IOTA/IOTA-ES occultation update for (7859) Lhasa / UCAC4 343-200003 event on 2024 Dec 06, 19:12 UT Visible from Summary ------- On 2024 Dec 06 UT, the 13.4279615646683 km diameter asteroid (7859) Lhasa will occult a 10.0 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 9.19 mag to 19.18 mag (the magnitude of the asteroid) for at most 0.450 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 06, 19:10 - 2024 Dec 06, 19:15 * geocentric midpoint of event [JD]: 2460651.30059359 * magnitude of target star: 9.99 * magnitude drop [mag]: 9.19 * estimated maximum duration [s]: 0.450 * Moon: 30 % sunlit, 17° distance * Sun: 49° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 74°) * approx speed of asteroid's shadow [km/s]: 36.9328 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 343-200003 by 7859 Lhasa on 2024 Dec 6 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 -176 0 0 -52 8 31 19 10 41.8 0 126 32 -52 15 53 -52 1 10 -52 18 9 -51 58 55 - 52 13 8 - 52 3 54 .... -175 0 0 -52 35 23 19 10 41.9 1 125 33 -52 42 44 -52 28 2 -52 45 0 -52 25 48 - 52 40 0 - 52 30 46 0.79 -174 0 0 -53 1 51 19 10 42.0 2 124 33 -53 9 11 -52 54 31 -53 11 27 -52 52 17 - 53 6 27 - 52 57 15 0.83 -173 0 0 -53 27 55 19 10 42.1 3 123 34 -53 35 15 -53 20 36 -53 37 29 -53 18 22 - 53 32 31 - 53 23 19 0.84 -172 0 0 -53 53 34 19 10 42.3 3 123 34 -54 0 53 -53 46 16 -54 3 8 -53 44 3 - 53 58 9 - 53 48 59 0.85 -171 0 0 -54 18 49 19 10 42.5 4 122 35 -54 26 7 -54 11 32 -54 28 21 -54 9 18 - 54 23 23 - 54 14 15 0.86 -170 0 0 -54 43 38 19 10 42.7 5 121 35 -54 50 55 -54 36 22 -54 53 9 -54 34 9 - 54 48 12 - 54 39 5 0.86 -169 0 0 -55 8 2 19 10 42.9 6 120 36 -55 15 18 -55 0 48 -55 17 32 -54 58 35 - 55 12 36 - 55 3 30 0.87 -168 0 0 -55 32 1 19 10 43.2 6 119 36 -55 39 16 -55 24 48 -55 41 29 -55 22 35 - 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38 5 30 - 37 56 25 0.90 13 0 0 -37 27 55 19 14 33.1 28 263 -10 -37 35 9 -37 20 42 -37 37 22 -37 18 29 - 37 32 27 - 37 23 23 0.90 14 0 0 -36 54 55 19 14 34.9 27 262 -11 -37 2 8 -36 47 44 -37 4 21 -36 45 32 - 36 59 27 - 36 50 24 0.90 15 0 0 -36 22 1 19 14 36.7 26 262 -12 -36 29 13 -36 14 50 -36 31 25 -36 12 39 - 36 26 32 - 36 17 31 0.90 16 0 0 -35 49 13 19 14 38.4 25 261 -13 -35 56 23 -35 42 3 -35 58 35 -35 39 52 - 35 53 42 - 35 44 43 0.90 17 0 0 -35 16 31 19 14 40.0 24 260 -14 -35 23 40 -35 9 24 -35 25 52 -35 7 13 - 35 21 0 - 35 12 3 0.91 18 0 0 -34 43 58 19 14 41.6 23 259 -15 -34 51 6 -34 36 52 -34 53 17 -34 34 42 - 34 48 26 - 34 39 31 0.91 19 0 0 -34 11 35 19 14 43.2 22 259 -16 -34 18 41 -34 4 30 -34 20 52 -34 2 20 - 34 16 2 - 34 7 8 0.91 20 0 0 -33 39 23 19 14 44.7 22 258 -17 -33 46 27 -33 32 19 -33 48 37 -33 30 10 - 33 43 49 - 33 34 57 0.91 21 0 0 -33 7 22 19 14 46.1 21 257 -18 -33 14 25 -33 0 20 -33 16 35 -32 58 11 - 33 11 47 - 33 2 57 0.91 22 0 0 -32 35 34 19 14 47.5 20 257 -19 -32 42 36 -32 28 34 -32 44 45 -32 26 25 - 32 39 59 - 32 31 10 0.91 23 0 0 -32 4 1 19 14 48.8 19 256 -20 -32 11 1 -31 57 2 -32 13 9 -31 54 54 - 32 8 24 - 31 59 38 0.91 24 0 0 -31 32 42 19 14 50.1 18 255 -21 -31 39 41 -31 25 45 -31 41 49 -31 23 37 - 31 37 5 - 31 28 20 0.92 25 0 0 -31 1 40 19 14 51.3 17 255 -22 -31 8 37 -30 54 44 -31 10 44 -30 52 37 - 31 6 1 - 30 57 19 0.92 26 0 0 -30 30 55 19 14 52.4 16 254 -23 -30 37 50 -30 24 1 -30 39 57 -30 21 54 - 30 35 15 - 30 26 35 0.92 27 0 0 -30 0 28 19 14 53.5 15 254 -24 -30 7 22 -29 53 36 -30 9 28 -29 51 29 - 30 4 47 - 29 56 9 0.92 28 0 0 -29 30 20 19 14 54.5 14 253 -25 -29 37 12 -29 23 29 -29 39 18 -29 21 24 - 29 34 38 - 29 26 2 0.93 29 0 0 -29 0 32 19 14 55.5 13 252 -26 -29 7 23 -28 53 43 -29 9 28 -28 51 38 - 29 4 50 - 28 56 15 0.93 30 0 0 -28 31 6 19 14 56.3 12 252 -27 -28 37 54 -28 24 18 -28 40 0 -28 22 13 - 28 35 22 - 28 26 50 0.93 31 0 0 -28 2 1 19 14 57.1 11 251 -28 -28 8 48 -27 55 15 -28 10 53 -27 53 11 - 28 6 16 - 27 57 46 0.94 32 0 0 -27 33 18 19 14 57.9 10 251 -28 -27 40 4 -27 26 34 -27 42 8 -27 24 30 - 27 37 33 - 27 29 5 0.95 33 0 0 -27 5 0 19 14 58.5 9 250 -29 -27 11 43 -26 58 17 -27 13 47 -26 56 13 - 27 9 13 - 27 0 47 0.95 34 0 0 -26 37 5 19 14 59.1 8 250 -30 -26 43 47 -26 30 23 -26 45 50 -26 28 21 - 26 41 17 - 26 32 53 0.96 35 0 0 -26 9 35 19 14 59.7 7 249 -31 -26 16 15 -26 2 55 -26 18 18 -26 0 53 - 26 13 46 - 26 5 24 0.97 36 0 0 -25 42 31 19 15 0.1 6 249 -32 -25 49 10 -25 35 53 -25 51 12 -25 33 51 - 25 46 41 - 25 38 21 0.99 37 0 0 -25 15 53 19 15 0.5 5 249 -33 -25 22 30 -25 9 16 -25 24 32 -25 7 15 - 25 20 2 - 25 11 44 1.01 38 0 0 -24 49 42 19 15 0.8 4 248 -34 -24 56 17 -24 43 7 -24 58 19 -24 41 6 - 24 53 50 - 24 45 34 1.04 39 0 0 -24 23 58 19 15 1.1 3 248 -35 -24 30 32 -24 17 25 -24 32 33 -24 15 24 - 24 28 5 - 24 19 51 1.10 40 0 0 -23 58 43 19 15 1.2 2 247 -36 -24 5 15 -23 52 11 -24 7 16 -23 50 11 - 24 2 49 - 23 54 37 1.21 41 0 0 -23 33 56 19 15 1.4 1 247 -36 -23 40 27 -23 27 25 -23 42 27 -23 25 26 - 23 38 1 - 23 29 51 1.56 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 343-200003 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 26 59.8733 DE: -21 32 15.094 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 26 59.8733 DE: -21 32 15.094 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.300) * V mag [mag]: 10.0 * B mag [mag]: 12.2 * Diameter [mas]: 1.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7859) Lhasa asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.22430 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 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): 0.010", 0.001", 74.035° remarks: * orbital elements for (7859)Lhasa : Mean anomaly = 289.8687341362 deg Arg. of pericenter = 37.1463303573 deg Long. of node = 7.9414798450 deg Inclination = 3.7393397397 deg Eccentricity = 0.1333576133 Semimajor axis = 2.7632177640 AU Perihelion dist = 2.3947216378 AU Mag: H = 13.62, G = 0.15 Epoch of elements : MJD 60650.80059341 TDT (2024 Dec 06.8006) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,0.45,2024,12,6,19.214246,0.183547,-0.631693,20.010369,5.842729,0.004351,0.000916,-0.000001,0.000000 -57.1663,-21.4572,-110.37,-22.61,False UCAC4 343-200003,20.44996485,-21.5375260,12.22,9.99,8.79,1.3,4,,20.47392260,-21.4572208,9.19,9.94,0,0,0 7859,Lhasa,19.18,16.468,3.2243,0,0,3.910,15.94,,1.4,0 0,289.6969,2024,12,6,37.1463,7.9415,3.7393,0.13336,2.76322,2.39472,13.62,5.0,0.15 1.153,0.0100,0.0011,74,0.0011,Known errors,1.25,0,-1,-1 20241206_200003,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org