IOTA/IOTA-ES occultation update for (3556) Lixiaohua / UCAC4 356-080103 event on 2024 Oct 14, 09:07 UT Visible from Summary ------- On 2024 Oct 14 UT, the 20.5508882785002 km diameter asteroid (3556) Lixiaohua will occult a 11.1 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 8.23 mag to 19.31 mag (the magnitude of the asteroid) for at most 0.630 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: 97 * date and approx. time of event: 2024 Oct 14, 09:04 - 2024 Oct 14, 09:10 * geocentric midpoint of event [JD]: 2460597.88049870 * magnitude of target star: 11.08 * magnitude drop [mag]: 8.23 * estimated maximum duration [s]: 0.630 * Moon: 86 % sunlit, 87° distance * Sun: 50° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 89°) * approx speed of asteroid's shadow [km/s]: 33.5885 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 356-080103 by 3556 Lixiaohua on 2024 Oct 14 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 - 4 0 0 -13 45 32 9 4 57.0 0 110 46 -13 52 1 -13 39 2 -13 57 2 -13 34 2 .... - 3 0 0 -14 6 30 9 4 57.0 1 109 47 -14 13 0 -14 0 0 -14 18 1 -13 55 0 0.32 - 2 0 0 -14 27 36 9 4 57.2 2 109 48 -14 34 6 -14 21 6 -14 39 7 -14 16 5 0.35 - 1 0 0 -14 48 49 9 4 57.3 3 109 49 -14 55 20 -14 42 19 -15 0 22 -14 37 18 0.35 0 0 0 -15 10 10 9 4 57.6 4 109 50 -15 16 41 -15 3 39 -15 21 42 -14 58 38 0.36 1 0 0 -15 31 36 9 4 57.9 5 108 51 -15 38 8 -15 25 5 -15 43 10 -15 20 4 0.36 2 0 0 -15 53 9 9 4 58.3 6 108 52 -15 59 40 -15 46 38 -16 4 43 -15 41 36 0.36 3 0 0 -16 14 47 9 4 58.7 7 108 53 -16 21 18 -16 8 15 -16 26 21 -16 3 13 0.36 4 0 0 -16 36 29 9 4 59.2 8 107 54 -16 43 1 -16 29 57 -16 48 4 -16 24 55 0.37 5 0 0 -16 58 16 9 4 59.8 9 107 55 -17 4 48 -16 51 44 -17 9 51 -16 46 42 0.37 6 0 0 -17 20 7 9 5 0.4 11 107 56 -17 26 39 -17 13 34 -17 31 42 -17 8 32 0.37 7 0 0 -17 42 0 9 5 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-30 10 58 9 10 45.3 16 257 -30 -30 17 26 -30 4 30 -30 22 25 -29 59 32 0.39 172 0 0 -29 52 45 9 10 46.2 15 257 -31 -29 59 13 -29 46 17 -30 4 13 -29 41 18 0.39 173 0 0 -29 34 19 9 10 47.0 14 256 -32 -29 40 48 -29 27 51 -29 45 48 -29 22 52 0.39 174 0 0 -29 15 41 9 10 47.8 13 255 -33 -29 22 10 -29 9 12 -29 27 10 -29 4 13 0.39 175 0 0 -28 56 51 9 10 48.6 12 255 -34 -29 3 20 -28 50 21 -29 8 21 -28 45 22 0.40 176 0 0 -28 37 48 9 10 49.2 12 254 -35 -28 44 18 -28 31 18 -28 49 19 -28 26 18 0.40 177 0 0 -28 18 34 9 10 49.9 11 254 -36 -28 25 4 -28 12 4 -28 30 5 -28 7 3 0.40 178 0 0 -27 59 8 9 10 50.5 10 254 -36 -28 5 38 -27 52 38 -28 10 40 -27 47 37 0.40 179 0 0 -27 39 31 9 10 51.0 9 253 -37 -27 46 2 -27 33 1 -27 51 4 -27 28 0 0.41 180 0 0 -27 19 44 9 10 51.5 8 253 -38 -27 26 15 -27 13 13 -27 31 17 -27 8 12 0.41 -179 0 0 -26 59 47 9 10 51.9 7 252 -39 -27 6 18 -26 53 16 -27 11 20 -26 48 14 0.42 -178 0 0 -26 39 39 9 10 52.3 6 252 -40 -26 46 11 -26 33 8 -26 51 13 -26 28 6 0.43 -177 0 0 -26 19 22 9 10 52.6 5 251 -41 -26 25 54 -26 12 51 -26 30 56 -26 7 49 0.44 -176 0 0 -25 58 57 9 10 52.9 4 251 -42 -26 5 29 -25 52 25 -26 10 31 -25 47 23 0.45 -175 0 0 -25 38 22 9 10 53.1 3 250 -43 -25 44 54 -25 31 50 -25 49 57 -25 26 48 0.48 -174 0 0 -25 17 39 9 10 53.2 2 250 -44 -25 24 12 -25 11 7 -25 29 14 -25 6 5 0.53 -173 0 0 -24 56 48 9 10 53.3 1 249 -45 -25 3 21 -24 50 16 -25 8 24 -24 45 14 0.68 -172 0 0 -24 35 50 9 10 53.4 0 249 -45 -24 42 23 -24 29 18 -24 47 26 .. .. .. 6.18 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 356-080103 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 39 19.3452 DE: -18 57 11.468 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 39 19.3451 DE: -18 57 11.468 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.1 * B mag [mag]: 12.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3556) Lixiaohua asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.97170 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 24 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", 89.013° remarks: * orbital elements for (3556)Lixiaohua : Mean anomaly = 260.0721854468 deg Arg. of pericenter = 145.7817463142 deg Long. of node = 240.6872168885 deg Inclination = 9.2799667528 deg Eccentricity = 0.2131083925 Semimajor axis = 3.1691831504 AU Perihelion dist = 2.4938036236 AU Mag: H = 12.89, G = 0.15 Epoch of elements : MJD 60597.38049859 TDT (2024 Oct 14.3805) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.63,2024,10,14,9.131969,-0.035323,-0.342794,18.862193,-1.906583,0.004459,-0.000394,-0.000001,0.000000 89.8004,-19.0020,39.50,-8.39,False UCAC4 356-080103,16.65537370,-18.9531855,12.54,11.08,10.29,0.2,0,,16.67918663,-19.0020130,8.23,8.57,0,0,0 3556,Lixiaohua,19.31,21.127,3.9717,0,0,2.945,-4.22,,2.0,0 0,260.0057,2024,10,14,145.7817,240.6872,9.2800,0.21311,3.16918,2.49380,12.89,5.0,0.15 1.386,0.0163,0.0021,89,0.0028,Known errors,1.45,0,-1,-1 20241014_080103,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org