IOTA/IOTA-ES occultation update for (2806) Graz / UCAC4 431-000067 event on 2024 Oct 13, 16:06 UT Visible from Summary ------- On 2024 Oct 13 UT, the 13.339 km diameter asteroid (2806) Graz will occult a 11.1 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.41 mag to 16.48 mag (the magnitude of the asteroid) for at most 1.620 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 13, 15:54 - 2024 Oct 13, 16:19 * geocentric midpoint of event [JD]: 2460597.17151321 * magnitude of target star: 11.08 * magnitude drop [mag]: 5.41 * estimated maximum duration [s]: 1.620 * Moon: 81 % sunlit, 31° distance * Sun: 158° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.003", 67°) * approx speed of asteroid's shadow [km/s]: 8.2353 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 431-000067 by 2806 Graz on 2024 Oct 13 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 2 0 0 -31 30 17 16 19 41.3 1 94 21 -31 26 37 -31 33 57 -31 24 47 -31 35 47 .... 3 0 0 -31 33 42 16 19 41.0 2 93 20 -31 30 2 -31 37 22 -31 28 12 -31 39 12 0.14 4 0 0 -31 36 47 16 19 40.6 2 93 19 -31 33 7 -31 40 27 -31 31 17 -31 42 17 0.15 5 0 0 -31 39 31 16 19 40.0 3 92 18 -31 35 51 -31 43 11 -31 34 1 -31 45 1 0.15 6 0 0 -31 41 55 16 19 39.3 4 92 17 -31 38 15 -31 45 35 -31 36 25 -31 47 25 0.16 7 0 0 -31 43 59 16 19 38.4 5 91 17 -31 40 19 -31 47 39 -31 38 29 -31 49 29 0.16 8 0 0 -31 45 43 16 19 37.3 6 91 16 -31 42 3 -31 49 23 -31 40 13 -31 51 12 0.16 9 0 0 -31 47 6 16 19 36.0 7 90 15 -31 43 26 -31 50 46 -31 41 36 -31 52 36 0.16 10 0 0 -31 48 10 16 19 34.5 8 90 14 -31 44 30 -31 51 49 -31 42 40 -31 53 39 0.16 11 0 0 -31 48 53 16 19 32.9 8 89 13 -31 45 13 -31 52 33 -31 43 23 -31 54 23 0.16 12 0 0 -31 49 16 16 19 31.2 9 89 12 -31 45 36 -31 52 56 -31 43 47 -31 54 46 0.16 13 0 0 -31 49 20 16 19 29.2 10 88 12 -31 45 40 -31 52 59 -31 43 50 -31 54 49 0.17 14 0 0 -31 49 3 16 19 27.1 11 88 11 -31 45 23 -31 52 43 -31 43 33 -31 54 33 0.17 15 0 0 -31 48 27 16 19 24.9 12 87 10 -31 44 47 -31 52 7 -31 42 57 -31 53 56 0.17 16 0 0 -31 47 30 16 19 22.4 13 87 9 -31 43 50 -31 51 10 -31 42 1 -31 53 0 0.17 17 0 0 -31 46 14 16 19 19.8 13 86 8 -31 42 34 -31 49 54 -31 40 44 -31 51 44 0.17 18 0 0 -31 44 38 16 19 17.0 14 85 7 -31 40 58 -31 48 18 -31 39 8 -31 50 8 0.17 19 0 0 -31 42 43 16 19 14.1 15 85 7 -31 39 3 -31 46 23 -31 37 13 -31 48 13 0.17 20 0 0 -31 40 27 16 19 11.0 16 84 6 -31 36 47 -31 44 8 -31 34 57 -31 45 58 0.17 21 0 0 -31 37 53 16 19 7.8 17 84 5 -31 34 12 -31 41 33 -31 32 22 -31 43 23 0.17 22 0 0 -31 34 58 16 19 4.4 18 83 4 -31 31 18 -31 38 38 -31 29 28 -31 40 28 0.17 23 0 0 -31 31 44 16 19 0.8 18 83 3 -31 28 3 -31 35 24 -31 26 13 -31 37 15 0.17 24 0 0 -31 28 10 16 18 57.0 19 82 2 -31 24 30 -31 31 51 -31 22 40 -31 33 41 0.17 25 0 0 -31 24 17 16 18 53.1 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24 8 15 59 23.5 52 263 -69 0 28 0 0 20 16 0 29 56 0 18 20 0.16 137 0 0 0 44 22 15 59 12.6 51 263 -68 0 48 14 0 40 30 0 50 10 0 38 34 0.16 138 0 0 1 4 24 15 59 1.9 50 263 -68 1 8 16 1 0 33 1 10 11 0 58 37 0.16 139 0 0 1 24 14 15 58 51.3 49 263 -67 1 28 5 1 20 22 1 30 1 1 18 27 0.16 140 0 0 1 43 51 15 58 40.9 48 263 -66 1 47 42 1 40 0 1 49 37 1 38 4 0.16 141 0 0 2 3 15 15 58 30.6 47 262 -65 2 7 6 1 59 24 2 9 1 1 57 29 0.16 142 0 0 2 22 26 15 58 20.5 46 262 -64 2 26 16 2 18 35 2 28 11 2 16 40 0.16 143 0 0 2 41 23 15 58 10.6 45 262 -64 2 45 13 2 37 32 2 47 8 2 35 37 0.16 144 0 0 3 0 5 15 58 0.9 44 262 -63 3 3 55 2 56 15 3 5 50 2 54 20 0.16 145 0 0 3 18 34 15 57 51.3 43 262 -62 3 22 24 3 14 44 3 24 18 3 12 49 0.16 146 0 0 3 36 48 15 57 42.0 42 262 -61 3 40 37 3 32 58 3 42 32 3 31 3 0.16 147 0 0 3 54 46 15 57 32.8 41 262 -60 3 58 35 3 50 57 4 0 30 3 49 2 0.16 148 0 0 4 12 29 15 57 23.7 40 262 -59 4 16 18 4 8 40 4 18 13 4 6 46 0.16 149 0 0 4 29 57 15 57 14.9 39 262 -58 4 33 46 4 26 8 4 35 40 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0.17 177 0 0 10 35 45 15 54 32.2 12 264 -32 10 39 27 10 32 3 10 41 18 10 30 12 0.18 178 0 0 10 43 56 15 54 29.6 11 264 -31 10 47 38 10 40 14 10 49 29 10 38 23 0.18 179 0 0 10 51 45 15 54 27.2 10 264 -30 10 55 27 10 48 3 10 57 17 10 46 12 0.18 180 0 0 10 59 12 15 54 25.0 9 264 -29 11 2 53 10 55 30 11 4 44 10 53 39 0.18 -179 0 0 11 6 17 15 54 23.0 8 265 -28 11 9 58 11 2 35 11 11 49 11 0 44 0.18 -178 0 0 11 12 59 15 54 21.3 7 265 -27 11 16 41 11 9 18 11 18 31 11 7 27 0.18 -177 0 0 11 19 20 15 54 19.8 6 265 -26 11 23 1 11 15 39 11 24 51 11 13 48 0.19 -176 0 0 11 25 18 15 54 18.6 5 265 -25 11 28 59 11 21 37 11 30 49 11 19 46 0.19 -175 0 0 11 30 53 15 54 17.6 4 265 -24 11 34 34 11 27 12 11 36 25 11 25 22 0.20 -174 0 0 11 36 6 15 54 16.8 3 266 -23 11 39 47 11 32 25 11 41 37 11 30 35 0.21 -173 0 0 11 40 56 15 54 16.2 2 266 -22 11 44 37 11 37 16 11 46 27 11 35 25 0.22 -172 0 0 11 45 24 15 54 15.8 1 266 -21 11 49 4 11 41 43 11 50 55 11 39 53 0.28 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 431-000067 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 02 48.4242 DE: -03 49 24.477 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 02 48.4241 DE: -03 49 24.477 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * B mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2806) Graz asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.36640 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.026", 0.003", 67.36° remarks: * orbital elements for (2806)Graz : Mean anomaly = 302.4886953965 deg Arg. of pericenter = 314.2374412249 deg Long. of node = 116.0361797051 deg Inclination = 2.3404635713 deg Eccentricity = 0.0463871695 Semimajor axis = 2.3782707110 AU Perihelion dist = 2.2679494644 AU Mag: H = 13.36, G = 0.15 Epoch of elements : MJD 60596.67151237 TDT (2024 Oct 13.6715) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,1.62,2024,10,13,16.116317,0.062491,-0.158069,-4.323056,-1.707971,0.001742,0.001131,0.000001,0.000000 96.5698,-3.6838,-65.22,-8.13,False UCAC4 431-000067,0.04678450,-3.8234657,11.53,11.08,10.84,0.0,0,,0.06824048,-3.6837729,5.41,5.20,0,0,0 2806,Graz,16.48,13.339,1.3664,0,0,-1.858,-10.99,,1.2,0 0,302.3082,2024,10,13,314.2374,116.0362,2.3405,0.04639,2.37827,2.26795,13.36,5.0,0.15 1.250,0.0263,0.0033,67,0.0034,Known errors,0.98,0,-1,-1 20241013_000067,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org