IOTA/IOTA-ES occultation update for (20402) 1998 OH6 / TYC 5558-00021-1 event on 2024 Dec 15, 09:35 UT Visible from Summary ------- On 2024 Dec 15 UT, the 13.914 km diameter asteroid (20402) 1998 OH6 will occult a 11.2 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.68 mag to 18.84 mag (the magnitude of the asteroid) for at most 0.380 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 Dec 15, 09:32 - 2024 Dec 15, 09:38 * geocentric midpoint of event [JD]: 2460659.89990250 * magnitude of target star: 11.16 * magnitude drop [mag]: 7.68 * estimated maximum duration [s]: 0.380 * Moon: 100 % sunlit, 130° distance * Sun: 50° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.002", 104°) * approx speed of asteroid's shadow [km/s]: 37.0886 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5558-00021-1 by 20402 1998 OH6 on 2024 Dec 15 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 - 99 0 0 25 23 57 9 33 2.4 1 102 -49 25 20 3 25 27 52 25 16 34 25 31 20 .... - 98 0 0 25 12 44 9 33 2.5 2 102 -48 25 8 50 25 16 39 25 5 21 25 20 8 -0.08 - 97 0 0 25 1 15 9 33 2.6 3 102 -47 24 57 20 25 5 10 24 53 51 25 8 39 -0.12 - 96 0 0 24 49 30 9 33 2.7 3 103 -46 24 45 34 24 53 25 24 42 5 24 56 54 -0.13 - 95 0 0 24 37 28 9 33 2.9 4 103 -45 24 33 33 24 41 24 24 30 3 24 44 53 -0.14 - 94 0 0 24 25 10 9 33 3.2 5 104 -44 24 21 15 24 29 6 24 17 45 24 32 36 -0.15 - 93 0 0 24 12 37 9 33 3.5 6 104 -43 24 8 41 24 16 33 24 5 11 24 20 3 -0.15 - 92 0 0 23 59 48 9 33 3.8 7 105 -42 23 55 52 24 3 44 23 52 22 24 7 14 -0.16 - 91 0 0 23 46 43 9 33 4.2 8 105 -41 23 42 46 23 50 39 23 39 16 23 54 9 -0.16 - 90 0 0 23 33 22 9 33 4.6 9 105 -40 23 29 26 23 37 19 23 25 56 23 40 49 -0.16 - 89 0 0 23 19 47 9 33 5.1 10 106 -39 23 15 50 23 23 43 23 12 19 23 27 14 -0.16 - 88 0 0 23 5 56 9 33 5.6 11 106 -38 23 1 59 23 9 53 22 58 28 23 13 23 -0.17 - 87 0 0 22 51 50 9 33 6.2 12 107 -37 22 47 52 22 55 47 22 44 22 22 59 18 -0.17 - 86 0 0 22 37 29 9 33 6.8 13 107 -37 22 33 31 22 41 26 22 30 0 22 44 58 -0.17 - 85 0 0 22 22 53 9 33 7.5 14 107 -36 22 18 56 22 26 51 22 15 24 22 30 22 -0.17 - 84 0 0 22 8 3 9 33 8.2 15 108 -35 22 4 5 22 12 1 22 0 34 22 15 33 -0.17 - 83 0 0 21 52 59 9 33 9.0 16 108 -34 21 49 1 21 56 57 21 45 29 22 0 29 -0.17 - 82 0 0 21 37 41 9 33 9.8 17 108 -33 21 33 42 21 41 39 21 30 10 21 45 11 -0.17 - 81 0 0 21 22 8 9 33 10.7 18 109 -32 21 18 10 21 26 7 21 14 38 21 29 39 -0.17 - 80 0 0 21 6 22 9 33 11.6 19 109 -31 21 2 23 21 10 21 20 58 51 21 13 54 -0.17 - 79 0 0 20 50 23 9 33 12.6 20 110 -30 20 46 24 20 54 22 20 42 51 20 57 55 -0.17 - 78 0 0 20 34 10 9 33 13.6 21 110 -29 20 30 11 20 38 10 20 26 38 20 41 42 -0.17 - 77 0 0 20 17 45 9 33 14.7 22 110 -28 20 13 45 20 21 44 20 10 12 20 25 17 -0.17 - 76 0 0 20 1 6 9 33 15.8 23 111 -27 19 57 7 20 5 6 19 53 34 20 8 39 -0.17 - 75 0 0 19 44 16 9 33 17.0 24 111 -26 19 40 16 19 48 16 19 36 43 19 51 49 -0.17 - 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7 31 33 9 38 30.1 20 262 65 - 7 35 24 - 7 27 43 - 7 38 49 - 7 24 17 -0.19 56 0 0 - 7 26 48 9 38 31.2 19 262 64 - 7 30 39 - 7 22 57 - 7 34 4 - 7 19 32 -0.19 57 0 0 - 7 21 44 9 38 32.1 18 262 63 - 7 25 35 - 7 17 52 - 7 29 0 - 7 14 27 -0.19 58 0 0 - 7 16 19 9 38 33.0 17 262 62 - 7 20 10 - 7 12 28 - 7 23 35 - 7 9 2 -0.19 59 0 0 - 7 10 35 9 38 33.9 16 261 61 - 7 14 26 - 7 6 43 - 7 17 51 - 7 3 18 -0.19 60 0 0 - 7 4 31 9 38 34.7 15 261 60 - 7 8 22 - 7 0 39 - 7 11 48 - 6 57 14 -0.19 61 0 0 - 6 58 7 9 38 35.5 14 261 59 - 7 1 59 - 6 54 16 - 7 5 25 - 6 50 50 -0.19 62 0 0 - 6 51 25 9 38 36.2 13 261 59 - 6 55 16 - 6 47 33 - 6 58 42 - 6 44 7 -0.19 63 0 0 - 6 44 23 9 38 36.8 12 261 58 - 6 48 14 - 6 40 31 - 6 51 40 - 6 37 5 -0.19 64 0 0 - 6 37 1 9 38 37.4 11 261 57 - 6 40 53 - 6 33 9 - 6 44 19 - 6 29 43 -0.19 65 0 0 - 6 29 21 9 38 38.0 10 261 56 - 6 33 13 - 6 25 28 - 6 36 39 - 6 22 2 -0.19 66 0 0 - 6 21 21 9 38 38.5 9 261 55 - 6 25 13 - 6 17 29 - 6 28 39 - 6 14 2 -0.19 67 0 0 - 6 13 2 9 38 38.9 8 261 54 - 6 16 55 - 6 9 10 - 6 20 21 - 6 5 43 -0.19 68 0 0 - 6 4 25 9 38 39.3 7 260 53 - 6 8 18 - 6 0 32 - 6 11 44 - 5 57 6 -0.19 69 0 0 - 5 55 29 9 38 39.7 6 260 52 - 5 59 22 - 5 51 36 - 6 2 49 - 5 48 9 -0.19 70 0 0 - 5 46 14 9 38 40.0 5 260 51 - 5 50 7 - 5 42 21 - 5 53 34 - 5 38 54 -0.19 71 0 0 - 5 36 41 9 38 40.2 4 260 50 - 5 40 35 - 5 32 48 - 5 44 2 - 5 29 21 -0.19 72 0 0 - 5 26 50 9 38 40.4 3 260 49 - 5 30 43 - 5 22 57 - 5 34 11 - 5 19 29 -0.19 73 0 0 - 5 16 41 9 38 40.5 2 260 48 - 5 20 34 - 5 12 47 - 5 24 1 - 5 9 20 -0.20 74 0 0 - 5 6 13 9 38 40.6 1 260 48 - 5 10 7 - 5 2 19 - 5 13 34 - 4 58 52 -0.21 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 5558-00021-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 11 14.5361 DE: -10 04 00.086 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 11 14.5362 DE: -10 04 00.086 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20402) 1998 OH6 asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.40500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#42 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): 0.019", 0.002", 103.549° remarks: * orbital elements for (20402)1998 OH6 : Mean anomaly = 21.0634273125 deg Arg. of pericenter = 8.3857818550 deg Long. of node = 164.9707982797 deg Inclination = 6.3111975968 deg Eccentricity = 0.0993205329 Semimajor axis = 3.1544004723 AU Perihelion dist = 2.8411037364 AU Mag: H = 13.05, G = 0.15 Epoch of elements : MJD 60659.39990284 TDT (2024 Dec 15.3999) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#422023Apr25,0.38,2024,12,15,9.597660,0.048655,0.173977,20.181111,-5.563182,-0.004188,0.001691,-0.000001,0.000000 -15.3628,-10.1834,34.86,-23.30,False TYC 5558-00021-1,14.18737111,-10.0666902,11.72,11.16,10.86,0.0,0,,14.20930273,-10.1833881,7.68,7.53,0,0,0 20402,1998 OH6,18.84,13.914,3.4050,0,0,3.532,-14.37,,2.2,0 0,20.9931,2024,12,15,8.3858,164.9708,6.3112,0.09932,3.15440,2.84110,13.05,5.0,0.15 1.444,0.0187,0.0025,104,0.0025,Known errors,0.89,0,-1,-1 20241215_0021-1,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org