IOTA/IOTA-ES occultation update for (1695) Walbeck / TYC 5159-00829-1 event on 2024 Nov 27, 09:24 UT Visible from Summary ------- On 2024 Nov 27 UT, the 19.576 km diameter asteroid (1695) Walbeck will occult a 11.4 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.84 mag to 17.18 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 Nov 27, 09:21 - 2024 Nov 27, 09:26 * geocentric midpoint of event [JD]: 2460641.89172841 * magnitude of target star: 11.35 * magnitude drop [mag]: 5.84 * estimated maximum duration [s]: 0.520 * Moon: 13 % sunlit, 99° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 37.8594 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5159-00829-1 by 1695 Walbeck on 2024 Nov 27 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 1 0 0 -20 27 35 9 21 24.4 0 97 57 -20 33 11 -20 21 59 -20 35 28 -20 19 42 .... 2 0 0 -20 34 39 9 21 24.4 1 97 58 -20 40 15 -20 29 3 -20 42 32 -20 26 46 0.23 3 0 0 -20 41 38 9 21 24.5 2 96 59 -20 47 14 -20 36 3 -20 49 32 -20 33 46 0.26 4 0 0 -20 48 34 9 21 24.7 3 96 60 -20 54 10 -20 42 59 -20 56 28 -20 40 42 0.28 5 0 0 -20 55 26 9 21 24.9 4 96 61 -21 1 2 -20 49 51 -21 3 19 -20 47 34 0.28 6 0 0 -21 2 14 9 21 25.1 5 95 61 -21 7 50 -20 56 38 -21 10 7 -20 54 21 0.29 7 0 0 -21 8 58 9 21 25.4 6 95 62 -21 14 33 -21 3 22 -21 16 50 -21 1 5 0.29 8 0 0 -21 15 37 9 21 25.7 7 95 63 -21 21 12 -21 10 1 -21 23 29 -21 7 44 0.29 9 0 0 -21 22 11 9 21 26.1 8 94 64 -21 27 47 -21 16 36 -21 30 4 -21 14 19 0.30 10 0 0 -21 28 41 9 21 26.5 9 94 65 -21 34 16 -21 23 5 -21 36 33 -21 20 49 0.30 11 0 0 -21 35 6 9 21 26.9 10 93 66 -21 40 41 -21 29 31 -21 42 58 -21 27 14 0.30 12 0 0 -21 41 26 9 21 27.4 11 93 67 -21 47 2 -21 35 51 -21 49 19 -21 33 34 0.30 13 0 0 -21 47 41 9 21 28.0 12 93 68 -21 53 17 -21 42 6 -21 55 34 -21 39 49 0.30 14 0 0 -21 53 51 9 21 28.6 13 92 69 -21 59 27 -21 48 16 -22 1 44 -21 45 59 0.30 15 0 0 -21 59 56 9 21 29.3 13 92 70 -22 5 31 -21 54 21 -22 7 48 -21 52 4 0.30 16 0 0 -22 5 56 9 21 29.9 14 92 71 -22 11 31 -22 0 21 -22 13 48 -21 58 4 0.30 17 0 0 -22 11 50 9 21 30.7 15 91 72 -22 17 25 -22 6 15 -22 19 42 -22 3 58 0.30 18 0 0 -22 17 39 9 21 31.5 16 91 73 -22 23 14 -22 12 4 -22 25 31 -22 9 47 0.30 19 0 0 -22 23 22 9 21 32.3 17 90 74 -22 28 57 -22 17 47 -22 31 14 -22 15 30 0.30 20 0 0 -22 28 59 9 21 33.2 18 90 75 -22 34 34 -22 23 24 -22 36 51 -22 21 8 0.30 21 0 0 -22 34 31 9 21 34.1 19 90 75 -22 40 6 -22 28 56 -22 42 23 -22 26 39 0.30 22 0 0 -22 39 57 9 21 35.0 20 89 76 -22 45 31 -22 34 22 -22 47 48 -22 32 5 0.30 23 0 0 -22 45 16 9 21 36.0 21 89 77 -22 50 51 -22 39 42 -22 53 8 -22 37 25 0.30 24 0 0 -22 50 30 9 21 37.1 22 88 78 -22 56 5 -22 44 55 -22 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15 0 -18 3 47 -18 17 18 -18 1 30 0.31 150 0 0 -18 1 27 9 26 18.7 32 273 -15 -18 7 4 -17 55 51 -18 9 21 -17 53 33 0.31 151 0 0 -17 53 30 9 26 20.3 31 273 -16 -17 59 6 -17 47 53 -18 1 24 -17 45 36 0.31 152 0 0 -17 45 32 9 26 21.8 30 273 -17 -17 51 8 -17 39 55 -17 53 26 -17 37 38 0.31 153 0 0 -17 37 33 9 26 23.3 30 272 -18 -17 43 9 -17 31 56 -17 45 27 -17 29 39 0.31 154 0 0 -17 29 33 9 26 24.7 29 272 -19 -17 35 10 -17 23 57 -17 37 27 -17 21 39 0.32 155 0 0 -17 21 33 9 26 26.1 28 271 -19 -17 27 10 -17 15 56 -17 29 27 -17 13 39 0.32 156 0 0 -17 13 33 9 26 27.5 27 271 -20 -17 19 9 -17 7 56 -17 21 27 -17 5 39 0.32 157 0 0 -17 5 32 9 26 28.8 26 271 -21 -17 11 9 -16 59 56 -17 13 26 -16 57 38 0.32 158 0 0 -16 57 32 9 26 30.1 25 270 -22 -17 3 8 -16 51 55 -17 5 26 -16 49 38 0.32 159 0 0 -16 49 31 9 26 31.3 24 270 -23 -16 55 8 -16 43 55 -16 57 26 -16 41 38 0.32 160 0 0 -16 41 31 9 26 32.5 23 270 -24 -16 47 8 -16 35 55 -16 49 26 -16 33 38 0.32 161 0 0 -16 33 32 9 26 33.6 22 269 -25 -16 39 9 -16 27 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51 18 0.33 174 0 0 -14 51 32 9 26 44.1 9 265 -36 -14 57 9 -14 45 56 -14 59 26 -14 43 39 0.33 175 0 0 -14 43 56 9 26 44.6 8 265 -37 -14 49 32 -14 38 20 -14 51 49 -14 36 2 0.33 176 0 0 -14 36 22 9 26 45.0 7 265 -37 -14 41 58 -14 30 46 -14 44 16 -14 28 28 0.34 177 0 0 -14 28 51 9 26 45.3 6 265 -38 -14 34 27 -14 23 15 -14 36 44 -14 20 58 0.34 178 0 0 -14 21 23 9 26 45.6 5 264 -39 -14 26 59 -14 15 47 -14 29 16 -14 13 30 0.35 179 0 0 -14 13 58 9 26 45.9 4 264 -40 -14 19 34 -14 8 22 -14 21 52 -14 6 5 0.35 180 0 0 -14 6 37 9 26 46.1 3 264 -41 -14 12 13 -14 1 1 -14 14 30 -13 58 44 0.37 -179 0 0 -13 59 19 9 26 46.2 2 264 -41 -14 4 55 -13 53 43 -14 7 12 -13 51 26 0.39 -178 0 0 -13 52 5 9 26 46.3 1 263 -42 -13 57 41 -13 46 29 -13 59 58 -13 44 11 0.45 -177 0 0 -13 44 54 9 26 46.4 0 263 -43 -13 50 30 -13 39 18 -13 52 47 -13 37 1 0.75 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 5159-00829-1 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 59 55.5754 DE: -06 47 02.178 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 59 55.5753 DE: -06 47 02.179 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1695) Walbeck asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.43010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.013", 0.002", 79.309° remarks: * orbital elements for (1695)Walbeck : Mean anomaly = 341.7696374865 deg Arg. of pericenter = 139.5523910737 deg Long. of node = 218.3730827066 deg Inclination = 16.6852779324 deg Eccentricity = 0.2889431134 Semimajor axis = 2.7843593576 AU Perihelion dist = 1.9798378961 AU Mag: H = 12.57, G = 0.15 Epoch of elements : MJD 60641.39172813 TDT (2024 Nov 27.3917) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,0.52,2024,11,27,9.401482,0.016962,-0.292996,21.331998,1.255674,0.004313,0.001656,-0.000001,0.000000 92.5012,-6.7161,35.91,-21.24,False TYC 5159-00829-1,19.99877099,-6.7839381,11.92,11.35,11.04,0.0,0,,20.02072756,-6.7161423,5.83,5.69,0,0,0 1695,Walbeck,17.18,19.576,2.4301,0,0,5.182,4.55,,1.0,0 0,341.6865,2024,11,27,139.5524,218.3731,16.6853,0.28894,2.78436,1.97984,12.57,5.0,0.15 1.204,0.0127,0.0016,79,0.0023,Known errors,1.07,0,-1,-1 20241127_0829-1,60140.72 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org