IOTA/IOTA-ES occultation update for (2364) Seillier / UCAC4 309-166970 event on 2024 Feb 13, 20:34 UT Visible from Summary ------- On 2024 Feb 13 UT, the 20.549 km diameter asteroid (2364) Seillier will occult a 11.7 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 5.51 mag to 17.16 mag (the magnitude of the asteroid) for at most 0.570 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 Feb 13, 20:31 - 2024 Feb 13, 20:37 * geocentric midpoint of event [JD]: 2460354.35706433 * magnitude of target star: 11.66 * magnitude drop [mag]: 5.51 * estimated maximum duration [s]: 0.570 * Moon: 20 % sunlit, 106° distance * Sun: 53° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.001", 97°) * approx speed of asteroid's shadow [km/s]: 35.9500 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 309-166970 by 2364 Seillier on 2024 Feb 13 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 85 0 0 -11 19 54 20 31 22.6 0 119 -52 -11 26 40 -11 13 8 -11 28 32 -11 11 16 .... 86 0 0 -11 52 53 20 31 22.7 1 119 -51 -11 59 39 -11 46 6 -12 1 31 -11 44 14 0.34 87 0 0 -12 26 3 20 31 22.8 3 118 -50 -12 32 50 -12 19 16 -12 34 43 -12 17 24 0.34 88 0 0 -12 59 24 20 31 23.0 4 118 -49 -13 6 12 -12 52 36 -13 8 4 -12 50 44 0.35 89 0 0 -13 32 54 20 31 23.3 5 118 -48 -13 39 43 -13 26 6 -13 41 36 -13 24 13 0.35 90 0 0 -14 6 33 20 31 23.7 6 118 -46 -14 13 23 -13 59 44 -14 15 16 -13 57 51 0.35 91 0 0 -14 40 20 20 31 24.1 7 118 -45 -14 47 10 -14 33 30 -14 49 3 -14 31 37 0.35 92 0 0 -15 14 13 20 31 24.6 8 117 -44 -15 21 3 -15 7 22 -15 22 57 -15 5 29 0.35 93 0 0 -15 48 11 20 31 25.1 9 117 -43 -15 55 2 -15 41 20 -15 56 56 -15 39 27 0.35 94 0 0 -16 22 14 20 31 25.8 10 117 -42 -16 29 5 -16 15 22 -16 30 59 -16 13 29 0.35 95 0 0 -16 56 20 20 31 26.5 12 116 -41 -17 3 12 -16 49 28 -17 5 5 -16 47 35 0.35 96 0 0 -17 30 28 20 31 27.2 13 116 -40 -17 37 20 -17 23 36 -17 39 14 -17 21 42 0.35 97 0 0 -18 4 37 20 31 28.1 14 116 -39 -18 11 30 -17 57 45 -18 13 24 -17 55 51 0.35 98 0 0 -18 38 46 20 31 29.0 15 115 -38 -18 45 40 -18 31 54 -18 47 34 -18 30 0 0.35 99 0 0 -19 12 55 20 31 29.9 16 115 -36 -19 19 48 -19 6 2 -19 21 42 -19 4 8 0.35 100 0 0 -19 47 1 20 31 30.9 17 115 -35 -19 53 54 -19 40 7 -19 55 48 -19 38 14 0.35 101 0 0 -20 21 4 20 31 32.0 18 114 -34 -20 27 57 -20 14 10 -20 29 51 -20 12 16 0.35 102 0 0 -20 55 2 20 31 33.2 19 114 -33 -21 1 56 -20 48 8 -21 3 50 -20 46 15 0.35 103 0 0 -21 28 55 20 31 34.4 20 114 -32 -21 35 49 -21 22 1 -21 37 43 -21 20 8 0.35 104 0 0 -22 2 42 20 31 35.7 21 113 -31 -22 9 36 -21 55 48 -22 11 30 -21 53 54 0.35 105 0 0 -22 36 21 20 31 37.0 22 113 -30 -22 43 15 -22 29 27 -22 45 9 -22 27 33 0.35 106 0 0 -23 9 52 20 31 38.4 24 112 -29 -23 16 46 -23 2 58 -23 18 40 -23 1 4 0.35 107 0 0 -23 43 13 20 31 39.9 25 112 -28 -23 50 7 -23 36 20 -23 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241 48 -25 26 58 -25 13 13 -25 28 52 -25 11 19 0.42 - 82 0 0 -24 47 28 20 36 57.2 4 241 47 -24 54 21 -24 40 35 -24 56 15 -24 38 42 0.43 - 81 0 0 -24 14 39 20 36 57.5 3 240 46 -24 21 32 -24 7 46 -24 23 26 -24 5 52 0.46 - 80 0 0 -23 41 38 20 36 57.6 2 240 46 -23 48 31 -23 34 45 -23 50 25 -23 32 51 0.51 - 79 0 0 -23 8 27 20 36 57.7 1 240 45 -23 15 21 -23 1 34 -23 17 15 -22 59 41 0.64 - 78 0 0 -22 35 7 20 36 57.8 0 239 44 -22 42 1 -22 28 14 -22 43 55 -22 26 20 2.06 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 309-166970 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 06 29.8394 DE: -28 22 46.505 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 06 29.8394 DE: -28 22 46.505 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2364) Seillier asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.31790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.020", 0.001", 97.428° remarks: * orbital elements for (2364)Seillier : Mean anomaly = 34.8824579725 deg Arg. of pericenter = 167.4109777034 deg Long. of node = 42.7827982191 deg Inclination = 10.7059193574 deg Eccentricity = 0.1397993517 Semimajor axis = 3.1759529715 AU Perihelion dist = 2.7319568052 AU Mag: H = 11.43, G = 0.15 Epoch of elements : MJD 60353.85706425 TDT (2024 Feb 13.8571) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.57,2024,2,13,20.569544,-0.036302,-0.325297,20.161705,-2.288714,-0.004750,-0.000373,-0.000001,0.000000 -179.9218,-28.3775,-125.00,-13.31,False UCAC4 309-166970,18.10828866,-28.3795847,11.87,11.66,11.55,0.0,0,,18.13337255,-28.3774867,5.51,5.17,0,0,0 2364,Seillier,17.16,20.549,3.3179,0,0,4.049,-6.06,,1.2,0 0,34.7332,2024,2,13,167.4110,42.7828,10.7059,0.13980,3.17595,2.73196,11.42,5.0,0.15 1.138,0.0200,0.0011,97,0.0012,Known errors,0.55,0,-1,-1 20240213_166970,60138.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org