IOTA/IOTA-ES occultation update for (2421) Nininger / UCAC4 304-211289 event on 2024 Jul 21, 12:04 UT Visible from Summary ------- On 2024 Jul 21 UT, the 41.075 km diameter asteroid (2421) Nininger will occult a 11.2 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 4.53 mag to 15.73 mag (the magnitude of the asteroid) for at most 3.940 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 Jul 21, 11:54 - 2024 Jul 21, 12:14 * geocentric midpoint of event [JD]: 2460513.00325037 * magnitude of target star: 11.22 * magnitude drop [mag]: 4.53 * estimated maximum duration [s]: 3.940 * Moon: 100 % sunlit, 26° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.001", 98°) * approx speed of asteroid's shadow [km/s]: 10.4323 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 304-211289 by 2421 Nininger on 2024 Jul 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 46 0 0 -26 55 24 12 14 16.2 1 123 24 -26 41 24 -27 9 26 -26 30 19 -27 20 34 .... 47 0 0 -27 30 26 12 14 15.9 2 122 23 -27 16 26 -27 44 27 -27 5 22 -27 55 34 0.34 48 0 0 -28 5 7 12 14 15.4 3 122 22 -27 51 9 -28 19 7 -27 40 5 -28 30 14 0.34 49 0 0 -28 39 29 12 14 14.7 4 122 21 -28 25 31 -28 53 28 -28 14 29 -29 4 33 0.34 50 0 0 -29 13 29 12 14 13.8 5 121 20 -28 59 33 -29 27 27 -28 48 32 -29 38 32 0.34 51 0 0 -29 47 8 12 14 12.7 6 121 19 -29 33 13 -30 1 5 -29 22 13 -30 12 8 0.34 52 0 0 -30 20 24 12 14 11.4 7 120 18 -30 6 31 -30 34 19 -29 55 31 -30 45 22 0.34 53 0 0 -30 53 17 12 14 9.9 8 120 17 -30 39 25 -31 7 11 -30 28 27 -31 18 12 0.34 54 0 0 -31 25 46 12 14 8.2 9 119 16 -31 11 56 -31 39 38 -31 0 59 -31 50 38 0.34 55 0 0 -31 57 51 12 14 6.3 10 118 15 -31 44 2 -32 11 42 -31 33 7 -32 22 40 0.34 56 0 0 -32 29 31 12 14 4.3 11 118 14 -32 15 44 -32 43 20 -32 4 49 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-36 -14 14 1 -14 41 42 -14 3 5 -14 52 41 0.36 -120 0 0 -13 51 29 11 55 19.8 12 242 -35 -13 37 40 -14 5 18 -13 26 45 -14 16 16 0.36 -119 0 0 -13 15 13 11 55 17.2 11 242 -34 -13 1 26 -13 29 1 -12 50 32 -13 39 58 0.37 -118 0 0 -12 39 5 11 55 14.9 10 242 -33 -12 25 19 -12 52 52 -12 14 26 -13 3 48 0.37 -117 0 0 -12 3 5 11 55 12.8 9 242 -32 -11 49 21 -12 16 51 -11 38 29 -12 27 46 0.38 -116 0 0 -11 27 16 11 55 10.9 8 241 -31 -11 13 33 -11 41 0 -11 2 42 -11 51 53 0.38 -115 0 0 -10 51 37 11 55 9.3 6 241 -30 -10 37 56 -11 5 19 -10 27 6 -11 16 12 0.39 -114 0 0 -10 16 11 11 55 8.0 5 241 -29 -10 2 31 -10 29 51 - 9 51 43 -10 40 42 0.40 -113 0 0 - 9 40 57 11 55 6.9 4 241 -27 - 9 27 20 - 9 54 36 - 9 16 33 -10 5 26 0.42 -112 0 0 - 9 5 58 11 55 6.1 3 241 -26 - 8 52 22 - 9 19 35 - 8 41 37 - 9 30 23 0.45 -111 0 0 - 8 31 15 11 55 5.5 2 241 -25 - 8 17 41 - 8 44 50 - 8 6 57 - 8 55 36 0.52 -110 0 0 - 7 56 47 11 55 5.2 1 240 -24 - 7 43 15 - 8 10 21 - 7 32 33 - 8 21 6 0.81 Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 304-211289 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 08.9093 DE: -29 23 33.153 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 18 08.9093 DE: -29 23 33.153 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2421) Nininger asteroid class: approx. diameter [km]: 41 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.25850 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.030", 0.001", 98.422° remarks: * orbital elements for (2421)Nininger : Mean anomaly = 285.2652390470 deg Arg. of pericenter = 284.1791406443 deg Long. of node = 77.3852197697 deg Inclination = 10.2067040410 deg Eccentricity = 0.0429972470 Semimajor axis = 3.2360756259 AU Perihelion dist = 3.0969332830 AU Mag: H = 10.87, G = 0.15 Epoch of elements : MJD 60512.50325100 TDT (2024 Jul 21.5033) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,3.94,2024,7,21,12.078009,0.064318,-0.330057,-5.779629,-1.125910,0.002344,0.000618,0.000001,0.000000 154.0147,-29.3837,0.45,20.31,False UCAC4 304-211289,18.30247481,-29.3925424,11.79,11.22,10.91,0.0,0,,18.32892114,-29.3837386,4.52,4.38,0,0,0 2421,Nininger,15.73,41.075,2.2585,0,0,-1.721,-4.38,,2.0,0 0,285.1800,2024,7,21,284.1791,77.3852,10.2067,0.04300,3.23608,3.09693,10.87,5.0,0.15 1.396,0.0297,0.0013,98,0.0099,Known errors,0.58,0,-1,-1 20240721_211289,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org