IOTA/IOTA-ES occultation update for (25295) 1998 WK17 / UCAC4 348-129168 event on 2024 Mar 08, 05:26 UT Visible from Summary ------- On 2024 Mar 08 UT, the 15.507 km diameter asteroid (25295) 1998 WK17 will occult a 11.8 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 6.88 mag to 18.70 mag (the magnitude of the asteroid) for at most 0.660 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 Mar 08, 05:21 - 2024 Mar 08, 05:30 * geocentric midpoint of event [JD]: 2460377.72642245 * magnitude of target star: 11.82 * magnitude drop [mag]: 6.88 * estimated maximum duration [s]: 0.660 * Moon: 7 % sunlit, 48° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.001", 68°) * approx speed of asteroid's shadow [km/s]: 23.3763 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 348-129168 by 25295 1998 WK17 on 2024 Mar 8 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 - 84 0 0 -40 25 26 5 21 54.5 0 117 -45 -40 30 38 -40 20 14 -40 32 28 -40 18 24 .... - 83 0 0 -40 48 57 5 21 54.5 1 117 -44 -40 54 8 -40 43 46 -40 55 59 -40 41 56 0.42 - 82 0 0 -41 12 5 5 21 54.6 2 116 -44 -41 17 15 -41 6 55 -41 19 5 -41 5 5 0.44 - 81 0 0 -41 34 48 5 21 54.8 3 115 -44 -41 39 58 -41 29 39 -41 41 48 -41 27 49 0.45 - 80 0 0 -41 57 7 5 21 55.1 3 115 -43 -42 2 16 -41 51 59 -42 4 6 -41 50 9 0.45 - 79 0 0 -42 19 2 5 21 55.4 4 114 -43 -42 24 10 -42 13 54 -42 25 59 -42 12 5 0.45 - 78 0 0 -42 40 32 5 21 55.7 5 113 -43 -42 45 39 -42 35 25 -42 47 28 -42 33 36 0.45 - 77 0 0 -43 1 38 5 21 56.1 6 113 -42 -43 6 44 -42 56 31 -43 8 33 -42 54 43 0.45 - 76 0 0 -43 22 18 5 21 56.6 7 112 -42 -43 27 24 -43 17 13 -43 29 12 -43 15 25 0.45 - 75 0 0 -43 42 35 5 21 57.1 8 111 -42 -43 47 39 -43 37 30 -43 49 27 -43 35 42 0.45 - 74 0 0 -44 2 26 5 21 57.7 8 111 -41 -44 7 30 -43 57 22 -44 9 18 -43 55 35 0.45 - 73 0 0 -44 21 53 5 21 58.3 9 110 -41 -44 26 56 -44 16 50 -44 28 43 -44 15 2 0.45 - 72 0 0 -44 40 55 5 21 59.0 10 109 -40 -44 45 57 -44 35 52 -44 47 44 -44 34 5 0.45 - 71 0 0 -44 59 32 5 21 59.7 11 108 -40 -45 4 33 -44 54 31 -45 6 20 -44 52 44 0.45 - 70 0 0 -45 17 44 5 22 0.5 11 108 -40 -45 22 45 -45 12 44 -45 24 32 -45 10 57 0.45 - 69 0 0 -45 35 32 5 22 1.3 12 107 -39 -45 40 32 -45 30 33 -45 42 18 -45 28 46 0.45 - 68 0 0 -45 52 55 5 22 2.2 13 106 -39 -45 57 54 -45 47 57 -45 59 40 -45 46 11 0.45 - 67 0 0 -46 9 54 5 22 3.1 14 105 -38 -46 14 52 -46 4 56 -46 16 38 -46 3 11 0.45 - 66 0 0 -46 26 29 5 22 4.1 14 105 -38 -46 31 26 -46 21 31 -46 33 11 -46 19 46 0.45 - 65 0 0 -46 42 38 5 22 5.1 15 104 -37 -46 47 35 -46 37 42 -46 49 20 -46 35 57 0.45 - 64 0 0 -46 58 24 5 22 6.1 16 103 -37 -47 3 20 -46 53 29 -47 5 5 -46 51 44 0.45 - 63 0 0 -47 13 45 5 22 7.2 17 102 -37 -47 18 40 -47 8 51 -47 20 25 -47 7 6 0.45 - 62 0 0 -47 28 43 5 22 8.3 17 102 -36 -47 33 37 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4 6 -49 51 13 0.45 - 49 0 0 -50 7 35 5 22 25.8 26 91 -30 -50 12 20 -50 2 51 -50 14 1 -50 1 10 0.45 - 48 0 0 -50 17 9 5 22 27.4 27 90 -29 -50 21 54 -50 12 25 -50 23 34 -50 10 45 0.45 - 47 0 0 -50 26 21 5 22 28.9 27 90 -29 -50 31 5 -50 21 38 -50 32 45 -50 19 57 0.45 - 46 0 0 -50 35 11 5 22 30.6 28 89 -28 -50 39 54 -50 30 28 -50 41 34 -50 28 48 0.45 - 45 0 0 -50 43 39 5 22 32.2 29 88 -28 -50 48 22 -50 38 57 -50 50 2 -50 37 17 0.45 - 44 0 0 -50 51 45 5 22 33.8 29 87 -27 -50 56 27 -50 47 4 -50 58 7 -50 45 24 0.45 - 43 0 0 -50 59 30 5 22 35.5 30 86 -27 -51 4 12 -50 54 49 -51 5 51 -50 53 9 0.45 - 42 0 0 -51 6 53 5 22 37.2 31 85 -26 -51 11 34 -51 2 13 -51 13 14 -51 0 33 0.45 - 41 0 0 -51 13 55 5 22 39.0 31 84 -26 -51 18 36 -51 9 15 -51 20 15 -51 7 36 0.45 - 40 0 0 -51 20 36 5 22 40.7 32 83 -25 -51 25 16 -51 15 56 -51 26 55 -51 14 17 0.45 - 39 0 0 -51 26 56 5 22 42.5 32 83 -25 -51 31 35 -51 22 16 -51 33 14 -51 20 37 0.45 - 38 0 0 -51 32 54 5 22 44.3 33 82 -24 -51 37 33 -51 28 15 -51 39 12 -51 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29 -11 5 10 -11 17 19 -11 3 21 0.48 100 0 0 -10 41 31 5 30 1.2 15 251 84 -10 46 39 -10 36 22 -10 48 29 -10 34 33 0.49 101 0 0 -10 13 4 5 30 2.6 14 251 84 -10 18 12 -10 7 57 -10 20 1 -10 6 8 0.49 102 0 0 - 9 45 0 5 30 3.9 13 251 85 - 9 50 7 - 9 39 53 - 9 51 56 - 9 38 4 0.49 103 0 0 - 9 17 19 5 30 5.2 12 251 85 - 9 22 25 - 9 12 13 - 9 24 13 - 9 10 24 0.49 104 0 0 - 8 50 1 5 30 6.3 11 251 84 - 8 55 6 - 8 44 56 - 8 56 55 - 8 43 8 0.50 105 0 0 - 8 23 8 5 30 7.3 10 250 84 - 8 28 12 - 8 18 4 - 8 30 0 - 8 16 16 0.50 106 0 0 - 7 56 40 5 30 8.2 9 250 83 - 8 1 43 - 7 51 36 - 8 3 31 - 7 49 49 0.51 107 0 0 - 7 30 36 5 30 9.0 8 250 83 - 7 35 39 - 7 25 34 - 7 37 26 - 7 23 47 0.51 108 0 0 - 7 4 59 5 30 9.7 6 250 82 - 7 10 1 - 6 59 57 - 7 11 48 - 6 58 10 0.52 109 0 0 - 6 39 48 5 30 10.3 5 250 81 - 6 44 49 - 6 34 47 - 6 46 36 - 6 33 1 0.53 110 0 0 - 6 15 4 5 30 10.8 4 250 80 - 6 20 4 - 6 10 4 - 6 21 50 - 6 8 18 0.55 111 0 0 - 5 50 47 5 30 11.1 3 250 79 - 5 55 46 - 5 45 48 - 5 57 32 - 5 44 2 0.58 112 0 0 - 5 26 57 5 30 11.4 2 250 78 - 5 31 56 - 5 21 59 - 5 33 41 - 5 20 13 0.63 113 0 0 - 5 3 35 5 30 11.6 1 249 77 - 5 8 33 - 4 58 38 - 5 10 19 - 4 56 53 0.80 114 0 0 - 4 40 42 5 30 11.6 0 249 76 - 4 45 39 - 4 35 45 - 4 47 24 - 4 34 0 9.28 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 348-129168 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 03 38.0798 DE: -20 31 41.585 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 03 38.0799 DE: -20 31 41.585 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (25295) 1998 WK17 asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.09560 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.020", 0.001", 68.2° remarks: * orbital elements for (25295)1998 WK17 : Mean anomaly = 60.2014551353 deg Arg. of pericenter = 296.2449586341 deg Long. of node = 244.6278869853 deg Inclination = 21.4566177589 deg Eccentricity = 0.1104073405 Semimajor axis = 3.1728063480 AU Perihelion dist = 2.8225052373 AU Mag: H = 12.89, G = 0.15 Epoch of elements : MJD 60377.22642234 TDT (2024 Mar 08.2264) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.66,2024,3,8,5.434139,0.135875,-0.387477,12.453014,4.360048,-0.005775,0.000021,0.000000,0.000000 23.3410,-20.5285,101.17,-4.69,False UCAC4 348-129168,18.06057769,-20.5282180,12.58,11.82,11.41,0.0,0,,18.08441605,-20.5285298,6.88,6.84,0,0,0 25295,1998 WK17,18.70,15.507,3.0956,0,0,2.519,12.38,,1.2,0 0,60.1620,2024,3,8,296.2450,244.6279,21.4566,0.11041,3.17281,2.82251,12.88,5.0,0.15 1.177,0.0203,0.0009,68,0.0012,Known errors,1.45,0,-1,-1 20240308_129168,60139.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org