IOTA/IOTA-ES occultation update for (3845) Neyachenko / UCAC4 522-027783 event on 2024 Dec 19, 14:02 UT Visible from Summary ------- On 2024 Dec 19 UT, the 25.7810874874058 km diameter asteroid (3845) Neyachenko will occult a 9.7 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 6.49 mag to 16.22 mag (the magnitude of the asteroid) for at most 2.410 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 Dec 19, 13:53 - 2024 Dec 19, 14:11 * geocentric midpoint of event [JD]: 2460664.08506487 * magnitude of target star: 9.73 * magnitude drop [mag]: 6.49 * estimated maximum duration [s]: 2.410 * Moon: 80 % sunlit, 43° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.039, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.039", 0.004", 94°) * approx speed of asteroid's shadow [km/s]: 11.0687 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 522-027783 by 3845 Neyachenko on 2024 Dec 19 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 74 0 0 -23 22 45 14 11 16.0 0 74 -6 -23 14 32 .. .. .. -23 10 20 .. .. .. .... 75 0 0 -23 7 23 14 11 15.9 1 74 -6 -22 59 9 -23 15 37 -22 54 58 -23 19 49 0.12 76 0 0 -22 52 2 14 11 15.7 2 74 -7 -22 43 48 -23 0 16 -22 39 37 -23 4 28 0.29 77 0 0 -22 36 42 14 11 15.2 3 73 -8 -22 28 28 -22 44 55 -22 24 17 -22 49 7 0.34 78 0 0 -22 21 23 14 11 14.6 4 73 -9 -22 13 10 -22 29 37 -22 8 59 -22 33 49 0.37 79 0 0 -22 6 7 14 11 13.8 5 73 -10 -21 57 53 -22 14 20 -21 53 42 -22 18 32 0.39 80 0 0 -21 50 52 14 11 12.9 6 72 -11 -21 42 39 -21 59 6 -21 38 28 -22 3 18 0.40 81 0 0 -21 35 41 14 11 11.7 7 72 -12 -21 27 28 -21 43 54 -21 23 17 -21 48 6 0.41 82 0 0 -21 20 32 14 11 10.4 8 71 -13 -21 12 20 -21 28 46 -21 8 9 -21 32 57 0.41 83 0 0 -21 5 27 14 11 8.9 9 71 -14 -20 57 15 -21 13 40 -20 53 4 -21 17 51 0.42 84 0 0 -20 50 25 14 11 7.3 10 71 -15 -20 42 13 -20 58 38 -20 38 2 -21 2 49 0.42 85 0 0 -20 35 27 14 11 5.4 11 70 -16 -20 27 15 -20 43 40 -20 23 5 -20 47 51 0.42 86 0 0 -20 20 34 14 11 3.4 12 70 -17 -20 12 22 -20 28 46 -20 8 12 -20 32 57 0.43 87 0 0 -20 5 45 14 11 1.2 12 70 -18 -19 57 33 -20 13 57 -19 53 23 -20 18 8 0.43 88 0 0 -19 51 0 14 10 58.8 13 69 -18 -19 42 49 -19 59 12 -19 38 39 -20 3 23 0.43 89 0 0 -19 36 21 14 10 56.3 14 69 -19 -19 28 10 -19 44 33 -19 24 0 -19 48 44 0.43 90 0 0 -19 21 48 14 10 53.6 15 69 -20 -19 13 37 -19 29 59 -19 9 27 -19 34 10 0.43 91 0 0 -19 7 20 14 10 50.7 16 68 -21 -18 59 9 -19 15 31 -18 54 59 -19 19 41 0.43 92 0 0 -18 52 58 14 10 47.6 17 68 -22 -18 44 48 -19 1 9 -18 40 38 -19 5 19 0.44 93 0 0 -18 38 42 14 10 44.4 18 67 -23 -18 30 32 -18 46 53 -18 26 23 -18 51 3 0.44 94 0 0 -18 24 33 14 10 41.0 19 67 -24 -18 16 23 -18 32 44 -18 12 14 -18 36 54 0.44 95 0 0 -18 10 31 14 10 37.5 20 67 -25 -18 2 22 -18 18 41 -17 58 13 -18 22 51 0.44 96 0 0 -17 56 36 14 10 33.7 21 66 -26 -17 48 27 -18 4 46 -17 44 18 -18 8 56 0.44 97 0 0 -17 42 49 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56 -19 24 39 0.46 -129 0 0 -19 26 47 13 54 2.7 14 291 -1 -19 18 36 -19 34 59 -19 14 26 -19 39 10 0.46 -128 0 0 -19 41 23 13 54 0.1 13 291 0 -19 33 12 -19 49 35 -19 29 2 -19 53 46 0.46 -127 0 0 -19 56 5 13 53 57.8 12 290 1 -19 47 53 -20 4 17 -19 43 43 -20 8 28 0.46 -126 0 0 -20 10 51 13 53 55.6 11 290 2 -20 2 40 -20 19 4 -19 58 29 -20 23 15 0.46 -125 0 0 -20 25 42 13 53 53.6 10 290 3 -20 17 30 -20 33 55 -20 13 20 -20 38 6 0.47 -124 0 0 -20 40 38 13 53 51.8 10 289 4 -20 32 26 -20 48 51 -20 28 15 -20 53 2 0.47 -123 0 0 -20 55 38 13 53 50.1 9 289 5 -20 47 25 -21 3 51 -20 43 15 -21 8 2 0.47 -122 0 0 -21 10 41 13 53 48.6 8 288 6 -21 2 29 -21 18 54 -20 58 18 -21 23 6 0.47 -121 0 0 -21 25 48 13 53 47.3 7 288 7 -21 17 36 -21 34 2 -21 13 25 -21 38 13 0.47 -120 0 0 -21 40 58 13 53 46.2 6 288 8 -21 32 46 -21 49 12 -21 28 35 -21 53 24 0.47 -119 0 0 -21 56 11 13 53 45.3 5 287 9 -21 47 58 -22 4 25 -21 43 47 -22 8 37 0.48 -118 0 0 -22 11 27 13 53 44.5 4 287 10 -22 3 14 -22 19 41 -21 59 3 -22 23 53 0.48 -117 0 0 -22 26 45 13 53 43.9 3 287 10 -22 18 31 -22 34 59 -22 14 20 -22 39 11 0.49 -116 0 0 -22 42 4 13 53 43.5 2 286 11 -22 33 51 -22 50 18 -22 29 40 -22 54 30 0.52 -115 0 0 -22 57 26 13 53 43.2 1 286 12 -22 49 12 -23 5 40 -22 45 1 -23 9 52 0.58 Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 522-027783 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 35 23.4886 DE: +14 14 14.402 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 35 23.4886 DE: +14 14 14.402 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 9.7 * B mag [mag]: 11.4 * Diameter [mas]: 0.60 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3845) Neyachenko asteroid class: approx. diameter [km]: 26 approx. diameter ["]: 0.018 distance from Earth [AU]: 1.94390 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Apr 27 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): 0.039", 0.004", 93.83° remarks: * orbital elements for (3845)Neyachenko : Mean anomaly = 6.5310457645 deg Arg. of pericenter = 258.8660661035 deg Long. of node = 187.1115703209 deg Inclination = 5.9648239282 deg Eccentricity = 0.1557850554 Semimajor axis = 3.4390480538 AU Perihelion dist = 2.9032957623 AU Mag: H = 12.05, G = 0.15 Epoch of elements : MJD 60663.58506891 TDT (2024 Dec 19.5851) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr27,2.41,2024,12,19,14.041557,0.000700,-0.405399,-6.247470,-0.010747,-0.001088,0.000979,0.000001,0.000000 159.9223,14.2177,-31.28,-23.43,False UCAC4 522-027783,6.58985793,14.2373340,11.41,9.73,8.82,0.6,0,,6.61389304,14.2176807,6.49,6.95,0,0,0 3845,Neyachenko,16.22,26.627,1.9439,0,0,-1.944,-0.05,,2.2,0 0,6.4406,2024,12,19,258.8661,187.1116,5.9648,0.15579,3.43905,2.90330,12.05,5.0,0.15 1.255,0.0390,0.0040,94,0.0048,Known errors,0.95,0,-1,-1 20241219_027783,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org