IOTA/IOTA-ES occultation update for (2400) Derevskaya / UCAC4 382-073058 event on 2024 Jan 20, 07:43 UT Visible from Summary ------- On 2024 Jan 20 UT, the 13.4934450165569 km diameter asteroid (2400) Derevskaya will occult a 11.9 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.13 mag to 18.02 mag (the magnitude of the asteroid) for at most 0.380 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: 94 * date and approx. time of event: 2024 Jan 20, 07:40 - 2024 Jan 20, 07:46 * geocentric midpoint of event [JD]: 2460329.82201054 * magnitude of target star: 11.89 * magnitude drop [mag]: 6.13 * estimated maximum duration [s]: 0.380 * Moon: 73 % sunlit, 166° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 35.7355 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 382-073058 by 2400 Derevskaya on 2024 Jan 20 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 - 82 0 0 -14 38 6 7 40 51.5 0 104 -44 -14 42 9 -14 34 4 -14 45 54 -14 30 19 .... - 81 0 0 -14 53 2 7 40 51.6 1 104 -43 -14 57 5 -14 49 0 -15 0 51 -14 45 15 0.27 - 80 0 0 -15 8 2 7 40 51.7 2 104 -42 -15 12 4 -15 3 59 -15 15 50 -15 0 14 0.29 - 79 0 0 -15 23 4 7 40 51.9 3 103 -42 -15 27 6 -15 19 1 -15 30 52 -15 15 16 0.30 - 78 0 0 -15 38 9 7 40 52.1 4 103 -41 -15 42 11 -15 34 6 -15 45 57 -15 30 20 0.31 - 77 0 0 -15 53 16 7 40 52.3 5 103 -40 -15 57 18 -15 49 13 -16 1 4 -15 45 27 0.31 - 76 0 0 -16 8 24 7 40 52.7 6 103 -39 -16 12 27 -16 4 22 -16 16 13 -16 0 36 0.31 - 75 0 0 -16 23 35 7 40 53.1 7 102 -38 -16 27 38 -16 19 32 -16 31 24 -16 15 47 0.31 - 74 0 0 -16 38 47 7 40 53.5 8 102 -37 -16 42 50 -16 34 44 -16 46 36 -16 30 58 0.31 - 73 0 0 -16 54 0 7 40 54.0 9 102 -36 -16 58 3 -16 49 57 -17 1 49 -16 46 11 0.31 - 72 0 0 -17 9 13 7 40 54.6 10 101 -35 -17 13 16 -17 5 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25.7 14 261 68 -23 32 0 -23 23 57 -23 35 45 -23 20 12 0.34 91 0 0 -23 14 18 7 46 26.5 13 260 67 -23 18 20 -23 10 16 -23 22 5 -23 6 31 0.34 92 0 0 -23 0 30 7 46 27.2 12 260 66 -23 4 32 -22 56 28 -23 8 17 -22 52 44 0.34 93 0 0 -22 46 36 7 46 27.8 11 260 65 -22 50 38 -22 42 34 -22 54 23 -22 38 49 0.34 94 0 0 -22 32 35 7 46 28.4 11 259 64 -22 36 38 -22 28 33 -22 40 23 -22 24 48 0.34 95 0 0 -22 18 29 7 46 29.0 10 259 63 -22 22 31 -22 14 26 -22 26 16 -22 10 41 0.35 96 0 0 -22 4 16 7 46 29.5 9 259 62 -22 8 18 -22 0 14 -22 12 4 -21 56 29 0.35 97 0 0 -21 49 58 7 46 29.9 8 258 61 -21 54 0 -21 45 55 -21 57 46 -21 42 10 0.35 98 0 0 -21 35 34 7 46 30.3 7 258 60 -21 39 37 -21 31 32 -21 43 22 -21 27 47 0.36 99 0 0 -21 21 6 7 46 30.7 6 257 59 -21 25 8 -21 17 3 -21 28 54 -21 13 18 0.37 100 0 0 -21 6 32 7 46 30.9 5 257 58 -21 10 35 -21 2 30 -21 14 20 -20 58 44 0.37 101 0 0 -20 51 54 7 46 31.2 4 257 57 -20 55 57 -20 47 52 -20 59 43 -20 44 6 0.39 102 0 0 -20 37 12 7 46 31.4 3 256 56 -20 41 15 -20 33 10 -20 45 1 -20 29 24 0.41 103 0 0 -20 22 26 7 46 31.5 2 256 55 -20 26 29 -20 18 23 -20 30 15 -20 14 38 0.46 104 0 0 -20 7 36 7 46 31.6 1 256 54 -20 11 39 -20 3 34 -20 15 25 -19 59 48 0.60 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 382-073058 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 21 27.8029 DE: -13 45 46.378 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 21 27.8029 DE: -13 45 46.378 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2400) Derevskaya asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.38570 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): 0.015", 0.002", 96.016° remarks: * orbital elements for (2400)Derevskaya : Mean anomaly = 292.2451807974 deg Arg. of pericenter = 137.4766461680 deg Long. of node = 171.6774674782 deg Inclination = 10.4037034710 deg Eccentricity = 0.0996036679 Semimajor axis = 3.0024923625 AU Perihelion dist = 2.7034331105 AU Mag: H = 12.19, G = 0.15 Epoch of elements : MJD 60329.32201054 TDT (2024 Jan 20.3220) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,0.38,2024,1,20,7.728253,-0.013774,-0.302653,20.146998,-0.965169,-0.004673,0.001256,-0.000001,0.000000 10.5788,-13.8202,66.78,-20.21,False UCAC4 382-073058,16.35772299,-13.7628825,12.77,11.89,11.41,0.1,0,,16.37991719,-13.8202463,6.14,6.16,0,0,0 2400,Derevskaya,18.02,13.739,3.3857,0,0,3.594,-2.51,,2.4,0 0,292.1842,2024,1,20,137.4766,171.6775,10.4037,0.09960,3.00249,2.70343,12.19,5.0,0.15 1.465,0.0153,0.0024,96,0.0026,Known errors,0.99,0,-1,-1 20240120_073058,60137.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org