IOTA/IOTA-ES occultation update for (523) Ada / UCAC4 380-161630 event on 2024 Nov 15, 10:49 UT Visible from Summary ------- On 2024 Nov 15 UT, the 32.063 km diameter asteroid (523) Ada will occult a 11.6 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.33 mag to 15.91 mag (the magnitude of the asteroid) for at most 1.470 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 15, 10:44 - 2024 Nov 15, 10:54 * geocentric midpoint of event [JD]: 2460629.95108763 * magnitude of target star: 11.60 * magnitude drop [mag]: 4.33 * estimated maximum duration [s]: 1.470 * Moon: 100 % sunlit, 97° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 69°) * approx speed of asteroid's shadow [km/s]: 21.7482 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 380-161630 by 523 Ada on 2024 Nov 15 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 -25 31 32 10 44 49.1 1 105 74 -25 40 50 -25 22 15 -25 45 15 -25 17 50 .... 0 0 0 -25 46 27 10 44 49.2 1 105 74 -25 55 44 -25 37 9 -26 0 8 -25 32 45 0.24 1 0 0 -26 1 7 10 44 49.4 2 104 75 -26 10 24 -25 51 51 -26 14 48 -25 47 27 0.24 2 0 0 -26 15 33 10 44 49.6 3 104 76 -26 24 50 -26 6 17 -26 29 14 -26 1 54 0.25 3 0 0 -26 29 46 10 44 49.9 4 104 76 -26 39 1 -26 20 30 -26 43 25 -26 16 7 0.25 4 0 0 -26 43 43 10 44 50.3 5 103 77 -26 52 58 -26 34 28 -26 57 22 -26 30 5 0.25 5 0 0 -26 57 26 10 44 50.8 6 103 78 -27 6 41 -26 48 12 -27 11 4 -26 43 49 0.25 6 0 0 -27 10 54 10 44 51.4 7 102 78 -27 20 8 -27 1 41 -27 24 31 -26 57 18 0.25 7 0 0 -27 24 8 10 44 52.0 8 102 79 -27 33 21 -27 14 54 -27 37 44 -27 10 32 0.25 8 0 0 -27 37 6 10 44 52.7 9 101 79 -27 46 18 -27 27 53 -27 50 41 -27 23 31 0.25 9 0 0 -27 49 48 10 44 53.5 10 101 79 -27 59 1 -27 40 36 -28 3 23 -27 36 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- 5 47 42 - 5 28 57 - 5 52 9 - 5 24 30 0.27 170 0 0 - 5 20 11 10 54 9.7 14 257 -57 - 5 29 33 - 5 10 49 - 5 34 0 - 5 6 23 0.27 171 0 0 - 5 2 14 10 54 11.0 13 257 -58 - 5 11 36 - 4 52 52 - 5 16 2 - 4 48 26 0.27 172 0 0 - 4 44 28 10 54 12.1 12 257 -59 - 4 53 50 - 4 35 8 - 4 58 16 - 4 30 42 0.27 173 0 0 - 4 26 55 10 54 13.2 11 257 -60 - 4 36 16 - 4 17 35 - 4 40 42 - 4 13 9 0.28 174 0 0 - 4 9 34 10 54 14.1 10 256 -61 - 4 18 54 - 4 0 14 - 4 23 20 - 3 55 49 0.28 175 0 0 - 3 52 26 10 54 15.0 8 256 -62 - 4 1 46 - 3 43 7 - 4 6 11 - 3 38 41 0.28 176 0 0 - 3 35 31 10 54 15.7 7 256 -62 - 3 44 50 - 3 26 12 - 3 49 15 - 3 21 47 0.28 177 0 0 - 3 18 49 10 54 16.4 6 256 -63 - 3 28 7 - 3 9 31 - 3 32 33 - 3 5 6 0.29 178 0 0 - 3 2 21 10 54 17.0 5 256 -64 - 3 11 39 - 2 53 3 - 3 16 4 - 2 48 39 0.30 179 0 0 - 2 46 7 10 54 17.4 4 256 -65 - 2 55 24 - 2 36 49 - 2 59 49 - 2 32 25 0.31 180 0 0 - 2 30 7 10 54 17.8 3 256 -65 - 2 39 24 - 2 20 50 - 2 43 48 - 2 16 26 0.32 -179 0 0 - 2 14 21 10 54 18.1 2 256 -66 - 2 23 38 - 2 5 5 - 2 28 2 - 2 0 42 0.35 -178 0 0 - 1 58 51 10 54 18.2 1 256 -67 - 2 8 7 - 1 49 36 - 2 12 30 - 1 45 12 0.43 -177 0 0 - 1 43 35 10 54 18.3 0 256 -68 - 1 52 51 - 1 34 21 - 1 57 14 - 1 29 58 1.29 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 380-161630 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 44 11.4476 DE: -14 06 06.731 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 44 11.4473 DE: -14 06 06.733 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (523) Ada asteroid class: approx. diameter [km]: 32 approx. diameter ["]: 0.014 distance from Earth [AU]: 3.26450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.010", 0.003", 68.995° remarks: * orbital elements for (523)Ada : Mean anomaly = 255.3660566560 deg Arg. of pericenter = 189.9576567240 deg Long. of node = 260.5929635821 deg Inclination = 4.3148939246 deg Eccentricity = 0.1799959994 Semimajor axis = 2.9644790081 AU Perihelion dist = 2.4308846463 AU Mag: H = 9.91, G = 0.15 Epoch of elements : MJD 60629.45108729 TDT (2024 Nov 15.4511) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.47,2024,11,15,10.826103,0.051780,-0.234298,11.999464,2.587673,0.005542,0.001609,0.000000,0.000000 93.9810,-14.0127,13.78,-18.67,False UCAC4 380-161630,20.73651325,-14.1018697,11.95,11.60,11.41,0.0,0,,20.75937271,-14.0126983,4.33,4.08,0,0,0 523,Ada,15.91,32.063,3.2645,0,0,2.222,6.98,,2.4,0 0,255.2790,2024,11,15,189.9577,260.5930,4.3149,0.18000,2.96448,2.43088,9.91,5.0,0.15 1.237,0.0097,0.0029,69,0.0032,Known errors,1.10,0,-1,-1 20241115_161630,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org