IOTA/IOTA-ES occultation update for (2805) Kalle / TYC 6811-01958-1 event on 2024 Mar 14, 14:44 UT Visible from Summary ------- On 2024 Mar 14 UT, the 16.8133267782367 km diameter asteroid (2805) Kalle will occult a 10.3 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.64 mag to 17.95 mag (the magnitude of the asteroid) for at most 1.230 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 Mar 14, 14:37 - 2024 Mar 14, 14:50 * geocentric midpoint of event [JD]: 2460384.11402029 * magnitude of target star: 10.31 * magnitude drop [mag]: 7.64 * estimated maximum duration [s]: 1.230 * Moon: 24 % sunlit, 155° distance * Sun: 96° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 102°) * approx speed of asteroid's shadow [km/s]: 14.0072 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6811-01958-1 by 2805 Kalle on 2024 Mar 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 127 0 0 -18 14 29 14 37 58.7 0 115 -64 -18 20 51 -18 8 7 -18 22 35 -18 6 24 .... 128 0 0 -18 42 11 14 37 58.9 1 115 -65 -18 48 34 -18 35 47 -18 50 18 -18 34 4 0.58 129 0 0 -19 10 20 14 37 59.2 3 115 -65 -19 16 45 -19 3 55 -19 18 30 -19 2 11 0.64 130 0 0 -19 38 57 14 37 59.8 4 114 -65 -19 45 24 -19 32 31 -19 47 9 -19 30 47 0.66 131 0 0 -20 8 1 14 38 0.5 5 114 -65 -20 14 29 -20 1 33 -20 16 14 -19 59 49 0.68 132 0 0 -20 37 31 14 38 1.5 6 114 -65 -20 44 1 -20 31 2 -20 45 46 -20 29 17 0.69 133 0 0 -21 7 26 14 38 2.6 7 113 -65 -21 13 58 -21 0 56 -21 15 44 -20 59 10 0.69 134 0 0 -21 37 46 14 38 3.9 8 113 -65 -21 44 19 -21 31 14 -21 46 6 -21 29 28 0.70 135 0 0 -22 8 30 14 38 5.4 9 112 -65 -22 15 5 -22 1 57 -22 16 51 -22 0 10 0.70 136 0 0 -22 39 38 14 38 7.1 10 112 -64 -22 46 13 -22 33 2 -22 48 0 -22 31 16 0.70 137 0 0 -23 11 7 14 38 9.0 11 112 -64 -23 17 44 -23 4 30 -23 19 32 -23 2 43 0.70 138 0 0 -23 42 58 14 38 11.1 12 111 -64 -23 49 36 -23 36 20 -23 51 24 -23 34 32 0.71 139 0 0 -24 15 9 14 38 13.3 13 111 -63 -24 21 49 -24 8 29 -24 23 37 -24 6 41 0.71 140 0 0 -24 47 39 14 38 15.8 14 110 -63 -24 54 21 -24 40 58 -24 56 10 -24 39 10 0.71 141 0 0 -25 20 28 14 38 18.4 15 110 -63 -25 27 12 -25 13 46 -25 29 1 -25 11 57 0.71 142 0 0 -25 53 35 14 38 21.2 16 109 -62 -26 0 19 -25 46 51 -26 2 9 -25 45 2 0.71 143 0 0 -26 26 58 14 38 24.2 17 109 -61 -26 33 44 -26 20 13 -26 35 34 -26 18 23 0.71 144 0 0 -27 0 36 14 38 27.4 18 108 -61 -27 7 23 -26 53 49 -27 9 13 -26 51 59 0.71 145 0 0 -27 34 28 14 38 30.7 19 108 -60 -27 41 17 -27 27 40 -27 43 7 -27 25 50 0.71 146 0 0 -28 8 33 14 38 34.3 20 107 -60 -28 15 23 -28 1 44 -28 17 14 -27 59 53 0.71 147 0 0 -28 42 50 14 38 37.9 21 107 -59 -28 49 41 -28 36 0 -28 51 32 -28 34 9 0.71 148 0 0 -29 17 17 14 38 41.8 22 106 -58 -29 24 10 -29 10 26 -29 26 1 -29 8 34 0.71 149 0 0 -29 51 54 14 38 45.8 23 105 -57 -29 58 48 -29 45 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49 -53 44 57 -53 28 1 0.74 - 41 0 0 -53 14 44 14 50 3.9 15 250 39 -53 21 26 -53 8 3 -53 23 14 -53 6 15 0.74 - 40 0 0 -52 52 33 14 50 5.7 14 249 39 -52 59 16 -52 45 51 -53 1 5 -52 44 2 0.75 - 39 0 0 -52 29 55 14 50 7.3 14 248 40 -52 36 39 -52 23 11 -52 38 29 -52 21 22 0.75 - 38 0 0 -52 6 50 14 50 9.0 13 247 40 -52 13 35 -52 0 5 -52 15 25 -51 58 15 0.75 - 37 0 0 -51 43 17 14 50 10.5 12 246 40 -51 50 4 -51 36 31 -51 51 54 -51 34 41 0.75 - 36 0 0 -51 19 18 14 50 12.0 11 246 41 -51 26 6 -51 12 31 -51 27 57 -51 10 41 0.76 - 35 0 0 -50 54 53 14 50 13.4 11 245 41 -51 1 42 -50 48 4 -51 3 33 -50 46 14 0.76 - 34 0 0 -50 30 1 14 50 14.7 10 244 41 -50 36 51 -50 23 11 -50 38 42 -50 21 20 0.76 - 33 0 0 -50 4 42 14 50 16.0 9 243 42 -50 11 33 -49 57 51 -50 13 25 -49 56 0 0.77 - 32 0 0 -49 38 57 14 50 17.1 8 242 42 -49 45 50 -49 32 5 -49 47 42 -49 30 14 0.78 - 31 0 0 -49 12 46 14 50 18.2 8 242 42 -49 19 40 -49 5 54 -49 21 32 -49 4 2 0.78 - 30 0 0 -48 46 10 14 50 19.2 7 241 43 -48 53 5 -48 39 16 -48 54 57 -48 37 24 0.79 - 29 0 0 -48 19 9 14 50 20.1 6 240 43 -48 26 4 -48 12 14 -48 27 57 -48 10 22 0.80 - 28 0 0 -47 51 42 14 50 20.8 5 239 43 -47 58 38 -47 44 46 -48 0 31 -47 42 54 0.82 - 27 0 0 -47 23 51 14 50 21.5 4 239 43 -47 30 48 -47 16 55 -47 32 41 -47 15 2 0.84 - 26 0 0 -46 55 36 14 50 22.1 3 238 44 -47 2 34 -46 48 39 -47 4 27 -46 46 46 0.87 - 25 0 0 -46 26 57 14 50 22.5 3 237 44 -46 33 56 -46 20 0 -46 35 50 -46 18 7 0.91 - 24 0 0 -45 57 56 14 50 22.9 2 236 44 -46 4 55 -45 50 57 -46 6 49 -45 49 4 1.01 - 23 0 0 -45 28 32 14 50 23.1 1 236 44 -45 35 32 -45 21 33 -45 37 26 -45 19 40 1.27 - 22 0 0 -44 58 46 14 50 23.2 0 235 44 -45 5 47 -44 51 47 -45 7 41 .. .. .. 7.07 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: TYC 6811-01958-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 07 04.8317 DE: -24 01 59.863 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 07 04.8317 DE: -24 01 59.863 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.3 * B mag [mag]: 11.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2805) Kalle asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.56920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.012", 0.001", 101.7° remarks: * orbital elements for (2805)Kalle : Mean anomaly = 253.3619674218 deg Arg. of pericenter = 310.1704034279 deg Long. of node = 49.0749098032 deg Inclination = 6.8804797002 deg Eccentricity = 0.1441157301 Semimajor axis = 2.6949639861 AU Perihelion dist = 2.3065772836 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60383.61401995 TDT (2024 Mar 14.6140) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,1.23,2024,3,14,14.736487,-0.151570,-0.553806,7.624963,-2.089483,-0.005792,0.000527,0.000000,0.000000 -136.6185,-24.0660,-38.79,-2.18,False TYC 6811-01958-1,17.11800878,-24.0332953,11.53,10.31,9.65,0.2,0,,17.14251223,-24.0660314,7.65,7.85,0,0,0 2805,Kalle,17.95,17.186,2.5692,0,0,1.906,-7.15,,1.0,0 0,253.2252,2024,3,14,310.1704,49.0749,6.8805,0.14412,2.69496,2.30658,12.62,5.0,0.15 1.135,0.0123,0.0010,102,0.0012,Known errors,0.94,0,-1,-1 20240314_1958-1,60139.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org