IOTA/IOTA-ES occultation update for (18595) 1998 BR1 / TYC 6174-00832-1 event on 2024 Dec 31, 01:52 UT Visible from Summary ------- On 2024 Dec 31 UT, the 11.992 km diameter asteroid (18595) 1998 BR1 will occult a 11.2 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.35 mag to 19.56 mag (the magnitude of the asteroid) for at most 0.330 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 Dec 31, 01:49 - 2024 Dec 31, 01:55 * geocentric midpoint of event [JD]: 2460675.57817317 * magnitude of target star: 11.21 * magnitude drop [mag]: 8.35 * estimated maximum duration [s]: 0.330 * Moon: 0 % sunlit, 51° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 112°) * approx speed of asteroid's shadow [km/s]: 36.4237 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6174-00832-1 by 18595 1998 BR1 on 2024 Dec 31 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 23 0 0 29 50 5 1 49 44.5 1 111 -45 29 46 31 29 53 40 29 44 9 29 56 1 .... 24 0 0 29 30 23 1 49 44.5 2 111 -44 29 26 48 29 33 58 29 24 27 29 36 20 -0.10 25 0 0 29 10 21 1 49 44.6 3 112 -44 29 6 46 29 13 56 29 4 24 29 16 18 -0.15 26 0 0 28 49 59 1 49 44.8 3 112 -43 28 46 23 28 53 34 28 44 1 28 55 57 -0.18 27 0 0 28 29 17 1 49 45.0 4 113 -42 28 25 41 28 32 53 28 23 18 28 35 15 -0.19 28 0 0 28 8 15 1 49 45.2 5 113 -41 28 4 39 28 11 52 28 2 16 28 14 14 -0.20 29 0 0 27 46 55 1 49 45.5 6 113 -40 27 43 18 27 50 31 27 40 55 27 52 54 -0.21 30 0 0 27 25 15 1 49 45.9 7 114 -39 27 21 38 27 28 52 27 19 15 27 31 15 -0.21 31 0 0 27 3 17 1 49 46.3 8 114 -38 26 59 39 27 6 54 26 57 16 27 9 18 -0.22 32 0 0 26 41 0 1 49 46.7 9 115 -37 26 37 22 26 44 38 26 34 59 26 47 1 -0.22 33 0 0 26 18 25 1 49 47.3 10 115 -36 26 14 47 26 22 3 26 12 23 26 24 27 -0.22 34 0 0 25 55 33 1 49 47.8 11 116 -35 25 51 54 25 59 11 25 49 30 26 1 35 -0.23 35 0 0 25 32 23 1 49 48.4 12 116 -34 25 28 44 25 36 1 25 26 20 25 38 26 -0.23 36 0 0 25 8 56 1 49 49.1 13 117 -33 25 5 17 25 12 35 25 2 52 25 14 59 -0.23 37 0 0 24 45 12 1 49 49.8 14 117 -32 24 41 33 24 48 51 24 39 8 24 51 16 -0.23 38 0 0 24 21 12 1 49 50.6 15 118 -31 24 17 33 24 24 51 24 15 8 24 27 17 -0.23 39 0 0 23 56 56 1 49 51.5 16 118 -30 23 53 16 24 0 36 23 50 51 24 3 1 -0.23 40 0 0 23 32 25 1 49 52.4 17 118 -29 23 28 45 23 36 5 23 26 20 23 38 30 -0.23 41 0 0 23 7 39 1 49 53.3 18 119 -28 23 3 59 23 11 19 23 1 33 23 13 45 -0.23 42 0 0 22 42 38 1 49 54.4 19 119 -27 22 38 58 22 46 19 22 36 32 22 48 44 -0.24 43 0 0 22 17 24 1 49 55.4 20 120 -26 22 13 43 22 21 4 22 11 17 22 23 30 -0.24 44 0 0 21 51 55 1 49 56.6 21 120 -25 21 48 15 21 55 36 21 45 49 21 58 3 -0.24 45 0 0 21 26 14 1 49 57.8 22 120 -24 21 22 33 21 29 56 21 20 7 21 32 22 -0.24 46 0 0 21 0 21 1 49 59.0 23 121 -23 20 56 40 21 4 2 20 54 13 21 6 29 -0.24 47 0 0 20 34 16 1 50 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25 4 1 55 15.0 18 254 64 - 7 28 29 - 7 21 39 - 7 30 45 - 7 19 23 -0.25 175 0 0 - 7 12 46 1 55 16.0 17 254 63 - 7 16 12 - 7 9 21 - 7 18 28 - 7 7 5 -0.25 176 0 0 - 7 0 3 1 55 16.9 16 254 62 - 7 3 29 - 6 56 37 - 7 5 45 - 6 54 21 -0.25 177 0 0 - 6 46 55 1 55 17.7 15 254 61 - 6 50 21 - 6 43 29 - 6 52 37 - 6 41 12 -0.25 178 0 0 - 6 33 21 1 55 18.5 14 254 60 - 6 36 48 - 6 29 55 - 6 39 4 - 6 27 38 -0.25 179 0 0 - 6 19 23 1 55 19.3 13 253 59 - 6 22 50 - 6 15 56 - 6 25 6 - 6 13 39 -0.25 180 0 0 - 6 5 0 1 55 20.0 12 253 58 - 6 8 27 - 6 1 33 - 6 10 43 - 5 59 16 -0.25 -179 0 0 - 5 50 12 1 55 20.6 11 253 57 - 5 53 39 - 5 46 44 - 5 55 56 - 5 44 27 -0.25 -178 0 0 - 5 34 59 1 55 21.2 10 253 56 - 5 38 27 - 5 31 32 - 5 40 44 - 5 29 14 -0.25 -177 0 0 - 5 19 23 1 55 21.7 9 253 55 - 5 22 51 - 5 15 55 - 5 25 8 - 5 13 37 -0.25 -176 0 0 - 5 3 22 1 55 22.1 8 253 54 - 5 6 51 - 4 59 54 - 5 9 8 - 4 57 36 -0.26 -175 0 0 - 4 46 58 1 55 22.6 7 253 53 - 4 50 26 - 4 43 29 - 4 52 44 - 4 41 11 -0.26 -174 0 0 - 4 30 10 1 55 22.9 6 253 52 - 4 33 39 - 4 26 40 - 4 35 57 - 4 24 22 -0.26 -173 0 0 - 4 12 58 1 55 23.2 5 253 51 - 4 16 27 - 4 9 29 - 4 18 46 - 4 7 10 -0.26 -172 0 0 - 3 55 23 1 55 23.4 4 253 50 - 3 58 53 - 3 51 53 - 4 1 11 - 3 49 35 -0.26 -171 0 0 - 3 37 26 1 55 23.6 2 253 49 - 3 40 56 - 3 33 55 - 3 43 14 - 3 31 36 -0.26 -170 0 0 - 3 19 5 1 55 23.7 1 253 48 - 3 22 36 - 3 15 35 - 3 24 55 - 3 13 16 -0.27 -169 0 0 - 3 0 22 1 55 23.8 0 253 47 - 3 3 53 - 2 56 52 - 3 6 12 - 2 54 32 -0.31 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: TYC 6174-00832-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 15 46.4288 DE: -17 23 35.627 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 15 46.4288 DE: -17 23 35.627 * 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: (18595) 1998 BR1 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.30990 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.008", 0.001", 112.454° remarks: * orbital elements for (18595)1998 BR1 : Mean anomaly = 241.3558667773 deg Arg. of pericenter = 312.2689248012 deg Long. of node = 43.8057325810 deg Inclination = 5.8322921420 deg Eccentricity = 0.2554598081 Semimajor axis = 2.3681923318 AU Perihelion dist = 1.7632143732 AU Mag: H = 13.91, G = 0.15 Epoch of elements : MJD 60675.07817313 TDT (2024 Dec 31.0782) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr25,0.33,2024,12,31,1.876156,0.073663,0.234673,19.633589,-6.097238,-0.004303,0.001209,-0.000001,0.000000 101.1591,-17.4851,152.61,-23.07,False TYC 6174-00832-1,15.26289684,-17.3932295,11.67,11.21,10.96,0.0,0,,15.28616137,-17.4851449,8.35,8.15,0,0,0 18595,1998 BR1,19.56,11.992,3.3099,0,0,3.647,-16.20,,1.0,0 0,241.0643,2024,12,30,312.2689,43.8057,5.8323,0.25546,2.36819,1.76321,13.91,5.0,0.15 1.330,0.0083,0.0015,112,0.0017,Known errors,1.05,0,-1,-1 20241231_0832-1,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org