IOTA/IOTA-ES occultation update for (16563) Ob / UCAC4 509-023288 event on 2024 Sep 18, 07:56 UT Visible from Summary ------- On 2024 Sep 18 UT, the 15.5276245728705 km diameter asteroid (16563) Ob will occult a 9.1 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 9.29 mag to 18.42 mag (the magnitude of the asteroid) for at most 0.720 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: 69 * date and approx. time of event: 2024 Sep 18, 07:52 - 2024 Sep 18, 08:00 * geocentric midpoint of event [JD]: 2460571.83105958 * magnitude of target star: 9.13 * magnitude drop [mag]: 9.29 * estimated maximum duration [s]: 0.720 * Moon: 100 % sunlit, 97° distance * Sun: 80° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.86 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 22.0024 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 509-023288 by 16563 Ob on 2024 Sep 18 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 -105 0 0 -21 26 31 7 52 39.4 1 77 -66 -21 31 45 -21 21 16 -21 40 49 -21 12 15 .... -104 0 0 -21 14 21 7 52 39.5 2 77 -65 -21 19 36 -21 9 7 -21 28 38 -21 0 6 0.39 -103 0 0 -21 2 26 7 52 39.7 3 77 -65 -21 7 40 -20 57 12 -21 16 42 -20 48 12 0.48 -102 0 0 -20 50 45 7 52 40.0 3 76 -64 -20 55 59 -20 45 31 -21 5 1 -20 36 31 0.52 -101 0 0 -20 39 19 7 52 40.4 4 76 -64 -20 44 32 -20 34 5 -20 53 34 -20 25 6 0.55 -100 0 0 -20 28 7 7 52 40.9 5 76 -63 -20 33 21 -20 22 54 -20 42 22 -20 13 55 0.56 - 99 0 0 -20 17 11 7 52 41.5 6 75 -63 -20 22 24 -20 11 58 -20 31 25 -20 3 0 0.57 - 98 0 0 -20 6 31 7 52 42.2 7 75 -62 -20 11 43 -20 1 18 -20 20 43 -19 52 20 0.58 - 97 0 0 -19 56 6 7 52 42.9 8 74 -61 -20 1 18 -19 50 53 -20 10 18 -19 41 56 0.59 - 96 0 0 -19 45 56 7 52 43.8 9 74 -61 -19 51 9 -19 40 44 -20 0 8 -19 31 47 0.59 - 95 0 0 -19 36 3 7 52 44.8 10 74 -60 -19 41 16 -19 30 52 -19 50 14 -19 21 55 0.60 - 94 0 0 -19 26 27 7 52 45.9 11 73 -59 -19 31 39 -19 21 15 -19 40 37 -19 12 19 0.60 - 93 0 0 -19 17 7 7 52 47.0 12 73 -58 -19 22 19 -19 11 56 -19 31 17 -19 2 59 0.61 - 92 0 0 -19 8 4 7 52 48.3 13 73 -58 -19 13 15 -19 2 53 -19 22 13 -18 53 57 0.61 - 91 0 0 -18 59 17 7 52 49.6 14 72 -57 -19 4 29 -18 54 7 -19 13 26 -18 45 11 0.61 - 90 0 0 -18 50 48 7 52 51.1 15 72 -56 -18 55 59 -18 45 38 -19 4 56 -18 36 43 0.61 - 89 0 0 -18 42 37 7 52 52.6 16 72 -55 -18 47 48 -18 37 26 -18 56 44 -18 28 32 0.61 - 88 0 0 -18 34 43 7 52 54.2 17 71 -55 -18 39 53 -18 29 32 -18 48 49 -18 20 38 0.62 - 87 0 0 -18 27 6 7 52 55.9 18 71 -54 -18 32 17 -18 21 56 -18 41 13 -18 13 2 0.62 - 86 0 0 -18 19 48 7 52 57.8 19 70 -53 -18 24 58 -18 14 38 -18 33 54 -18 5 44 0.62 - 85 0 0 -18 12 47 7 52 59.7 20 70 -52 -18 17 57 -18 7 38 -18 26 53 -17 58 44 0.62 - 84 0 0 -18 6 5 7 53 1.7 21 70 -51 -18 11 15 -18 0 56 -18 20 10 -17 52 3 0.62 - 83 0 0 -17 59 41 7 53 3.7 22 69 -50 -18 4 51 -17 54 32 -18 13 46 -17 45 39 0.62 - 82 0 0 -17 53 36 7 53 5.9 22 69 -50 -17 58 46 -17 48 27 -18 7 40 -17 39 34 0.62 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 509-023288 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 21 02.2451 DE: +11 36 06.702 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 21 02.2452 DE: +11 36 06.702 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.1 * B mag [mag]: 9.9 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (16563) Ob asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.84980 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 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): 0.023", 0.002", 84.821° remarks: * orbital elements for (16563)Ob : Mean anomaly = 339.7121959005 deg Arg. of pericenter = 315.0477232082 deg Long. of node = 143.5552849858 deg Inclination = 12.5020844574 deg Eccentricity = 0.0943112649 Semimajor axis = 3.1345117663 AU Perihelion dist = 2.8388919966 AU Mag: H = 12.86, G = 0.15 Epoch of elements : MJD 60571.33105883 TDT (2024 Sep 18.3311) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr27,0.72,2024,9,18,7.945430,-0.099534,-0.529024,12.204144,-2.298853,-0.005593,0.000027,0.000000,0.000000 -21.3111,11.5927,59.33,1.63,False UCAC4 509-023288,6.35062362,11.6018617,9.89,9.13,8.72,0.2,0,,6.37351756,11.5927201,9.29,9.26,0,0,0 16563,Ob,18.42,15.941,2.8498,0,0,2.563,-7.10,,1.6,0 0,339.6534,2024,9,18,315.0477,143.5553,12.5021,0.09431,3.13451,2.83889,12.86,5.0,0.15 1.862,0.0227,0.0024,85,0.0066,Known errors,1.11,0,-1,-1 20240918_023288,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org