IOTA/IOTA-ES occultation update for (1888) Zu / UCAC4 400-131305 event on 2024 Sep 06, 20:20 UT Visible from Summary ------- On 2024 Sep 06 UT, the 11.845 km diameter asteroid (1888) Zu will occult a 11.4 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 5.06 mag to 16.44 mag (the magnitude of the asteroid) for at most 1.360 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 Sep 06, 20:08 - 2024 Sep 06, 20:33 * geocentric midpoint of event [JD]: 2460560.34779787 * magnitude of target star: 11.39 * magnitude drop [mag]: 5.06 * estimated maximum duration [s]: 1.360 * Moon: 12 % sunlit, 105° distance * Sun: 144° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 73°) * approx speed of asteroid's shadow [km/s]: 8.6993 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 400-131305 by 1888 Zu on 2024 Sep 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 - 81 0 0 -32 38 48 20 32 55.9 0 102 31 -32 35 30 -32 42 6 -32 33 24 -32 44 12 .... - 80 0 0 -32 49 12 20 32 55.8 1 101 30 -32 45 55 -32 52 30 -32 43 49 -32 54 36 0.14 - 79 0 0 -32 59 12 20 32 55.5 2 101 29 -32 55 54 -33 2 29 -32 53 49 -33 4 35 0.13 - 78 0 0 -33 8 46 20 32 55.1 3 100 28 -33 5 29 -33 12 4 -33 3 24 -33 14 9 0.13 - 77 0 0 -33 17 56 20 32 54.5 3 100 27 -33 14 39 -33 21 13 -33 12 34 -33 23 19 0.13 - 76 0 0 -33 26 42 20 32 53.8 4 99 26 -33 23 25 -33 29 58 -33 21 20 -33 32 3 0.13 - 75 0 0 -33 35 2 20 32 52.9 5 99 26 -33 31 46 -33 38 19 -33 29 41 -33 40 24 0.13 - 74 0 0 -33 42 59 20 32 51.8 6 98 25 -33 39 42 -33 46 15 -33 37 38 -33 48 20 0.13 - 73 0 0 -33 50 31 20 32 50.6 7 97 24 -33 47 15 -33 53 47 -33 45 10 -33 55 51 0.13 - 72 0 0 -33 57 38 20 32 49.2 8 97 23 -33 54 23 -34 0 54 -33 52 18 -34 2 59 0.13 - 71 0 0 -34 4 22 20 32 47.7 9 96 22 -34 1 6 -34 7 37 -33 59 2 -34 9 42 0.13 - 70 0 0 -34 10 41 20 32 46.0 9 96 22 -34 7 26 -34 13 57 -34 5 22 -34 16 1 0.13 - 69 0 0 -34 16 37 20 32 44.2 10 95 21 -34 13 22 -34 19 52 -34 11 17 -34 21 56 0.13 - 68 0 0 -34 22 8 20 32 42.2 11 95 20 -34 18 53 -34 25 23 -34 16 49 -34 27 27 0.13 - 67 0 0 -34 27 16 20 32 40.1 12 94 19 -34 24 1 -34 30 31 -34 21 57 -34 32 35 0.13 - 66 0 0 -34 32 0 20 32 37.9 13 94 19 -34 28 45 -34 35 15 -34 26 41 -34 37 19 0.13 - 65 0 0 -34 36 20 20 32 35.5 13 93 18 -34 33 6 -34 39 35 -34 31 2 -34 41 39 0.13 - 64 0 0 -34 40 17 20 32 32.9 14 92 17 -34 37 3 -34 43 32 -34 34 59 -34 45 35 0.13 - 63 0 0 -34 43 50 20 32 30.2 15 92 16 -34 40 36 -34 47 5 -34 38 32 -34 49 9 0.13 - 62 0 0 -34 47 0 20 32 27.4 16 91 15 -34 43 46 -34 50 15 -34 41 42 -34 52 18 0.13 - 61 0 0 -34 49 47 20 32 24.5 17 91 15 -34 46 32 -34 53 1 -34 44 29 -34 55 5 0.13 - 60 0 0 -34 52 10 20 32 21.4 18 90 14 -34 48 56 -34 55 24 -34 46 52 -34 57 28 0.13 - 59 0 0 -34 54 10 20 32 18.1 18 90 13 -34 50 56 -34 57 24 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-74 - 8 53 27 - 9 0 40 - 8 51 10 - 9 2 58 0.13 40 0 0 - 8 27 51 20 16 53.7 70 264 -75 - 8 24 15 - 8 31 27 - 8 21 57 - 8 33 45 0.13 41 0 0 - 7 58 36 20 16 41.0 69 263 -76 - 7 55 0 - 8 2 12 - 7 52 42 - 8 4 30 0.13 42 0 0 - 7 29 19 20 16 28.3 68 262 -77 - 7 25 43 - 7 32 56 - 7 23 25 - 7 35 13 0.13 43 0 0 - 7 0 2 20 16 15.7 67 261 -78 - 6 56 25 - 7 3 38 - 6 54 8 - 7 5 56 0.13 44 0 0 - 6 30 44 20 16 3.2 66 260 -79 - 6 27 7 - 6 34 20 - 6 24 50 - 6 36 38 0.13 45 0 0 - 6 1 26 20 15 50.8 65 259 -79 - 5 57 50 - 6 5 2 - 5 55 32 - 6 7 20 0.13 46 0 0 - 5 32 9 20 15 38.5 64 259 -80 - 5 28 33 - 5 35 46 - 5 26 16 - 5 38 3 0.13 47 0 0 - 5 2 55 20 15 26.3 63 258 -81 - 4 59 19 - 5 6 31 - 4 57 1 - 5 8 48 0.13 48 0 0 - 4 33 42 20 15 14.2 61 257 -82 - 4 30 6 - 4 37 18 - 4 27 49 - 4 39 36 0.13 49 0 0 - 4 4 33 20 15 2.2 60 257 -83 - 4 0 57 - 4 8 9 - 3 58 40 - 4 10 26 0.13 50 0 0 - 3 35 28 20 14 50.3 59 256 -84 - 3 31 52 - 3 39 4 - 3 29 35 - 3 41 21 0.13 51 0 0 - 3 6 27 20 14 38.5 58 256 -84 - 3 2 52 - 3 10 3 - 3 0 35 - 3 12 20 0.13 52 0 0 - 2 37 32 20 14 26.9 57 256 -85 - 2 33 56 - 2 41 7 - 2 31 39 - 2 43 24 0.13 53 0 0 - 2 8 42 20 14 15.4 56 255 -85 - 2 5 7 - 2 12 17 - 2 2 50 - 2 14 34 0.13 54 0 0 - 1 39 59 20 14 4.0 55 255 -85 - 1 36 24 - 1 43 34 - 1 34 7 - 1 45 51 0.13 55 0 0 - 1 11 23 20 13 52.8 54 254 -85 - 1 7 49 - 1 14 58 - 1 5 32 - 1 17 15 0.12 56 0 0 - 0 42 56 20 13 41.7 53 254 -85 - 0 39 21 - 0 46 30 - 0 37 5 - 0 48 47 0.12 57 0 0 - 0 14 37 20 13 30.8 52 254 -84 - 0 11 2 - 0 18 11 - 0 8 46 - 0 20 28 0.12 58 0 0 0 13 33 20 13 20.1 51 254 -84 0 17 7 0 9 59 0 19 24 0 7 43 0.12 59 0 0 0 41 33 20 13 9.5 50 254 -83 0 45 7 0 37 59 0 47 23 0 35 43 0.12 60 0 0 1 9 23 20 12 59.1 49 253 -82 1 12 56 1 5 49 1 15 12 1 3 33 0.12 61 0 0 1 37 1 20 12 48.8 48 253 -81 1 40 34 1 33 27 1 42 50 1 31 12 0.12 62 0 0 2 4 27 20 12 38.7 47 253 -80 2 8 1 2 0 54 2 10 16 1 58 38 0.12 63 0 0 2 31 41 20 12 28.8 46 253 -79 2 35 14 2 28 8 2 37 30 2 25 53 0.12 64 0 0 2 58 43 20 12 19.1 45 253 -78 3 2 15 2 55 10 3 4 30 2 52 55 0.12 65 0 0 3 25 30 20 12 9.6 44 253 -77 3 29 2 3 21 58 3 31 17 3 19 43 0.12 66 0 0 3 52 3 20 12 0.3 43 253 -76 3 55 35 3 48 31 3 57 50 3 46 16 0.12 67 0 0 4 18 22 20 11 51.2 42 253 -75 4 21 54 4 14 50 4 24 9 4 12 36 0.12 68 0 0 4 44 26 20 11 42.2 41 253 -74 4 47 57 4 40 54 4 50 11 4 38 40 0.12 69 0 0 5 10 13 20 11 33.5 40 253 -73 5 13 44 5 6 42 5 15 59 5 4 28 0.12 70 0 0 5 35 45 20 11 25.0 39 253 -72 5 39 15 5 32 14 5 41 29 5 30 0 0.12 71 0 0 6 0 59 20 11 16.6 37 253 -71 6 4 30 5 57 29 6 6 43 5 55 15 0.12 72 0 0 6 25 57 20 11 8.5 36 253 -70 6 29 27 6 22 26 6 31 40 6 20 13 0.12 73 0 0 6 50 36 20 11 0.6 35 253 -69 6 54 6 6 47 6 6 56 19 6 44 53 0.12 74 0 0 7 14 57 20 10 52.9 34 253 -68 7 18 27 7 11 28 7 20 40 7 9 15 0.12 75 0 0 7 39 0 20 10 45.5 33 253 -67 7 42 29 7 35 31 7 44 42 7 33 18 0.12 76 0 0 8 2 43 20 10 38.2 32 253 -66 8 6 12 7 59 15 8 8 25 7 57 2 0.12 77 0 0 8 26 7 20 10 31.2 31 253 -65 8 29 35 8 22 39 8 31 48 8 20 26 0.12 78 0 0 8 49 11 20 10 24.4 30 253 -64 8 52 39 8 45 43 8 54 51 8 43 31 0.12 79 0 0 9 11 55 20 10 17.8 29 253 -63 9 15 22 9 8 27 9 17 34 9 6 15 0.12 80 0 0 9 34 18 20 10 11.4 28 253 -62 9 37 45 9 30 50 9 39 56 9 28 39 0.12 81 0 0 9 56 19 20 10 5.2 27 253 -61 9 59 46 9 52 52 10 1 58 9 50 41 0.13 82 0 0 10 18 0 20 9 59.3 26 253 -60 10 21 26 10 14 33 10 23 37 10 12 22 0.13 83 0 0 10 39 18 20 9 53.6 25 254 -59 10 42 44 10 35 52 10 44 55 10 33 41 0.13 84 0 0 11 0 14 20 9 48.1 24 254 -58 11 3 40 10 56 49 11 5 51 10 54 38 0.13 85 0 0 11 20 48 20 9 42.9 23 254 -57 11 24 14 11 17 23 11 26 24 11 15 12 0.13 86 0 0 11 41 0 20 9 37.8 22 254 -56 11 44 24 11 37 35 11 46 35 11 35 24 0.13 87 0 0 12 0 48 20 9 33.0 21 254 -55 12 4 12 11 57 23 12 6 22 11 55 13 0.13 88 0 0 12 20 13 20 9 28.5 20 254 -54 12 23 37 12 16 48 12 25 47 12 14 39 0.13 89 0 0 12 39 14 20 9 24.1 19 255 -53 12 42 38 12 35 50 12 44 47 12 33 41 0.13 90 0 0 12 57 51 20 9 20.0 18 255 -52 13 1 15 12 54 28 13 3 24 12 52 19 0.13 91 0 0 13 16 5 20 9 16.1 17 255 -51 13 19 28 13 12 42 13 21 37 13 10 33 0.13 92 0 0 13 33 54 20 9 12.4 16 255 -50 13 37 17 13 30 32 13 39 26 13 28 23 0.13 93 0 0 13 51 19 20 9 9.0 15 256 -49 13 54 41 13 47 57 13 56 50 13 45 48 0.13 94 0 0 14 8 19 20 9 5.7 14 256 -48 14 11 41 14 4 57 14 13 49 14 2 49 0.13 95 0 0 14 24 54 20 9 2.7 13 256 -47 14 28 16 14 21 33 14 30 24 14 19 24 0.13 96 0 0 14 41 4 20 9 0.0 12 256 -46 14 44 25 14 37 43 14 46 33 14 35 35 0.13 97 0 0 14 56 49 20 8 57.4 11 256 -45 15 0 10 14 53 28 15 2 18 14 51 20 0.14 98 0 0 15 12 8 20 8 55.1 10 257 -44 15 15 29 15 8 48 15 17 37 15 6 40 0.14 99 0 0 15 27 2 20 8 53.0 9 257 -43 15 30 22 15 23 42 15 32 30 15 21 35 0.14 100 0 0 15 41 30 20 8 51.1 8 257 -43 15 44 50 15 38 11 15 46 57 15 36 3 0.14 101 0 0 15 55 33 20 8 49.4 7 257 -42 15 58 52 15 52 13 16 0 59 15 50 6 0.14 102 0 0 16 9 9 20 8 48.0 6 258 -41 16 12 28 16 5 50 16 14 35 16 3 43 0.15 103 0 0 16 22 19 20 8 46.7 5 258 -40 16 25 38 16 19 0 16 27 44 16 16 54 0.15 104 0 0 16 35 3 20 8 45.7 4 258 -39 16 38 22 16 31 44 16 40 28 16 29 38 0.16 105 0 0 16 47 20 20 8 44.9 3 259 -38 16 50 39 16 44 2 16 52 45 16 41 56 0.17 106 0 0 16 59 11 20 8 44.3 2 259 -37 17 2 29 16 55 53 17 4 35 16 53 47 0.18 107 0 0 17 10 36 20 8 44.0 1 259 -36 17 13 54 17 7 18 17 15 59 17 5 12 0.23 108 0 0 17 21 34 20 8 43.8 0 259 -35 17 24 51 17 18 16 17 26 57 17 16 10 0.62 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 400-131305 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 38 35.4437 DE: -10 03 41.967 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 38 35.4435 DE: -10 03 41.967 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1888) Zu asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.05500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.010", 0.002", 73.054° remarks: * orbital elements for (1888)Zu : Mean anomaly = 210.6178919549 deg Arg. of pericenter = 233.8762556100 deg Long. of node = 244.7248544624 deg Inclination = 5.8528705476 deg Eccentricity = 0.1694900073 Semimajor axis = 2.5454731970 AU Perihelion dist = 2.1140409264 AU Mag: H = 11.83, G = 0.15 Epoch of elements : MJD 60559.84779812 TDT (2024 Sep 06.8478) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.36,2024,9,6,20.347149,0.057697,-0.121229,-4.439506,-2.097683,0.003351,0.000214,0.000001,0.000000 18.3655,-9.9742,-125.69,6.01,False UCAC4 400-131305,20.64317881,-10.0616575,11.76,11.39,11.19,0.0,0,,20.66578122,-9.9742181,5.06,4.81,0,0,0 1888,Zu,16.44,11.845,2.0550,0,0,-1.285,-8.97,,1.0,0 0,210.4121,2024,9,6,233.8763,244.7249,5.8529,0.16949,2.54547,2.11404,11.83,5.0,0.15 1.318,0.0103,0.0021,73,0.0025,Known errors,1.78,0,-1,-1 20240906_131305,60140.55 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org