IOTA/IOTA-ES occultation update for (42479) Tolik / UCAC4 306-247776 event on 2024 Oct 05, 19:16 UT Visible from Summary ------- On 2024 Oct 05 UT, the 11.769 km diameter asteroid (42479) Tolik 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 6.84 mag to 18.61 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: 88 * date and approx. time of event: 2024 Oct 05, 19:12 - 2024 Oct 05, 19:21 * geocentric midpoint of event [JD]: 2460589.30327808 * magnitude of target star: 11.77 * magnitude drop [mag]: 6.84 * estimated maximum duration [s]: 0.570 * Moon: 8 % sunlit, 53° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.56 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 93°) * approx speed of asteroid's shadow [km/s]: 20.8174 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 306-247776 by 42479 Tolik on 2024 Oct 5 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 -130 0 0 -27 29 45 19 12 7.2 0 123 61 -27 33 59 -27 25 31 -27 38 41 -27 20 50 .... -129 0 0 -28 4 19 19 12 7.3 1 122 61 -28 8 34 -28 0 5 -28 13 16 -27 55 24 0.45 -128 0 0 -28 38 46 19 12 7.6 2 122 62 -28 43 1 -28 34 32 -28 47 43 -28 29 50 0.47 -127 0 0 -29 13 5 19 12 7.9 3 121 62 -29 17 19 -29 8 51 -29 22 2 -29 4 9 0.47 -126 0 0 -29 47 14 19 12 8.3 5 121 62 -29 51 28 -29 43 0 -29 56 11 -29 38 18 0.48 -125 0 0 -30 21 13 19 12 8.9 6 120 62 -30 25 27 -30 16 58 -30 30 9 -30 12 16 0.48 -124 0 0 -30 55 0 19 12 9.5 7 120 62 -30 59 14 -30 50 45 -31 3 56 -30 46 4 0.48 -123 0 0 -31 28 34 19 12 10.3 8 119 61 -31 32 48 -31 24 20 -31 37 31 -31 19 38 0.48 -122 0 0 -32 1 55 19 12 11.2 9 119 61 -32 6 9 -31 57 41 -32 10 51 -31 52 59 0.49 -121 0 0 -32 35 1 19 12 12.1 10 118 61 -32 39 15 -32 30 47 -32 43 57 -32 26 6 0.49 -120 0 0 -33 7 52 19 12 13.2 11 118 61 -33 12 6 -33 3 38 -33 16 48 -32 58 57 0.49 -119 0 0 -33 40 26 19 12 14.3 12 117 61 -33 44 40 -33 36 13 -33 49 22 -33 31 32 0.49 -118 0 0 -34 12 44 19 12 15.6 13 116 60 -34 16 57 -34 8 30 -34 21 38 -34 3 50 0.49 -117 0 0 -34 44 43 19 12 16.9 14 116 60 -34 48 56 -34 40 29 -34 53 37 -34 35 49 0.49 -116 0 0 -35 16 23 19 12 18.3 15 115 60 -35 20 36 -35 12 10 -35 25 16 -35 7 30 0.49 -115 0 0 -35 47 43 19 12 19.8 16 115 59 -35 51 56 -35 43 30 -35 56 36 -35 38 51 0.49 -114 0 0 -36 18 43 19 12 21.4 16 114 59 -36 22 55 -36 14 31 -36 27 35 -36 9 51 0.49 -113 0 0 -36 49 22 19 12 23.1 17 113 58 -36 53 33 -36 45 10 -36 58 13 -36 40 31 0.49 -112 0 0 -37 19 38 19 12 24.8 18 113 58 -37 23 50 -37 15 27 -37 28 29 -37 10 49 0.49 -111 0 0 -37 49 33 19 12 26.6 19 112 57 -37 53 44 -37 45 22 -37 58 22 -37 40 44 0.49 -110 0 0 -38 19 4 19 12 28.5 20 111 57 -38 23 15 -38 14 54 -38 27 53 -38 10 17 0.49 -109 0 0 -38 48 12 19 12 30.5 21 111 56 -38 52 22 -38 44 2 -38 57 0 -38 39 26 0.49 -108 0 0 -39 16 56 19 12 32.5 22 110 56 -39 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33 1 19 21 12.3 12 243 -61 -23 37 14 -23 28 49 -23 41 55 -23 24 9 0.53 64 0 0 -22 57 52 19 21 13.6 11 243 -62 -23 2 4 -22 53 39 -23 6 44 -22 49 0 0.53 65 0 0 -22 22 45 19 21 14.7 10 243 -63 -22 26 57 -22 18 33 -22 31 37 -22 13 54 0.54 66 0 0 -21 47 42 19 21 15.7 8 242 -63 -21 51 54 -21 43 30 -21 56 33 -21 38 52 0.55 67 0 0 -21 12 45 19 21 16.6 7 242 -64 -21 16 56 -21 8 33 -21 21 35 -21 3 55 0.55 68 0 0 -20 37 53 19 21 17.4 6 242 -64 -20 42 4 -20 33 43 -20 46 42 -20 29 5 0.57 69 0 0 -20 3 10 19 21 18.1 5 241 -65 -20 7 20 -19 59 0 -20 11 58 -19 54 23 0.58 70 0 0 -19 28 35 19 21 18.6 4 241 -65 -19 32 45 -19 24 26 -19 37 22 -19 19 49 0.61 71 0 0 -18 54 10 19 21 19.0 3 240 -66 -18 58 19 -18 50 1 -19 2 56 -18 45 26 0.65 72 0 0 -18 19 56 19 21 19.3 2 240 -66 -18 24 5 -18 15 48 -18 28 41 -18 11 13 0.74 73 0 0 -17 45 54 19 21 19.5 1 240 -66 -17 50 2 -17 41 47 -17 54 37 -17 37 12 1.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 306-247776 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 34 48.7347 DE: -28 52 16.691 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 34 48.7347 DE: -28 52 16.691 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42479) Tolik asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.27610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 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): 0.016", 0.003", 93.205° remarks: * orbital elements for (42479)Tolik : Mean anomaly = 332.0125057222 deg Arg. of pericenter = 270.3107671233 deg Long. of node = 67.3724849387 deg Inclination = 6.5452522621 deg Eccentricity = 0.1181627689 Semimajor axis = 2.6738733254 AU Perihelion dist = 2.3579210496 AU Mag: H = 13.78, G = 0.15 Epoch of elements : MJD 60588.80327776 TDT (2024 Oct 05.8033) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.57,2024,10,5,19.278674,0.043325,-0.429953,11.689937,1.185563,0.005588,0.000305,0.000000,0.000000 -25.0397,-28.8532,-112.13,-5.15,False UCAC4 306-247776,18.58020412,-28.8713031,12.44,11.77,11.41,0.0,0,,18.60627250,-28.8532449,6.84,6.75,0,0,0 42479,Tolik,18.61,11.769,2.2761,0,0,3.438,4.59,,0.8,0 0,331.8314,2024,10,5,270.3108,67.3725,6.5453,0.11816,2.67387,2.35792,13.78,5.0,0.15 1.554,0.0157,0.0032,93,0.0040,Known errors,0.78,0,-1,-1 20241005_247776,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org