IOTA/IOTA-ES occultation update for (4292) Aoba / UCAC4 321-122331 event on 2024 Sep 02, 03:42 UT Visible from Summary ------- On 2024 Sep 02 UT, the 25.208050142936 km diameter asteroid (4292) Aoba will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.20 mag to 17.56 mag (the magnitude of the asteroid) for at most 3.310 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 Sep 02, 03:28 - 2024 Sep 02, 03:56 * geocentric midpoint of event [JD]: 2460555.65456442 * magnitude of target star: 11.36 * magnitude drop [mag]: 6.20 * estimated maximum duration [s]: 3.310 * Moon: 1 % sunlit, 117° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 88°) * approx speed of asteroid's shadow [km/s]: 7.6662 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 321-122331 by 4292 Aoba on 2024 Sep 2 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 133 0 0 -22 20 34 3 29 0.0 0 118 60 -22 28 34 -22 12 34 -22 33 1 -22 8 7 .... 134 0 0 -22 50 4 3 29 0.3 2 117 59 -22 58 4 -22 42 5 -23 2 30 -22 37 39 0.26 135 0 0 -23 19 17 3 29 0.8 3 117 58 -23 27 16 -23 11 19 -23 31 42 -23 6 53 0.25 136 0 0 -23 48 13 3 29 1.7 4 117 57 -23 56 11 -23 40 15 -24 0 37 -23 35 50 0.24 137 0 0 -24 16 50 3 29 2.8 5 116 57 -24 24 47 -24 8 53 -24 29 13 -24 4 28 0.24 138 0 0 -24 45 8 3 29 4.2 6 116 56 -24 53 5 -24 37 12 -24 57 30 -24 32 48 0.24 139 0 0 -25 13 7 3 29 5.9 7 115 55 -25 21 3 -25 5 12 -25 25 27 -25 0 48 0.24 140 0 0 -25 40 46 3 29 7.8 8 115 55 -25 48 40 -25 32 51 -25 53 4 -25 28 28 0.24 141 0 0 -26 8 3 3 29 9.9 9 115 54 -26 15 57 -26 0 10 -26 20 21 -25 55 47 0.24 142 0 0 -26 35 0 3 29 12.4 10 114 53 -26 42 53 -26 27 7 -26 47 16 -26 22 45 0.24 143 0 0 -27 1 35 3 29 15.0 11 114 52 -27 9 27 -26 53 43 -27 13 49 -26 49 21 0.24 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20 - 6 27 8 - 6 47 50 - 6 22 39 0.25 - 57 0 0 - 6 2 1 3 55 38.7 15 245 -87 - 6 10 6 - 5 53 56 - 6 14 35 - 5 49 27 0.26 - 56 0 0 - 5 28 59 3 55 43.0 14 245 -86 - 5 37 3 - 5 20 55 - 5 41 32 - 5 16 26 0.26 - 55 0 0 - 4 56 10 3 55 47.0 13 245 -85 - 5 4 13 - 4 48 7 - 5 8 42 - 4 43 39 0.26 - 54 0 0 - 4 23 35 3 55 50.7 12 245 -84 - 4 31 37 - 4 15 32 - 4 36 5 - 4 11 5 0.26 - 53 0 0 - 3 51 14 3 55 54.0 11 244 -83 - 3 59 15 - 3 43 12 - 4 3 43 - 3 38 45 0.26 - 52 0 0 - 3 19 8 3 55 57.0 10 244 -82 - 3 27 9 - 3 11 8 - 3 31 36 - 3 6 41 0.27 - 51 0 0 - 2 47 19 3 55 59.7 8 244 -81 - 2 55 18 - 2 39 19 - 2 59 45 - 2 34 53 0.27 - 50 0 0 - 2 15 46 3 56 2.0 7 244 -79 - 2 23 45 - 2 7 48 - 2 28 11 - 2 3 22 0.28 - 49 0 0 - 1 44 31 3 56 3.9 6 244 -78 - 1 52 29 - 1 36 34 - 1 56 55 - 1 32 9 0.28 - 48 0 0 - 1 13 35 3 56 5.6 5 244 -77 - 1 21 32 - 1 5 39 - 1 25 57 - 1 1 14 0.29 - 47 0 0 - 0 42 58 3 56 6.9 4 244 -76 - 0 50 54 - 0 35 3 - 0 55 18 - 0 30 39 0.31 - 46 0 0 - 0 12 41 3 56 7.8 3 244 -75 - 0 20 35 - 0 4 47 - 0 24 59 - 0 0 23 0.34 - 45 0 0 0 17 16 3 56 8.5 2 244 -74 0 9 22 0 25 9 0 4 59 0 29 32 0.40 - 44 0 0 0 46 51 3 56 8.8 1 244 -73 0 38 59 0 54 43 0 34 37 0 59 5 0.74 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 321-122331 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 49 47.6338 DE: -25 48 49.172 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 49 47.6337 DE: -25 48 49.172 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4292) Aoba asteroid class: approx. diameter [km]: 25 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.41220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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", 0.003", 87.532° remarks: * orbital elements for (4292)Aoba : Mean anomaly = 178.4913400746 deg Arg. of pericenter = 147.0332436170 deg Long. of node = 321.4355494415 deg Inclination = 3.5496236482 deg Eccentricity = 0.0495003226 Semimajor axis = 2.7499360612 AU Perihelion dist = 2.6138133391 AU Mag: H = 12.36, G = 0.15 Epoch of elements : MJD 60555.15456404 TDT (2024 Sep 02.1546) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,3.31,2024,9,2,3.709546,0.045072,-0.197930,4.218634,0.962288,0.005420,-0.000010,0.000000,0.000000 -129.5991,-25.8222,124.27,7.75,False UCAC4 321-122331,17.82989828,-25.8136589,12.46,11.36,10.77,0.1,0,,17.85548750,-25.8221981,6.20,6.34,0,0,0 4292,Aoba,17.56,25.383,2.4122,0,0,1.139,3.51,,1.8,0 0,178.4579,2024,9,2,147.0332,321.4355,3.5496,0.04950,2.74994,2.61381,12.36,5.0,0.15 1.278,0.0130,0.0033,88,0.0040,Known errors,0.94,0,-1,-1 20240902_122331,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 12:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org