IOTA/IOTA-ES occultation update for (999) Zachia / UCAC4 379-112419 event on 2024 Oct 24, 07:47 UT Visible from Summary ------- On 2024 Oct 24 UT, the 17.883 km diameter asteroid (999) Zachia will occult a 11.9 mag star in the constellation Scutum for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.73 mag to 15.54 mag (the magnitude of the asteroid) for at most 0.570 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: 98 * date and approx. time of event: 2024 Oct 24, 07:44 - 2024 Oct 24, 07:51 * geocentric midpoint of event [JD]: 2460607.82481162 * magnitude of target star: 11.85 * magnitude drop [mag]: 3.73 * estimated maximum duration [s]: 0.570 * Moon: 51 % sunlit, 153° distance * Sun: 67° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.004", 85°) * approx speed of asteroid's shadow [km/s]: 31.2454 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 379-112419 by 999 Zachia on 2024 Oct 24 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 40 0 0 3 45 21 7 44 19.8 0 104 65 3 40 21 3 50 22 3 36 39 3 54 4 .... 41 0 0 3 29 58 7 44 19.9 1 104 66 3 24 57 3 34 58 3 21 15 3 38 40 0.04 42 0 0 3 14 32 7 44 20.0 2 104 67 3 9 31 3 19 33 3 5 50 3 23 14 0.01 43 0 0 2 59 4 7 44 20.2 3 105 67 2 54 4 3 4 5 2 50 22 3 7 47 0.00 44 0 0 2 43 36 7 44 20.5 5 105 68 2 38 35 2 48 36 2 34 53 2 52 18 -0.01 45 0 0 2 28 6 7 44 20.8 6 105 69 2 23 5 2 33 6 2 19 23 2 36 48 -0.01 46 0 0 2 12 35 7 44 21.2 7 105 70 2 7 34 2 17 36 2 3 53 2 21 18 -0.02 47 0 0 1 57 4 7 44 21.6 8 105 71 1 52 3 2 2 5 1 48 22 2 5 47 -0.02 48 0 0 1 41 33 7 44 22.1 9 105 72 1 36 32 1 46 34 1 32 51 1 50 16 -0.02 49 0 0 1 26 2 7 44 22.7 10 105 73 1 21 2 1 31 3 1 17 20 1 34 45 -0.02 50 0 0 1 10 32 7 44 23.4 11 105 74 1 5 31 1 15 33 1 1 50 1 19 15 -0.02 51 0 0 0 55 3 7 44 24.1 12 105 74 0 50 2 1 0 4 0 46 21 1 3 45 -0.02 52 0 0 0 39 35 7 44 24.9 13 105 75 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0 0 - 4 3 51 7 50 57.3 18 256 -48 - 4 8 50 - 3 58 52 - 4 12 31 - 3 55 12 -0.03 -160 0 0 - 3 49 50 7 50 58.4 17 256 -49 - 3 54 49 - 3 44 51 - 3 58 29 - 3 41 10 -0.03 -159 0 0 - 3 35 41 7 50 59.5 16 256 -50 - 3 40 40 - 3 30 42 - 3 44 21 - 3 27 1 -0.03 -158 0 0 - 3 21 26 7 51 0.5 15 256 -51 - 3 26 25 - 3 16 26 - 3 30 6 - 3 12 46 -0.03 -157 0 0 - 3 7 4 7 51 1.5 14 256 -52 - 3 12 3 - 3 2 4 - 3 15 44 - 2 58 24 -0.03 -156 0 0 - 2 52 36 7 51 2.3 13 256 -53 - 2 57 36 - 2 47 36 - 3 1 16 - 2 43 56 -0.03 -155 0 0 - 2 38 2 7 51 3.1 12 256 -54 - 2 43 2 - 2 33 2 - 2 46 43 - 2 29 21 -0.03 -154 0 0 - 2 23 22 7 51 3.9 11 256 -55 - 2 28 22 - 2 18 23 - 2 32 3 - 2 14 42 -0.03 -153 0 0 - 2 8 38 7 51 4.6 10 256 -56 - 2 13 37 - 2 3 38 - 2 17 19 - 1 59 57 -0.03 -152 0 0 - 1 53 48 7 51 5.2 9 256 -57 - 1 58 48 - 1 48 48 - 2 2 29 - 1 45 7 -0.03 -151 0 0 - 1 38 53 7 51 5.7 8 256 -58 - 1 43 53 - 1 33 53 - 1 47 34 - 1 30 12 -0.03 -150 0 0 - 1 23 54 7 51 6.2 7 256 -59 - 1 28 54 - 1 18 54 - 1 32 36 - 1 15 13 -0.02 -149 0 0 - 1 8 51 7 51 6.7 6 256 -60 - 1 13 51 - 1 3 51 - 1 17 33 - 1 0 10 -0.02 -148 0 0 - 0 53 44 7 51 7.0 5 256 -61 - 0 58 45 - 0 48 44 - 1 2 26 - 0 45 3 -0.02 -147 0 0 - 0 38 34 7 51 7.3 4 256 -62 - 0 43 34 - 0 33 34 - 0 47 16 - 0 29 52 -0.02 -146 0 0 - 0 23 21 7 51 7.5 3 256 -63 - 0 28 21 - 0 18 20 - 0 32 2 - 0 14 39 -0.01 -145 0 0 - 0 8 4 7 51 7.7 2 256 -64 - 0 13 5 - 0 3 4 - 0 16 46 0 0 38 0.00 -144 0 0 0 7 14 7 51 7.8 1 256 -65 0 2 14 0 12 15 - 0 1 28 0 15 57 0.05 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 379-112419 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 30 24.4178 DE: -14 17 10.287 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 30 24.4177 DE: -14 17 10.287 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (999) Zachia asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.32400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.012", 0.004", 84.726° remarks: * orbital elements for (999)Zachia : Mean anomaly = 334.3013064601 deg Arg. of pericenter = 127.9180516291 deg Long. of node = 214.8966329136 deg Inclination = 9.7561092714 deg Eccentricity = 0.2158988035 Semimajor axis = 2.6126535140 AU Perihelion dist = 2.0485847463 AU Mag: H = 10.90, G = 0.15 Epoch of elements : MJD 60607.32481138 TDT (2024 Oct 24.3248) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,0.57,2024,10,24,7.795479,0.000772,0.037485,17.627115,-0.552967,0.005004,0.000614,-0.000001,0.000000 127.8098,-14.2694,59.11,-11.96,False UCAC4 379-112419,18.50678276,-14.2861907,12.64,11.85,11.42,0.0,0,,18.53009190,-14.2694073,3.73,3.71,0,0,0 999,Zachia,15.54,17.883,2.3240,0,0,4.589,-2.09,,1.2,0 0,334.2255,2024,10,24,127.9181,214.8966,9.7561,0.21590,2.61265,2.04858,10.90,5.0,0.15 1.369,0.0120,0.0037,85,0.0039,Known errors,0.93,0,-1,-1 20241024_112419,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org