IOTA/IOTA-ES occultation update for (11394) 1998 XL77 / TYC 6245-00307-1 event on 2024 Oct 17, 00:49 UT Visible from Summary ------- On 2024 Oct 17 UT, the 17.523 km diameter asteroid (11394) 1998 XL77 will occult a 10.6 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.20 mag to 18.83 mag (the magnitude of the asteroid) for at most 0.550 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: 95 * date and approx. time of event: 2024 Oct 17, 00:45 - 2024 Oct 17, 00:52 * geocentric midpoint of event [JD]: 2460600.53423950 * magnitude of target star: 10.63 * magnitude drop [mag]: 8.20 * estimated maximum duration [s]: 0.550 * Moon: 100 % sunlit, 117° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 107°) * approx speed of asteroid's shadow [km/s]: 32.0325 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6245-00307-1 by 11394 1998 XL77 on 2024 Oct 17 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 135 0 0 6 26 26 0 45 59.7 0 112 56 6 21 17 6 31 34 6 16 51 6 36 0 .... 136 0 0 6 2 11 0 45 59.8 1 112 57 5 57 2 6 7 20 5 52 35 6 11 46 0.15 137 0 0 5 37 41 0 45 59.9 2 112 58 5 32 32 5 42 50 5 28 5 5 47 17 0.12 138 0 0 5 12 57 0 46 0.1 3 112 60 5 7 47 5 18 6 5 3 20 5 22 34 0.10 139 0 0 4 47 59 0 46 0.3 5 112 61 4 42 49 4 53 9 4 38 21 4 57 37 0.10 140 0 0 4 22 47 0 46 0.7 6 112 62 4 17 37 4 27 58 4 13 9 4 32 26 0.10 141 0 0 3 57 23 0 46 1.1 7 112 63 3 52 12 4 2 34 3 47 44 4 7 2 0.09 142 0 0 3 31 46 0 46 1.5 8 112 64 3 26 35 3 36 57 3 22 6 3 41 26 0.09 143 0 0 3 5 58 0 46 2.1 9 113 65 3 0 47 3 11 9 2 56 17 3 15 39 0.09 144 0 0 2 39 59 0 46 2.7 10 113 66 2 34 47 2 45 10 2 30 17 2 49 40 0.09 145 0 0 2 13 49 0 46 3.4 11 113 67 2 8 37 2 19 1 2 4 7 2 23 30 0.09 146 0 0 1 47 29 0 46 4.2 12 113 68 1 42 17 1 52 41 1 37 47 1 57 11 0.09 147 0 0 1 21 0 0 46 5.0 13 113 69 1 15 47 1 26 13 1 11 17 1 30 43 0.09 148 0 0 0 54 22 0 46 5.9 14 113 70 0 49 10 0 59 35 0 44 39 1 4 6 0.09 149 0 0 0 27 37 0 46 6.9 15 113 71 0 22 24 0 32 50 0 17 53 0 37 21 0.08 150 0 0 0 0 44 0 46 8.0 17 113 73 - 0 4 29 0 5 57 - 0 9 0 0 10 28 0.08 151 0 0 - 0 26 15 0 46 9.1 18 113 74 - 0 31 29 - 0 21 2 - 0 36 0 - 0 16 31 0.08 152 0 0 - 0 53 21 0 46 10.3 19 113 75 - 0 58 34 - 0 48 7 - 1 3 6 - 0 43 36 0.08 153 0 0 - 1 20 31 0 46 11.5 20 113 76 - 1 25 45 - 1 15 17 - 1 30 17 - 1 10 46 0.08 154 0 0 - 1 47 46 0 46 12.9 21 113 77 - 1 53 0 - 1 42 32 - 1 57 32 - 1 38 1 0.08 155 0 0 - 2 15 5 0 46 14.3 22 113 78 - 2 20 19 - 2 9 51 - 2 24 51 - 2 5 20 0.08 156 0 0 - 2 42 27 0 46 15.8 23 112 79 - 2 47 42 - 2 37 13 - 2 52 13 - 2 32 41 0.08 157 0 0 - 3 9 52 0 46 17.3 24 112 80 - 3 15 6 - 3 4 37 - 3 19 38 - 3 0 6 0.08 158 0 0 - 3 37 18 0 46 18.9 25 112 81 - 3 42 32 - 3 32 3 - 3 47 4 - 3 27 32 0.08 159 0 0 - 4 4 45 0 46 20.6 26 112 82 - 4 9 59 - 3 59 30 - 4 14 31 - 3 54 59 0.08 160 0 0 - 4 32 12 0 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0 52 33.4 11 250 -44 -18 18 24 -18 8 14 -18 22 47 -18 3 50 0.09 - 53 0 0 -17 51 51 0 52 34.0 10 250 -45 -17 56 57 -17 46 46 -18 1 21 -17 42 22 0.09 - 52 0 0 -17 30 6 0 52 34.6 9 250 -46 -17 35 12 -17 25 0 -17 39 37 -17 20 36 0.10 - 51 0 0 -17 8 3 0 52 35.1 8 250 -47 -17 13 9 -17 2 57 -17 17 34 -16 58 32 0.10 - 50 0 0 -16 45 42 0 52 35.5 7 249 -48 -16 50 49 -16 40 35 -16 55 14 -16 36 10 0.10 - 49 0 0 -16 23 4 0 52 35.9 6 249 -49 -16 28 12 -16 17 57 -16 32 37 -16 13 32 0.11 - 48 0 0 -16 0 10 0 52 36.2 5 249 -50 -16 5 17 -15 55 2 -16 9 43 -15 50 36 0.12 - 47 0 0 -15 36 59 0 52 36.5 3 248 -51 -15 42 7 -15 31 51 -15 46 33 -15 27 24 0.13 - 46 0 0 -15 13 32 0 52 36.6 2 248 -52 -15 18 40 -15 8 23 -15 23 7 -15 3 57 0.15 - 45 0 0 -14 49 50 0 52 36.8 1 248 -53 -14 54 59 -14 44 41 -14 59 26 -14 40 14 0.20 - 44 0 0 -14 25 52 0 52 36.8 0 248 -54 -14 31 2 -14 20 43 -14 35 29 -14 16 16 0.60 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6245-00307-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 17 23.1880 DE: -21 40 45.715 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 17 23.1878 DE: -21 40 45.715 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * B mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11394) 1998 XL77 asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.64670 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 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", 0.002", 106.951° remarks: * orbital elements for (11394)1998 XL77 : Mean anomaly = 269.8724348581 deg Arg. of pericenter = 278.8956387383 deg Long. of node = 102.4221203687 deg Inclination = 12.2877376901 deg Eccentricity = 0.1437323117 Semimajor axis = 3.1381274755 AU Perihelion dist = 2.6870771590 AU Mag: H = 12.66, G = 0.15 Epoch of elements : MJD 60600.03423950 TDT (2024 Oct 17.0342) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,0.55,2024,10,17,0.821748,-0.014040,-0.071348,17.738759,-3.496305,0.004853,-0.000268,-0.000001,0.000000 -138.6358,-21.7066,164.01,-9.37,False TYC 6245-00307-1,17.28977447,-21.6793652,11.05,10.63,10.40,0.0,0,,17.31424881,-21.7066483,8.20,7.98,0,0,0 11394,1998 XL77,18.83,17.523,3.6467,0,0,3.070,-8.43,,1.6,0 0,269.6891,2024,10,16,278.8956,102.4221,12.2877,0.14373,3.13813,2.68708,12.66,5.0,0.15 1.432,0.0160,0.0024,107,0.0029,Known errors,0.80,0,-1,-1 20241017_0307-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org