IOTA/IOTA-ES occultation update for (3313) Mendel / UCAC4 345-087193 event on 2024 Sep 21, 23:33 UT Visible from Summary ------- On 2024 Sep 21 UT, the 9.26774264594244 km diameter asteroid (3313) Mendel will occult a 11.5 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 5.75 mag to 17.21 mag (the magnitude of the asteroid) for at most 0.360 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: 97 * date and approx. time of event: 2024 Sep 21, 23:29 - 2024 Sep 21, 23:37 * geocentric midpoint of event [JD]: 2460575.48183404 * magnitude of target star: 11.47 * magnitude drop [mag]: 5.75 * estimated maximum duration [s]: 0.360 * Moon: 79 % sunlit, 158° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 26.3733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-087193 by 3313 Mendel on 2024 Sep 21 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 169 0 0 - 5 52 57 23 29 49.5 0 111 72 - 5 55 42 - 5 50 11 - 5 57 48 - 5 48 5 .... 170 0 0 - 6 16 15 23 29 49.5 1 111 73 - 6 19 0 - 6 13 29 - 6 21 6 - 6 11 23 0.16 171 0 0 - 6 39 31 23 29 49.7 2 111 74 - 6 42 16 - 6 36 45 - 6 44 22 - 6 34 39 0.12 172 0 0 - 7 2 44 23 29 49.9 3 111 75 - 7 5 29 - 6 59 58 - 7 7 35 - 6 57 53 0.11 173 0 0 - 7 25 54 23 29 50.2 4 111 75 - 7 28 39 - 7 23 8 - 7 30 45 - 7 21 2 0.11 174 0 0 - 7 48 59 23 29 50.6 5 111 76 - 7 51 45 - 7 46 14 - 7 53 51 - 7 44 8 0.10 175 0 0 - 8 12 1 23 29 51.1 7 110 76 - 8 14 46 - 8 9 16 - 8 16 52 - 8 7 10 0.10 176 0 0 - 8 34 57 23 29 51.6 8 110 77 - 8 37 42 - 8 32 12 - 8 39 48 - 8 30 6 0.10 177 0 0 - 8 57 48 23 29 52.3 9 110 77 - 9 0 33 - 8 55 3 - 9 2 39 - 8 52 58 0.10 178 0 0 - 9 20 33 23 29 53.0 10 110 78 - 9 23 18 - 9 17 48 - 9 25 24 - 9 15 43 0.09 179 0 0 - 9 43 12 23 29 53.8 11 110 78 - 9 45 57 - 9 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- 4 4 34 - 3 54 51 0.14 - 12 0 0 - 3 36 19 23 37 51.4 2 249 -74 - 3 39 4 - 3 33 33 - 3 41 10 - 3 31 27 0.16 - 11 0 0 - 3 12 56 23 37 51.6 1 249 -75 - 3 15 42 - 3 10 11 - 3 17 48 - 3 8 5 0.23 - 10 0 0 - 2 49 36 23 37 51.6 0 249 -76 - 2 52 22 - 2 46 51 - 2 54 28 - 2 44 45 1.10 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 345-087193 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 58 08.8251 DE: -21 03 30.915 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 58 08.8251 DE: -21 03 30.915 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3313) Mendel asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.34750 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 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): 0.017", 0.002", 84.038° remarks: * orbital elements for (3313)Mendel : Mean anomaly = 17.0117956539 deg Arg. of pericenter = 346.0435524963 deg Long. of node = 272.3037566137 deg Inclination = 11.3967615400 deg Eccentricity = 0.1310546554 Semimajor axis = 2.6551043105 AU Perihelion dist = 2.3071405300 AU Mag: H = 12.38, G = 0.15 Epoch of elements : MJD 60574.98183401 TDT (2024 Sep 21.9818) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr24,0.36,2024,9,21,23.564017,0.001868,-0.079780,14.879772,0.424789,0.005308,-0.000520,0.000000,0.000000 -99.8887,-21.0971,-175.28,0.21,False UCAC4 345-087193,16.96911813,-21.0585875,12.45,11.47,10.94,0.1,0,,16.99348499,-21.0970592,5.75,5.83,0,0,0 3313,Mendel,17.21,9.438,2.3475,0,0,3.984,1.60,,0.8,0 0,16.7881,2024,9,21,346.0436,272.3038,11.3968,0.13105,2.65510,2.30714,12.38,5.0,0.15 1.381,0.0173,0.0017,84,0.0021,Known errors,1.09,0,-1,-1 20240921_087193,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org