IOTA/IOTA-ES occultation update for (999) Zachia / G183306.9-141823 event on 2024 Oct 25, 19:02 UT Visible from Summary ------- On 2024 Oct 25 UT, the 17.7602242302278 km diameter asteroid (999) Zachia will occult a 11.8 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 3.82 mag to 15.55 mag (the magnitude of the asteroid) for at most 0.620 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 Oct 25, 18:59 - 2024 Oct 25, 19:05 * geocentric midpoint of event [JD]: 2460609.29336250 * magnitude of target star: 11.76 * magnitude drop [mag]: 3.82 * estimated maximum duration [s]: 0.620 * Moon: 36 % sunlit, 137° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 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]: 31.6934 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G183306.9-141823 by 999 Zachia on 2024 Oct 25 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 -130 0 0 2 40 20 18 59 5.4 0 104 64 2 34 48 2 45 53 2 31 3 2 49 38 2 35 55 2 44 46 .... -129 0 0 2 24 56 18 59 5.5 1 104 65 2 19 24 2 30 29 2 15 39 2 34 14 2 20 31 2 29 22 0.07 -128 0 0 2 9 30 18 59 5.6 2 104 66 2 3 58 2 15 3 2 0 13 2 18 48 2 5 5 2 13 56 0.03 -127 0 0 1 54 3 18 59 5.8 3 104 67 1 48 31 1 59 36 1 44 45 2 3 21 1 49 38 1 58 29 0.01 -126 0 0 1 38 35 18 59 6.0 4 104 68 1 33 2 1 44 8 1 29 17 1 47 53 1 34 9 1 43 1 0.00 -125 0 0 1 23 6 18 59 6.3 5 104 69 1 17 33 1 28 39 1 13 48 1 32 24 1 18 40 1 27 32 0.00 -124 0 0 1 7 37 18 59 6.7 6 105 70 1 2 4 1 13 9 0 58 19 1 16 55 1 3 11 1 12 2 0.00 -123 0 0 0 52 7 18 59 7.1 7 105 71 0 46 35 0 57 40 0 42 50 1 1 25 0 47 42 0 56 33 -0.01 -122 0 0 0 36 38 18 59 7.6 8 105 71 0 31 6 0 42 11 0 27 21 0 45 56 0 32 13 0 41 4 -0.01 -121 0 0 0 21 10 18 59 8.2 9 105 72 0 15 37 0 26 42 0 11 52 0 30 28 0 16 44 0 25 35 -0.01 -120 0 0 0 5 42 18 59 8.8 10 105 73 0 0 10 0 11 15 - 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2 23 49 - 2 12 45 - 2 27 33 - 2 9 0 - 2 22 42 - 2 13 52 -0.01 40 0 0 - 2 3 16 19 5 46.0 8 256 -57 - 2 8 48 - 1 57 44 - 2 12 33 - 1 53 59 - 2 7 41 - 1 58 51 -0.01 41 0 0 - 1 48 12 19 5 46.4 7 256 -58 - 1 53 44 - 1 42 40 - 1 57 29 - 1 38 55 - 1 52 37 - 1 43 46 -0.01 42 0 0 - 1 33 4 19 5 46.8 6 256 -59 - 1 38 36 - 1 27 31 - 1 42 21 - 1 23 47 - 1 37 29 - 1 28 38 -0.01 43 0 0 - 1 17 52 19 5 47.1 5 256 -60 - 1 23 25 - 1 12 20 - 1 27 10 - 1 8 35 - 1 22 18 - 1 13 27 0.00 44 0 0 - 1 2 38 19 5 47.4 4 256 -61 - 1 8 11 - 0 57 6 - 1 11 55 - 0 53 21 - 1 7 4 - 0 58 13 0.00 45 0 0 - 0 47 21 19 5 47.6 3 256 -62 - 0 52 54 - 0 41 49 - 0 56 39 - 0 38 4 - 0 51 47 - 0 42 56 0.01 46 0 0 - 0 32 2 19 5 47.7 2 256 -63 - 0 37 35 - 0 26 30 - 0 41 20 - 0 22 45 - 0 36 28 - 0 27 37 0.03 47 0 0 - 0 16 41 19 5 47.8 1 256 -64 - 0 22 13 - 0 11 8 - 0 25 58 - 0 7 23 - 0 21 6 - 0 12 15 0.12 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: G183306.9-141823 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 33 06.8707 DE: -14 18 23.035 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 33 06.8707 DE: -14 18 23.035 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.500) * V mag [mag]: 11.8 * B mag [mag]: 14.4 * Diameter [mas]: 1.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (999) Zachia asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.33680 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", 84.63° remarks: * orbital elements for (999)Zachia : Mean anomaly = 334.6438378489 deg Arg. of pericenter = 127.9182877708 deg Long. of node = 214.8966194972 deg Inclination = 9.7561092117 deg Eccentricity = 0.2158977246 Semimajor axis = 2.6126491765 AU Perihelion dist = 2.0485841643 AU Mag: H = 10.90, G = 0.15 Epoch of elements : MJD 60608.79336234 TDT (2024 Oct 25.7934) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,0.62,2024,10,25,19.040700,0.000015,0.022954,17.882856,-0.454056,0.004980,0.000646,-0.000001,0.000000 -41.6392,-14.2880,-109.61,-12.46,False G183306.9-141823,18.55190857,-14.3063986,14.41,11.76,10.33,1.2,4,,18.57521641,-14.2880333,3.82,4.78,0,0,0 999,Zachia,15.55,19.794,2.3368,0,0,4.630,-1.71,,1.2,0 0,334.4587,2024,10,25,127.9183,214.8966,9.7561,0.21590,2.61265,2.04858,10.90,5.0,0.15 1.338,0.0120,0.0037,85,0.0039,Known errors,0.95,0,-1,-1 20241025_141823,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org