IOTA/IOTA-ES occultation update for (2805) Kalle / UCAC4 308-133438 event on 2024 Oct 18, 22:25 UT Visible from Summary ------- On 2024 Oct 18 UT, the 16.6963032859209 km diameter asteroid (2805) Kalle will occult a 10.8 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 7.09 mag to 17.93 mag (the magnitude of the asteroid) for at most 0.520 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 Oct 18, 22:22 - 2024 Oct 18, 22:28 * geocentric midpoint of event [JD]: 2460602.43462359 * magnitude of target star: 10.84 * magnitude drop [mag]: 7.09 * estimated maximum duration [s]: 0.520 * Moon: 97 % sunlit, 141° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 32.3359 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 308-133438 by 2805 Kalle on 2024 Oct 18 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 -177 0 0 .. .. .... .. .. .. .. .. .. 19 28 50 .. .. .. 19 25 5 .. .. .. .... -176 0 0 19 1 11 22 22 48.0 1 121 57 18 55 30 19 6 53 18 51 46 19 10 38 .... -175 0 0 18 27 53 22 22 48.1 2 121 58 18 22 12 18 33 34 18 18 28 18 37 19 -0.20 -174 0 0 17 54 36 22 22 48.3 3 121 59 17 48 56 18 0 17 17 45 12 18 4 1 -0.26 -173 0 0 17 21 23 22 22 48.5 4 122 60 17 15 43 17 27 3 17 11 59 17 30 47 -0.29 -172 0 0 16 48 14 22 22 48.9 5 122 60 16 42 34 16 53 53 16 38 51 16 57 37 -0.31 -171 0 0 16 15 10 22 22 49.3 7 122 61 16 9 31 16 20 49 16 5 47 16 24 32 -0.32 -170 0 0 15 42 12 22 22 49.8 8 122 62 15 36 33 15 47 50 15 32 50 15 51 34 -0.33 -169 0 0 15 9 21 22 22 50.4 9 123 63 15 3 43 15 14 59 15 0 0 15 18 42 -0.34 -168 0 0 14 36 38 22 22 51.1 10 123 64 14 31 1 14 42 16 14 27 19 14 45 58 -0.34 -167 0 0 14 4 5 22 22 51.8 11 123 65 13 58 28 14 9 42 13 54 46 14 13 24 -0.35 -166 0 0 13 31 41 22 22 52.6 12 124 66 13 26 5 13 37 18 13 22 24 13 41 0 -0.35 -165 0 0 12 59 29 22 22 53.5 13 124 66 12 53 54 13 5 5 12 50 13 13 8 47 -0.36 -164 0 0 12 27 29 22 22 54.5 14 124 67 12 21 54 12 33 5 12 18 14 12 36 45 -0.36 -163 0 0 11 55 42 22 22 55.6 15 124 68 11 50 8 12 1 17 11 46 28 12 4 57 -0.36 -162 0 0 11 24 9 22 22 56.7 17 125 68 11 18 36 11 29 43 11 14 56 11 33 23 -0.36 -161 0 0 10 52 51 22 22 57.9 18 125 69 10 47 18 10 58 25 10 43 39 11 2 4 -0.36 -160 0 0 10 21 49 22 22 59.2 19 125 70 10 16 17 10 27 22 10 12 38 10 31 1 -0.36 -159 0 0 9 51 3 22 23 0.6 20 125 70 9 45 32 9 56 35 9 41 54 10 0 14 -0.37 -158 0 0 9 20 35 22 23 2.0 21 125 71 9 15 5 9 26 6 9 11 27 9 29 44 -0.37 -157 0 0 8 50 25 22 23 3.5 22 126 71 8 44 56 8 55 56 8 41 18 8 59 33 -0.37 -156 0 0 8 20 35 22 23 5.1 23 126 71 8 15 6 8 26 4 8 11 29 8 29 41 -0.37 -155 0 0 7 51 4 22 23 6.7 24 126 72 7 45 35 7 56 32 7 41 59 8 0 9 -0.37 -154 0 0 7 21 53 22 23 8.4 25 126 72 7 16 26 7 27 21 7 12 50 7 30 57 -0.37 -153 0 0 6 53 4 22 23 10.2 26 127 72 6 47 38 6 58 31 6 44 3 7 2 7 -0.37 -152 0 0 6 24 37 22 23 12.1 28 127 72 6 19 12 6 30 4 6 15 37 6 33 38 -0.37 -151 0 0 5 56 33 22 23 14.0 29 127 72 5 51 8 6 1 58 5 47 34 6 5 33 -0.37 -150 0 0 5 28 52 22 23 16.0 30 127 72 5 23 28 5 34 17 5 19 55 5 37 50 -0.37 -149 0 0 5 1 35 22 23 18.0 31 127 72 4 56 12 5 6 59 4 52 39 5 10 32 -0.37 -148 0 0 4 34 43 22 23 20.2 32 128 71 4 29 20 4 40 6 4 25 48 4 43 38 -0.38 -147 0 0 4 8 15 22 23 22.3 33 128 71 4 2 54 4 13 37 3 59 22 4 17 9 -0.38 -146 0 0 3 42 14 22 23 24.6 34 128 71 3 36 53 3 47 35 3 33 22 3 51 6 -0.38 -145 0 0 3 16 38 22 23 26.8 35 128 70 3 11 18 3 21 58 3 7 48 3 25 29 -0.38 -144 0 0 2 51 29 22 23 29.2 36 129 70 2 46 10 2 56 49 2 42 40 3 0 19 -0.38 -143 0 0 2 26 48 22 23 31.6 37 129 69 2 21 29 2 32 6 2 18 0 2 35 36 -0.38 -142 0 0 2 2 33 22 23 34.0 38 129 69 1 57 16 2 7 51 1 53 47 2 11 20 -0.38 -141 0 0 1 38 47 22 23 36.5 39 130 68 1 33 31 1 44 4 1 30 2 1 47 33 -0.38 -140 0 0 1 15 29 22 23 39.1 40 130 67 1 10 14 1 20 45 1 6 46 1 24 14 -0.38 -139 0 0 0 52 40 22 23 41.7 41 130 67 0 47 25 0 57 55 0 43 58 1 1 23 -0.38 -138 0 0 0 30 20 22 23 44.3 42 131 66 0 25 6 0 35 35 0 21 39 0 39 2 -0.38 -137 0 0 0 8 30 22 23 47.0 43 131 65 0 3 16 0 13 43 - 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38 0 0 8 13 33 22 28 42.0 20 235 -34 8 8 4 8 19 2 8 4 28 8 22 39 -0.39 - 37 0 0 8 43 17 22 28 43.4 19 236 -35 8 37 48 8 48 47 8 34 11 8 52 25 -0.39 - 36 0 0 9 13 21 22 28 44.7 18 236 -36 9 7 51 9 18 52 9 4 13 9 22 30 -0.39 - 35 0 0 9 43 43 22 28 46.0 17 236 -37 9 38 12 9 49 15 9 34 34 9 52 53 -0.39 - 34 0 0 10 14 23 22 28 47.1 16 236 -38 10 8 51 10 19 56 10 5 13 10 23 34 -0.39 - 33 0 0 10 45 20 22 28 48.2 15 237 -39 10 39 47 10 50 53 10 36 8 10 54 32 -0.39 - 32 0 0 11 16 33 22 28 49.2 14 237 -40 11 10 59 11 22 6 11 7 20 11 25 46 -0.39 - 31 0 0 11 48 0 22 28 50.2 13 237 -41 11 42 26 11 53 35 11 38 46 11 57 15 -0.39 - 30 0 0 12 19 42 22 28 51.0 11 237 -42 12 14 7 12 25 17 12 10 27 12 28 58 -0.39 - 29 0 0 12 51 37 22 28 51.8 10 237 -43 12 46 2 12 57 13 12 42 21 13 0 54 -0.39 - 28 0 0 13 23 45 22 28 52.5 9 238 -44 13 18 8 13 29 21 13 14 27 13 33 2 -0.39 - 27 0 0 13 56 3 22 28 53.1 8 238 -45 13 50 27 14 1 40 13 46 45 14 5 22 -0.39 - 26 0 0 14 28 32 22 28 53.7 7 238 -46 14 22 55 14 34 10 14 19 13 14 37 52 -0.39 - 25 0 0 15 1 11 22 28 54.1 6 238 -47 14 55 33 15 6 49 14 51 51 15 10 32 -0.39 - 24 0 0 15 33 58 22 28 54.5 5 239 -48 15 28 20 15 39 36 15 24 37 15 43 20 -0.39 - 23 0 0 16 6 52 22 28 54.8 4 239 -49 16 1 14 16 12 31 15 57 30 16 16 15 -0.39 - 22 0 0 16 39 53 22 28 55.0 3 239 -50 16 34 14 16 45 33 16 30 31 16 49 17 -0.40 - 21 0 0 17 12 59 22 28 55.2 2 240 -51 17 7 20 17 18 39 17 3 36 17 22 23 -0.41 - 20 0 0 17 46 10 22 28 55.2 0 240 -51 17 40 30 17 51 50 17 36 46 17 55 35 -0.46 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 308-133438 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 40 41.8165 DE: -28 26 10.895 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 40 41.8165 DE: -28 26 10.895 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2805) Kalle asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.87750 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): 0.011", 0.002", 98.414° remarks: * orbital elements for (2805)Kalle : Mean anomaly = 301.9439011275 deg Arg. of pericenter = 310.2205857286 deg Long. of node = 49.0734074005 deg Inclination = 6.8802010370 deg Eccentricity = 0.1440227415 Semimajor axis = 2.6946006045 AU Perihelion dist = 2.3065168381 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60601.93462350 TDT (2024 Oct 18.9346) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,0.52,2024,10,18,22.430966,0.005346,0.363731,18.248924,-0.292502,0.004908,-0.000404,-0.000001,0.000000 -98.7989,-28.4504,-160.22,-10.05,False UCAC4 308-133438,17.67828241,-28.4363598,11.36,10.84,10.56,0.1,0,,17.70413914,-28.4504253,7.09,6.92,0,0,0 2805,Kalle,17.93,16.905,2.8775,0,0,4.229,-0.89,,1.0,0 0,301.7356,2024,10,18,310.2206,49.0734,6.8802,0.14402,2.69460,2.30652,12.62,5.0,0.15 1.329,0.0113,0.0022,98,0.0027,Known errors,0.71,0,-1,-1 20241018_133438,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org