IOTA/IOTA-ES occultation update for (1695) Walbeck / UCAC4 417-115297 event on 2024 Oct 28, 12:26 UT Visible from Summary ------- On 2024 Oct 28 UT, the 19.539 km diameter asteroid (1695) Walbeck will occult a 10.9 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 6.23 mag to 17.11 mag (the magnitude of the asteroid) for at most 0.670 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 28, 12:22 - 2024 Oct 28, 12:30 * geocentric midpoint of event [JD]: 2460612.01842579 * magnitude of target star: 10.88 * magnitude drop [mag]: 6.23 * estimated maximum duration [s]: 0.670 * Moon: 14 % sunlit, 114° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 78°) * approx speed of asteroid's shadow [km/s]: 29.1341 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 417-115297 by 1695 Walbeck on 2024 Oct 28 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 - 26 0 0 6 42 43 12 22 53.3 0 97 64 6 37 23 6 48 4 6 33 47 6 51 39 .... - 25 0 0 6 35 38 12 22 53.4 1 97 65 6 30 17 6 40 58 6 26 42 6 44 34 0.01 - 24 0 0 6 28 27 12 22 53.5 2 97 66 6 23 7 6 33 48 6 19 31 6 37 23 -0.01 - 23 0 0 6 21 12 12 22 53.7 3 97 66 6 15 51 6 26 32 6 12 16 6 30 8 -0.02 - 22 0 0 6 13 51 12 22 53.9 4 97 67 6 8 31 6 19 12 6 4 55 6 22 48 -0.02 - 21 0 0 6 6 26 12 22 54.3 5 97 68 6 1 6 6 11 47 5 57 30 6 15 23 -0.02 - 20 0 0 5 58 57 12 22 54.6 6 97 68 5 53 36 6 4 17 5 50 0 6 7 53 -0.03 - 19 0 0 5 51 22 12 22 55.1 7 97 69 5 46 2 5 56 43 5 42 26 6 0 19 -0.03 - 18 0 0 5 43 44 12 22 55.6 8 98 69 5 38 23 5 49 5 5 34 47 5 52 40 -0.03 - 17 0 0 5 36 1 12 22 56.2 9 98 70 5 30 40 5 41 22 5 27 5 5 44 58 -0.03 - 16 0 0 5 28 14 12 22 56.9 10 98 70 5 22 53 5 33 35 5 19 18 5 37 11 -0.03 - 15 0 0 5 20 24 12 22 57.6 11 98 71 5 15 3 5 25 45 5 11 27 5 29 20 -0.03 - 14 0 0 5 12 29 12 22 58.4 12 98 71 5 7 8 5 17 50 5 3 32 5 21 26 -0.03 - 13 0 0 5 4 31 12 22 59.3 13 98 71 4 59 10 5 9 52 4 55 34 5 13 28 -0.03 - 12 0 0 4 56 29 12 23 0.2 14 98 72 4 51 8 5 1 50 4 47 32 5 5 26 -0.03 - 11 0 0 4 48 24 12 23 1.2 15 98 72 4 43 3 4 53 46 4 39 27 4 57 21 -0.03 - 10 0 0 4 40 16 12 23 2.3 16 98 72 4 34 55 4 45 37 4 31 19 4 49 13 -0.03 - 9 0 0 4 32 5 12 23 3.4 17 98 72 4 26 44 4 37 26 4 23 8 4 41 2 -0.03 - 8 0 0 4 23 51 12 23 4.6 18 98 72 4 18 30 4 29 12 4 14 54 4 32 48 -0.03 - 7 0 0 4 15 34 12 23 5.8 19 99 72 4 10 13 4 20 55 4 6 37 4 24 31 -0.03 - 6 0 0 4 7 15 12 23 7.2 20 99 72 4 1 54 4 12 36 3 58 18 4 16 12 -0.03 - 5 0 0 3 58 53 12 23 8.5 22 99 72 3 53 32 4 4 14 3 49 56 4 7 50 -0.03 - 4 0 0 3 50 29 12 23 10.0 23 99 72 3 45 8 3 55 50 3 41 32 3 59 26 -0.03 - 3 0 0 3 42 3 12 23 11.5 24 99 72 3 36 42 3 47 24 3 33 5 3 51 0 -0.03 - 2 0 0 3 33 35 12 23 13.1 25 99 71 3 28 13 3 38 56 3 24 37 3 42 32 -0.03 - 1 0 0 3 25 5 12 23 14.7 26 99 71 3 19 44 3 30 26 3 16 7 3 34 2 -0.03 0 0 0 3 16 33 12 23 16.4 27 99 71 3 11 12 3 21 55 3 7 36 3 25 31 -0.03 1 0 0 3 8 0 12 23 18.2 28 99 70 3 2 39 3 13 22 2 59 3 3 16 58 -0.03 2 0 0 2 59 26 12 23 20.0 29 99 70 2 54 5 3 4 48 2 50 29 3 8 24 -0.03 3 0 0 2 50 51 12 23 21.9 30 99 69 2 45 29 2 56 12 2 41 53 2 59 48 -0.03 4 0 0 2 42 15 12 23 23.9 31 99 69 2 36 53 2 47 36 2 33 17 2 51 12 -0.03 5 0 0 2 33 37 12 23 25.9 32 99 68 2 28 16 2 38 59 2 24 40 2 42 35 -0.03 6 0 0 2 25 0 12 23 28.0 33 99 68 2 19 38 2 30 21 2 16 2 2 33 57 -0.03 7 0 0 2 16 21 12 23 30.1 34 100 67 2 11 0 2 21 43 2 7 24 2 25 19 -0.03 8 0 0 2 7 43 12 23 32.3 35 100 66 2 2 21 2 13 4 1 58 45 2 16 41 -0.03 9 0 0 1 59 4 12 23 34.5 36 100 66 1 53 43 2 4 26 1 50 7 2 8 2 -0.03 10 0 0 1 50 26 12 23 36.8 37 100 65 1 45 4 1 55 47 1 41 28 1 59 23 -0.03 11 0 0 1 41 47 12 23 39.2 38 100 64 1 36 26 1 47 9 1 32 50 1 50 45 -0.03 12 0 0 1 33 9 12 23 41.6 39 100 64 1 27 48 1 38 31 1 24 12 1 42 7 -0.03 13 0 0 1 24 32 12 23 44.1 40 100 63 1 19 11 1 29 54 1 15 34 1 33 30 -0.03 14 0 0 1 15 55 12 23 46.6 41 100 62 1 10 34 1 21 17 1 6 58 1 24 53 -0.03 15 0 0 1 7 20 12 23 49.2 42 100 61 1 1 58 1 12 41 0 58 22 1 16 17 -0.03 16 0 0 0 58 45 12 23 51.8 43 100 60 0 53 23 1 4 6 0 49 47 1 7 42 -0.03 17 0 0 0 50 11 12 23 54.5 44 100 60 0 44 50 0 55 33 0 41 14 0 59 9 -0.03 18 0 0 0 41 39 12 23 57.2 45 100 59 0 36 18 0 47 1 0 32 42 0 50 37 -0.03 19 0 0 0 33 9 12 24 0.0 46 100 58 0 27 47 0 38 30 0 24 11 0 42 6 -0.03 20 0 0 0 24 40 12 24 2.8 47 100 57 0 19 19 0 30 1 0 15 43 0 33 38 -0.03 21 0 0 0 16 13 12 24 5.7 48 100 56 0 10 52 0 21 35 0 7 16 0 25 11 -0.03 22 0 0 0 7 48 12 24 8.7 49 100 55 0 2 27 0 13 10 - 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4 20 36 - 4 34 50 - 4 17 2 -0.04 133 0 0 - 4 20 52 12 29 59.6 18 264 -51 - 4 26 11 - 4 15 32 - 4 29 46 - 4 11 58 -0.04 134 0 0 - 4 15 41 12 30 0.8 17 264 -52 - 4 21 0 - 4 10 21 - 4 24 35 - 4 6 46 -0.04 135 0 0 - 4 10 22 12 30 1.9 16 264 -52 - 4 15 42 - 4 5 3 - 4 19 16 - 4 1 28 -0.04 136 0 0 - 4 4 57 12 30 3.0 15 264 -53 - 4 10 16 - 3 59 37 - 4 13 51 - 3 56 2 -0.03 137 0 0 - 3 59 25 12 30 3.9 14 264 -54 - 4 4 44 - 3 54 5 - 4 8 19 - 3 50 30 -0.03 138 0 0 - 3 53 46 12 30 4.9 13 264 -55 - 3 59 5 - 3 48 26 - 4 2 40 - 3 44 51 -0.03 139 0 0 - 3 48 0 12 30 5.7 12 264 -56 - 3 53 20 - 3 42 40 - 3 56 55 - 3 39 5 -0.03 140 0 0 - 3 42 8 12 30 6.5 11 264 -57 - 3 47 28 - 3 36 48 - 3 51 2 - 3 33 13 -0.03 141 0 0 - 3 36 9 12 30 7.2 10 264 -58 - 3 41 29 - 3 30 49 - 3 45 4 - 3 27 14 -0.03 142 0 0 - 3 30 4 12 30 7.9 9 264 -59 - 3 35 24 - 3 24 44 - 3 38 59 - 3 21 9 -0.03 143 0 0 - 3 23 53 12 30 8.5 8 264 -60 - 3 29 13 - 3 18 33 - 3 32 48 - 3 14 58 -0.03 144 0 0 - 3 17 35 12 30 9.0 7 264 -61 - 3 22 55 - 3 12 15 - 3 26 30 - 3 8 40 -0.03 145 0 0 - 3 11 12 12 30 9.5 6 264 -61 - 3 16 32 - 3 5 52 - 3 20 7 - 3 2 17 -0.03 146 0 0 - 3 4 43 12 30 9.9 5 264 -62 - 3 10 3 - 2 59 23 - 3 13 38 - 2 55 47 -0.03 147 0 0 - 2 58 8 12 30 10.2 4 264 -63 - 3 3 28 - 2 52 48 - 3 7 3 - 2 49 12 -0.03 148 0 0 - 2 51 27 12 30 10.5 3 264 -64 - 2 56 47 - 2 46 7 - 3 0 23 - 2 42 32 -0.03 149 0 0 - 2 44 41 12 30 10.6 2 263 -65 - 2 50 1 - 2 39 21 - 2 53 37 - 2 35 45 -0.02 150 0 0 - 2 37 49 12 30 10.8 1 263 -66 - 2 43 10 - 2 32 29 - 2 46 45 - 2 28 54 -0.02 151 0 0 - 2 30 53 12 30 10.8 0 263 -67 - 2 36 13 - 2 25 32 - 2 39 48 - 2 21 57 0.05 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 417-115297 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 02 19.3768 DE: -06 39 38.333 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 02 19.3767 DE: -06 39 38.333 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.9 * B mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1695) Walbeck asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.012 distance from Earth [AU]: 2.20700 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", 78.322° remarks: * orbital elements for (1695)Walbeck : Mean anomaly = 335.4361654820 deg Arg. of pericenter = 139.5478574852 deg Long. of node = 218.3733244647 deg Inclination = 16.6852648314 deg Eccentricity = 0.2889637907 Semimajor axis = 2.7844633012 AU Perihelion dist = 1.9798542307 AU Mag: H = 12.57, G = 0.15 Epoch of elements : MJD 60611.51842550 TDT (2024 Oct 28.5184) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,0.67,2024,10,28,12.442219,0.002700,0.037211,16.390761,-1.323707,0.005109,0.001074,-0.000001,0.000000 61.9354,-6.6245,-10.70,-13.38,False UCAC4 417-115297,19.03871581,-6.6606480,10.98,10.88,10.83,0.0,0,,19.06076788,-6.6244802,6.24,5.84,0,0,0 1695,Walbeck,17.11,19.539,2.2070,0,0,4.384,-5.27,,1.0,0 0,335.3262,2024,10,28,139.5479,218.3733,16.6853,0.28896,2.78446,1.97985,12.57,5.0,0.15 1.336,0.0130,0.0020,78,0.0041,Known errors,0.93,0,-1,-1 20241028_115297,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org