 -36 58 23 -39 20 52 -36 22 38 -39 59 47 1.64 -178 0 0 -38 8 37 15 38 54.9 28 329 -8 -36 58 34 -39 21 5 -36 22 49 -40 0 1 1.64 -177 0 0 -38 9 21 15 38 48.0 27 328 -7 -36 59 17 -39 21 50 -36 23 31 -40 0 47 1.64 -176 0 0 -38 10 36 15 38 41.1 27 327 -7 -37 0 30 -39 23 7 -36 24 43 -40 2 5 1.64 -175 0 0 -38 12 23 15 38 34.3 26 326 -6 -37 2 14 -39 24 57 -36 26 26 -40 3 56 1.64 -174 0 0 -38 14 41 15 38 27.7 26 325 -6 -37 4 29 -39 27 18 -36 28 39 -40 6 19 1.64 -173 0 0 -38 17 30 15 38 21.1 25 325 -5 -37 7 14 -39 30 11 -36 31 23 -40 9 15 1.64 -172 0 0 -38 20 50 15 38 14.7 25 324 -4 -37 10 31 -39 33 36 -36 34 38 -40 12 42 1.64 -171 0 0 -38 24 42 15 38 8.4 24 323 -4 -37 14 18 -39 37 33 -36 38 23 -40 16 42 1.64 -170 0 0 -38 29 6 15 38 2.1 24 322 -3 -37 18 36 -39 42 2 -36 42 38 -40 21 15 1.65 -169 0 0 -38 34 0 15 37 56.1 23 321 -2 -37 23 25 -39 47 3 -36 47 25 -40 26 19 1.65 -168 0 0 -38 39 26 15 37 50.1 23 320 -1 -37 28 45 -39 52 36 -36 52 41 -40 31 56 1.65 -167 0 0 -38 45 24 15 37 44.3 22 319 -1 -37 34 35 -39 58 41 -36 58 28 -40 38 6 1.65 -166 0 0 -38 51 52 15 37 38.6 22 319 0 -37 40 56 -40 5 18 -37 4 46 -40 44 47 1.65 -165 0 0 -38 58 52 15 37 33.1 21 318 1 -37 47 48 -40 12 27 -37 11 34 -40 52 1 1.65 -164 0 0 -39 6 23 15 37 27.7 20 317 1 -37 55 10 -40 20 7 -37 18 52 -40 59 47 1.65 -163 0 0 -39 14 25 15 37 22.4 20 316 2 -38 3 3 -40 28 19 -37 26 40 -41 8 5 1.66 -162 0 0 -39 22 58 15 37 17.3 19 315 3 -38 11 27 -40 37 3 -37 34 59 -41 16 55 1.66 -161 0 0 -39 32 2 15 37 12.4 19 315 4 -38 20 20 -40 46 19 -37 43 47 -41 26 16 1.66 -160 0 0 -39 41 37 15 37 7.6 18 314 4 -38 29 44 -40 56 5 -37 53 6 -41 36 10 1.66 -159 0 0 -39 51 42 15 37 3.0 17 313 5 -38 39 38 -41 6 24 -38 2 55 -41 46 35 1.66 -158 0 0 -40 2 19 15 36 58.6 17 312 6 -38 50 3 -41 17 13 -38 13 13 -41 57 33 1.66 -157 0 0 -40 13 25 15 36 54.3 16 312 7 -39 0 57 -41 28 34 -38 24 1 -42 9 1 1.67 -156 0 0 -40 25 2 15 36 50.2 15 311 7 -39 12 21 -41 40 25 -38 35 19 -42 21 1 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0 -43 40 42 15 36 13.9 6 302 18 -42 24 20 -45 0 12 -41 45 32 -45 43 9 1.72 -142 0 0 -43 59 2 15 36 12.5 5 301 18 -42 42 20 -45 18 55 -42 3 22 -46 2 6 1.74 -141 0 0 -44 17 49 15 36 11.3 4 300 19 -43 0 45 -45 38 5 -42 21 37 -46 21 30 1.75 -140 0 0 -44 37 1 15 36 10.4 3 300 20 -43 19 36 -45 57 42 -42 40 17 -46 41 21 1.77 -139 0 0 -44 56 39 15 36 9.6 3 299 21 -43 38 52 -46 17 45 -42 59 23 -47 1 38 1.81 -138 0 0 -45 16 43 15 36 9.0 2 298 21 -43 58 33 -46 38 14 -43 18 53 -47 22 22 1.88 -137 0 0 -45 37 11 15 36 8.7 1 298 22 -44 18 38 -46 59 8 -43 38 47 .. .. .. 2.05 -136 0 0 -45 58 3 15 36 8.5 0 297 23 -44 39 6 .. .. .. -43 59 4 .. .. .. 3.56 -135 0 0 .. .. .... .. .. .. .. .. .. -44 59 58 .. .. .. -44 19 45 .. .. .. .... Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 542-032936 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 46 59.3325 DE: +18 16 51.431 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 46 59.3325 DE: +18 16 51.431 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (420) Bertholda asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.077 distance from Earth [AU]: 2.45270 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#127 date of fit: 2023 Feb 11 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): 0.031", 0.018", 100.124° remarks: * orbital elements for (420)Bertholda : Mean anomaly = 348.0566023267 deg Arg. of pericenter = 223.4087590483 deg Long. of node = 242.3553154314 deg Inclination = 6.7156991741 deg Eccentricity = 0.0227929082 Semimajor axis = 3.4258734296 AU Perihelion dist = 3.3477878112 AU Mag: H = 8.38, G = 0.15 Epoch of elements : MJD 60648.65368620 TDT (2024 Dec 04.6537) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1272023Feb11,12.75,2024,12,4,15.688348,0.137962,-0.839225,-5.998971,-0.985877,-0.002835,0.000681,0.000001,0.000000 152.8459,18.2544,-57.71,-22.36,False UCAC4 542-032936,6.78314790,18.2809530,12.63,11.99,11.64,0.0,0,,6.80776499,18.2544197,1.77,1.69,0,0,0 420,Bertholda,13.52,137.364,2.4527,0,0,-1.509,-3.53,,7.4,0 0,347.9550,2024,12,4,223.4088,242.3553,6.7157,0.02279,3.42587,3.34779,8.38,5.0,0.15 1.261,0.0313,0.0183,100,0.0202,Known errors,0.87,0,-1,-1 20241204_032936,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org