IOTA/IOTA-ES occultation update for (2188) Orlenok / UCAC4 340-119136 event on 2024 Oct 04, 12:56 UT Visible from Summary ------- On 2024 Oct 04 UT, the 14.295 km diameter asteroid (2188) Orlenok 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 5.52 mag to 17.22 mag (the magnitude of the asteroid) for at most 0.610 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 Oct 04, 12:51 - 2024 Oct 04, 13:00 * geocentric midpoint of event [JD]: 2460588.03892266 * magnitude of target star: 11.71 * magnitude drop [mag]: 5.52 * estimated maximum duration [s]: 0.610 * Moon: 3 % sunlit, 59° distance * Sun: 78° 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]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 23.5481 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 340-119136 by 2188 Orlenok on 2024 Oct 4 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 - 21 0 0 10 57 27 12 51 35.6 1 113 74 10 53 12 11 1 42 10 49 17 11 5 38 .... - 20 0 0 10 32 42 12 51 35.7 2 113 74 10 28 27 10 36 57 10 24 32 10 40 53 -0.04 - 19 0 0 10 7 54 12 51 35.9 3 113 75 10 3 39 10 12 9 9 59 44 10 16 4 -0.08 - 18 0 0 9 43 3 12 51 36.3 4 113 75 9 38 48 9 47 18 9 34 53 9 51 13 -0.10 - 17 0 0 9 18 10 12 51 36.7 5 113 76 9 13 54 9 22 25 9 9 59 9 26 20 -0.11 - 16 0 0 8 53 15 12 51 37.2 6 114 76 8 49 0 8 57 30 8 45 4 9 1 25 -0.12 - 15 0 0 8 28 19 12 51 37.8 7 114 77 8 24 4 8 32 34 8 20 9 8 36 29 -0.12 - 14 0 0 8 3 23 12 51 38.5 8 114 77 7 59 8 8 7 38 7 55 12 8 11 33 -0.13 - 13 0 0 7 38 27 12 51 39.3 9 114 77 7 34 12 7 42 42 7 30 17 7 46 37 -0.13 - 12 0 0 7 13 32 12 51 40.2 11 114 78 7 9 17 7 17 47 7 5 22 7 21 42 -0.13 - 11 0 0 6 48 38 12 51 41.2 12 114 78 6 44 23 6 52 53 6 40 28 6 56 48 -0.13 - 10 0 0 6 23 47 12 51 42.3 13 114 78 6 19 32 6 28 2 6 15 37 6 31 57 -0.14 - 9 0 0 5 58 58 12 51 43.4 14 115 77 5 54 44 6 3 13 5 50 49 6 7 8 -0.14 - 8 0 0 5 34 13 12 51 44.7 15 115 77 5 29 59 5 38 28 5 26 4 5 42 23 -0.14 - 7 0 0 5 9 32 12 51 46.1 16 115 77 5 5 18 5 13 47 5 1 23 5 17 41 -0.14 - 6 0 0 4 44 56 12 51 47.6 17 115 76 4 40 42 4 49 10 4 36 47 4 53 5 -0.14 - 5 0 0 4 20 25 12 51 49.1 18 115 76 4 16 11 4 24 39 4 12 16 4 28 33 -0.14 - 4 0 0 3 55 59 12 51 50.8 19 115 75 3 51 45 4 0 13 3 47 51 4 4 8 -0.14 - 3 0 0 3 31 41 12 51 52.5 20 115 75 3 27 27 3 35 54 3 23 33 3 39 48 -0.14 - 2 0 0 3 7 29 12 51 54.4 21 115 74 3 3 15 3 11 42 2 59 22 3 15 36 -0.14 - 1 0 0 2 43 25 12 51 56.3 22 115 73 2 39 11 2 47 38 2 35 18 2 51 32 -0.14 0 0 0 2 19 29 12 51 58.3 24 115 73 2 15 16 2 23 42 2 11 23 2 27 36 -0.15 1 0 0 1 55 42 12 52 0.4 25 115 72 1 51 29 1 59 55 1 47 36 2 3 49 -0.15 2 0 0 1 32 5 12 52 2.6 26 116 71 1 27 52 1 36 17 1 23 59 1 40 11 -0.15 3 0 0 1 8 37 12 52 4.9 27 116 70 1 4 25 1 12 50 1 0 32 1 16 43 -0.15 4 0 0 0 45 20 12 52 7.3 28 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 340-119136 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 58 58.1916 DE: -22 08 36.022 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 58 58.1915 DE: -22 08 36.022 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2188) Orlenok asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.73250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.016", 0.003", 90.859° remarks: * orbital elements for (2188)Orlenok : Mean anomaly = 322.4659196984 deg Arg. of pericenter = 194.7587618158 deg Long. of node = 140.2673419034 deg Inclination = 2.6620623047 deg Eccentricity = 0.0864451601 Semimajor axis = 2.9029115714 AU Perihelion dist = 2.6519689159 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 60587.53892234 TDT (2024 Oct 04.5389) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.61,2024,10,4,12.934144,0.008151,0.158246,13.272687,-0.701127,0.005628,0.000032,0.000000,0.000000 62.3940,-22.1461,-16.87,-4.66,False UCAC4 340-119136,17.98283103,-22.1433395,12.44,11.71,11.32,0.0,0,,18.00757394,-22.1460595,5.51,5.46,0,0,0 2188,Orlenok,17.22,14.295,2.7325,0,0,3.075,-2.25,,1.0,0 0,322.3585,2024,10,4,194.7588,140.2673,2.6621,0.08645,2.90291,2.65197,11.83,5.0,0.15 1.461,0.0160,0.0033,91,0.0033,Known errors,1.66,0,-1,-1 20241004_119136,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org