IOTA/IOTA-ES occultation update for (5284) Orsilocus / TYC 1969-00976-1 event on 2024 Nov 14, 07:43 UT Visible from Summary ------- On 2024 Nov 14 UT, the 50.0400724104266 km diameter asteroid (5284) Orsilocus will occult a 9.5 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.26 mag to 17.79 mag (the magnitude of the asteroid) for at most 2.780 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: 86 * date and approx. time of event: 2024 Nov 14, 07:38 - 2024 Nov 14, 07:49 * geocentric midpoint of event [JD]: 2460628.82200609 * magnitude of target star: 9.53 * magnitude drop [mag]: 8.26 * estimated maximum duration [s]: 2.780 * Moon: 96 % sunlit, 117° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.58 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.004", 98°) * approx speed of asteroid's shadow [km/s]: 18.0990 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1969-00976-1 by 5284 Orsilocus on 2024 Nov 14 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 - 88 0 0 -32 9 25 7 38 24.6 1 62 -32 -32 26 25 -31 52 28 -32 46 21 -31 32 41 .... - 87 0 0 -31 42 52 7 38 24.7 2 62 -32 -31 59 53 -31 25 54 -32 19 50 -31 6 7 0.21 - 86 0 0 -31 16 7 7 38 24.9 2 61 -31 -31 33 8 -30 59 8 -31 53 6 -30 39 20 0.31 - 85 0 0 -30 49 9 7 38 25.3 3 61 -31 -31 6 11 -30 32 9 -31 26 9 -30 12 21 0.35 - 84 0 0 -30 21 59 7 38 25.7 4 60 -31 -30 39 2 -30 5 0 -30 59 1 -29 45 10 0.38 - 83 0 0 -29 54 39 7 38 26.3 5 60 -31 -30 11 42 -29 37 39 -30 31 42 -29 17 49 0.39 - 82 0 0 -29 27 9 7 38 27.0 6 59 -31 -29 44 12 -29 10 8 -30 4 12 -28 50 18 0.40 - 81 0 0 -28 59 29 7 38 27.8 7 59 -30 -29 16 32 -28 42 28 -29 36 33 -28 22 37 0.41 - 80 0 0 -28 31 40 7 38 28.7 8 58 -30 -28 48 43 -28 14 39 -29 8 44 -27 54 48 0.42 - 79 0 0 -28 3 42 7 38 29.7 9 58 -30 -28 20 46 -27 46 41 -28 40 47 -27 26 50 0.42 - 78 0 0 -27 35 38 7 38 30.9 10 57 -30 -27 52 42 -27 18 37 -28 12 43 -26 58 46 0.43 - 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7 46 40 7 48 38.5 19 297 76 - 8 2 36 - 7 30 47 - 8 21 16 - 7 12 15 0.48 50 0 0 - 8 6 26 7 48 40.7 18 297 76 - 8 22 24 - 7 50 31 - 8 41 6 - 7 31 57 0.48 51 0 0 - 8 26 36 7 48 42.9 17 297 77 - 8 42 36 - 8 10 40 - 9 1 20 - 7 52 3 0.48 52 0 0 - 8 47 10 7 48 44.9 16 297 78 - 9 3 11 - 8 31 11 - 9 21 58 - 8 12 32 0.48 53 0 0 - 9 8 6 7 48 46.8 15 297 79 - 9 24 9 - 8 52 6 - 9 42 59 - 8 33 25 0.48 54 0 0 - 9 29 25 7 48 48.6 14 296 80 - 9 45 30 - 9 13 23 -10 4 22 - 8 54 39 0.48 55 0 0 - 9 51 6 7 48 50.2 13 296 81 -10 7 13 - 9 35 2 -10 26 7 - 9 16 16 0.48 56 0 0 -10 13 9 7 48 51.8 12 296 81 -10 29 18 - 9 57 3 -10 48 14 - 9 38 15 0.48 57 0 0 -10 35 33 7 48 53.2 11 296 82 -10 51 44 -10 19 25 -11 10 43 -10 0 35 0.48 58 0 0 -10 58 18 7 48 54.4 10 296 82 -11 14 31 -10 42 7 -11 33 32 -10 23 15 0.48 59 0 0 -11 21 23 7 48 55.6 9 295 83 -11 37 37 -11 5 10 -11 56 41 -10 46 16 0.48 60 0 0 -11 44 47 7 48 56.6 7 295 83 -12 1 4 -11 28 33 -12 20 9 -11 9 36 0.48 61 0 0 -12 8 31 7 48 57.4 6 295 83 -12 24 49 -11 52 14 -12 43 57 -11 33 15 0.48 62 0 0 -12 32 33 7 48 58.2 5 295 83 -12 48 53 -12 16 14 -13 8 3 -11 57 13 0.49 63 0 0 -12 56 52 7 48 58.8 4 295 83 -13 13 15 -12 40 32 -13 32 27 -12 21 29 0.49 64 0 0 -13 21 30 7 48 59.2 3 294 83 -13 37 54 -13 5 8 -13 57 8 -12 46 2 0.50 65 0 0 -13 46 24 7 48 59.6 2 294 82 -14 2 50 -13 30 0 -14 22 6 -13 10 52 0.51 66 0 0 -14 11 34 7 48 59.8 1 294 82 -14 28 2 -13 55 8 -14 47 20 -13 35 58 0.55 67 0 0 -14 36 59 7 48 59.9 0 294 81 .. .. .. -14 20 32 .. .. .. -14 1 20 1.61 Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 1969-00976-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 16 39.5765 DE: +22 56 37.000 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 16 39.5768 DE: +22 56 36.998 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.5 * B mag [mag]: 9.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5284) Orsilocus asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.014 distance from Earth [AU]: 4.92130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Apr 25 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): 0.025", 0.004", 97.831° remarks: * orbital elements for (5284)Orsilocus : Mean anomaly = 43.5572498278 deg Arg. of pericenter = 344.1469124536 deg Long. of node = 102.7461347574 deg Inclination = 20.2231518354 deg Eccentricity = 0.0846024701 Semimajor axis = 5.2262810818 AU Perihelion dist = 4.7841247928 AU Mag: H = 10.16, G = 0.15 Epoch of elements : MJD 60628.32200617 TDT (2024 Nov 14.3220) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr25,2.78,2024,11,14,7.728146,0.071147,-0.425921,10.067589,1.732583,-0.005581,0.002319,0.000000,0.000000 -15.3193,22.8193,60.20,-18.38,False TYC 1969-00976-1,10.27766012,22.9436112,9.75,9.53,9.41,0.1,0,,10.30053908,22.8192990,8.26,7.93,0,0,0 5284,Orsilocus,17.79,50.397,4.9213,0,0,1.302,3.09,,5.0,0 0,43.5307,2024,11,14,344.1469,102.7461,20.2232,0.08460,5.22628,4.78412,10.16,5.0,0.15 1.585,0.0247,0.0037,98,0.0082,Known errors,0.97,0,-1,-1 20241114_0976-1,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org