IOTA/IOTA-ES occultation update for (21900) Orus / UCAC4 542-031711 event on 2024 Mar 28, 07:26 UT Visible from Summary ------- On 2024 Mar 28 UT, the 49.6538545676536 km diameter asteroid (21900) Orus will occult a 11.2 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.46 mag to 17.67 mag (the magnitude of the asteroid) for at most 4.350 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 Mar 28, 07:19 - 2024 Mar 28, 07:33 * geocentric midpoint of event [JD]: 2460397.81011696 * magnitude of target star: 11.21 * magnitude drop [mag]: 6.46 * estimated maximum duration [s]: 4.350 * Moon: 92 % sunlit, 120° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.001", 102°) * approx speed of asteroid's shadow [km/s]: 11.4968 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 542-031711 by 21900 Orus on 2024 Mar 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 90 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -38 16 52 .. .. .. -38 5 45 .... 91 0 0 -38 16 5 7 19 44.3 1 66 45 -38 35 56 -37 56 20 -38 47 12 -37 45 14 .... 92 0 0 -37 55 35 7 19 44.5 2 65 45 -38 15 24 -37 35 52 -38 26 40 -37 24 46 0.56 93 0 0 -37 35 8 7 19 44.9 3 65 45 -37 54 57 -37 15 26 -38 6 11 -37 4 22 0.67 94 0 0 -37 14 46 7 19 45.5 3 64 44 -37 34 33 -36 55 6 -37 45 47 -36 44 2 0.73 95 0 0 -36 54 28 7 19 46.2 4 63 44 -37 14 14 -36 34 49 -37 25 27 -36 23 46 0.76 96 0 0 -36 34 16 7 19 47.2 5 63 44 -36 54 0 -36 14 38 -37 5 12 -36 3 36 0.78 97 0 0 -36 14 9 7 19 48.3 6 62 44 -36 33 52 -35 54 33 -36 45 3 -35 43 32 0.80 98 0 0 -35 54 9 7 19 49.6 7 62 44 -36 13 50 -35 34 34 -36 25 0 -35 23 34 0.81 99 0 0 -35 34 15 7 19 51.0 8 61 43 -35 53 55 -35 14 42 -36 5 4 -35 3 43 0.82 100 0 0 -35 14 29 7 19 52.7 9 60 43 -35 34 7 -34 54 58 -35 45 15 -34 43 59 0.83 101 0 0 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Uncertainty in time = +/- 6 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 542-031711 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 42 45.0468 DE: +18 15 13.039 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 42 45.0468 DE: +18 15 13.039 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.2 * B mag [mag]: 11.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (21900) Orus asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.014 distance from Earth [AU]: 4.81400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#37 date of fit: 2019 Oct 14 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): 0.020", 0.001", 102.1° remarks: * orbital elements for (21900)Orus : Mean anomaly = 29.2310410865 deg Arg. of pericenter = 182.1324928916 deg Long. of node = 258.5542304386 deg Inclination = 8.4687978720 deg Eccentricity = 0.0376967044 Semimajor axis = 5.1237934363 AU Perihelion dist = 4.9306433099 AU Mag: H = 10.07, G = 0.15 Epoch of elements : MJD 60397.31011679 TDT (2024 Mar 28.3101) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#372019Oct14,4.35,2024,3,28,7.442807,-0.016908,-0.671694,6.487086,-0.162034,0.005950,-0.000432,0.000000,0.000000 163.1905,18.2303,69.60,3.22,False UCAC4 542-031711,6.71251302,18.2536219,11.92,11.21,10.83,0.1,0,,6.73605781,18.2303384,6.46,6.40,0,0,0 21900,Orus,17.67,50.003,4.8140,0,0,0.832,-0.30,,4.0,0 0,29.2047,2024,3,28,182.1325,258.5542,8.4688,0.03770,5.12379,4.93064,10.07,5.0,0.15 1.282,0.0203,0.0015,102,0.0040,Known errors,1.03,0,-1,-1 20240328_031711,60139.26 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org