IOTA/IOTA-ES occultation update for (4294) Horatius / UCAC4 390-058386 event on 2024 Jul 25, 09:22 UT Visible from Summary ------- On 2024 Jul 25 UT, the 8.45 km diameter asteroid (4294) Horatius will occult a 11.6 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.91 mag to 18.55 mag (the magnitude of the asteroid) for at most 0.380 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 Jul 25, 09:17 - 2024 Jul 25, 09:27 * geocentric midpoint of event [JD]: 2460516.89078091 * magnitude of target star: 11.64 * magnitude drop [mag]: 6.91 * estimated maximum duration [s]: 0.380 * Moon: 80 % sunlit, 154° distance * Sun: 78° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 8 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 116°) * approx speed of asteroid's shadow [km/s]: 22.3833 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 390-058386 by 4294 Horatius on 2024 Jul 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 30 0 0 19 42 21 9 17 58.6 1 103 78 19 39 59 19 44 42 19 38 15 19 46 27 .... 31 0 0 19 28 49 9 17 58.7 2 104 79 19 26 28 19 31 10 19 24 43 19 32 55 0.05 32 0 0 19 14 55 9 17 58.9 3 104 80 19 12 34 19 17 17 19 10 49 19 19 2 0.03 33 0 0 19 0 40 9 17 59.1 3 104 81 18 58 18 19 3 2 18 56 33 19 4 47 0.02 34 0 0 18 46 3 9 17 59.4 4 105 82 18 43 41 18 48 25 18 41 55 18 50 10 0.02 35 0 0 18 31 4 9 17 59.9 5 105 83 18 28 42 18 33 26 18 26 56 18 35 12 0.01 36 0 0 18 15 43 9 18 0.4 6 105 84 18 13 21 18 18 6 18 11 35 18 19 52 0.01 37 0 0 18 0 1 9 18 1.0 7 105 85 17 57 39 18 2 24 17 55 53 18 4 10 0.01 38 0 0 17 43 58 9 18 1.6 8 106 85 17 41 35 17 46 21 17 39 49 17 48 7 0.01 39 0 0 17 27 34 9 18 2.4 9 106 86 17 25 11 17 29 57 17 23 25 17 31 43 0.01 40 0 0 17 10 48 9 18 3.2 10 106 87 17 8 25 17 13 12 17 6 39 17 14 58 0.01 41 0 0 16 53 42 9 18 4.2 11 107 87 16 51 19 16 56 6 16 49 32 16 57 52 0.01 42 0 0 16 36 15 9 18 5.2 12 107 87 16 33 51 16 38 39 16 32 5 16 40 26 0.01 43 0 0 16 18 28 9 18 6.3 13 107 86 16 16 4 16 20 51 16 14 17 16 22 38 0.01 44 0 0 16 0 20 9 18 7.5 14 108 86 15 57 56 16 2 44 15 56 8 16 4 31 0.01 45 0 0 15 41 52 9 18 8.8 15 108 85 15 39 27 15 44 16 15 37 40 15 46 3 0.01 46 0 0 15 23 4 9 18 10.2 16 108 84 15 20 39 15 25 28 15 18 52 15 27 16 0.01 47 0 0 15 3 56 9 18 11.7 17 108 83 15 1 31 15 6 21 14 59 44 15 8 9 0.01 48 0 0 14 44 29 9 18 13.3 19 109 82 14 42 4 14 46 54 14 40 16 14 48 42 0.00 49 0 0 14 24 43 9 18 15.0 20 109 82 14 22 18 14 27 8 14 20 30 14 28 56 0.00 50 0 0 14 4 38 9 18 16.7 21 109 81 14 2 13 14 7 4 14 0 25 14 8 52 0.00 51 0 0 13 44 14 9 18 18.6 22 109 80 13 41 49 13 46 40 13 40 0 13 48 28 0.00 52 0 0 13 23 33 9 18 20.5 23 110 79 13 21 7 13 25 58 13 19 18 13 27 47 0.00 53 0 0 13 2 33 9 18 22.5 24 110 78 13 0 6 13 4 59 12 58 18 13 6 47 0.00 54 0 0 12 41 15 9 18 24.7 25 110 77 12 38 49 12 43 41 12 37 0 12 45 30 0.00 55 0 0 12 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39 3 -22 45 20 -22 37 21 -0.01 -179 0 0 -22 38 8 9 27 2.6 24 266 -54 -22 40 26 -22 35 51 -22 42 8 -22 34 8 -0.01 -178 0 0 -22 34 33 9 27 4.5 24 266 -55 -22 36 51 -22 32 15 -22 38 33 -22 30 33 -0.01 -177 0 0 -22 30 35 9 27 6.3 23 266 -55 -22 32 53 -22 28 17 -22 34 35 -22 26 35 0.00 -176 0 0 -22 26 13 9 27 8.1 22 265 -56 -22 28 31 -22 23 56 -22 30 14 -22 22 13 0.00 -175 0 0 -22 21 29 9 27 9.7 21 265 -57 -22 23 47 -22 19 11 -22 25 29 -22 17 28 0.00 -174 0 0 -22 16 21 9 27 11.4 20 264 -58 -22 18 39 -22 14 3 -22 20 22 -22 12 21 0.00 -173 0 0 -22 10 51 9 27 12.9 19 264 -59 -22 13 9 -22 8 33 -22 14 51 -22 6 50 0.00 -172 0 0 -22 4 57 9 27 14.4 18 264 -60 -22 7 15 -22 2 39 -22 8 58 -22 0 56 0.00 -171 0 0 -21 58 40 9 27 15.8 17 263 -61 -22 0 59 -21 56 22 -22 2 42 -21 54 39 0.00 -170 0 0 -21 52 1 9 27 17.1 16 263 -62 -21 54 19 -21 49 43 -21 56 2 -21 48 0 0.00 -169 0 0 -21 44 59 9 27 18.4 15 263 -63 -21 47 17 -21 42 40 -21 49 0 -21 40 57 0.00 -168 0 0 -21 37 33 9 27 19.6 14 262 -64 -21 39 52 -21 35 15 -21 41 35 -21 33 32 0.00 -167 0 0 -21 29 45 9 27 20.7 13 262 -65 -21 32 4 -21 27 27 -21 33 47 -21 25 44 0.00 -166 0 0 -21 21 35 9 27 21.7 12 261 -66 -21 23 54 -21 19 16 -21 25 37 -21 17 33 0.00 -165 0 0 -21 13 1 9 27 22.7 11 261 -67 -21 15 20 -21 10 42 -21 17 4 -21 8 59 0.00 -164 0 0 -21 4 5 9 27 23.6 10 261 -68 -21 6 24 -21 1 46 -21 8 8 -21 0 3 0.00 -163 0 0 -20 54 47 9 27 24.4 9 260 -69 -20 57 6 -20 52 27 -20 58 49 -20 50 44 0.00 -162 0 0 -20 45 5 9 27 25.1 8 260 -69 -20 47 25 -20 42 46 -20 49 9 -20 41 2 0.00 -161 0 0 -20 35 2 9 27 25.8 8 260 -70 -20 37 21 -20 32 42 -20 39 5 -20 30 58 0.00 -160 0 0 -20 24 36 9 27 26.4 7 259 -71 -20 26 56 -20 22 16 -20 28 40 -20 20 32 0.01 -159 0 0 -20 13 48 9 27 26.9 6 259 -72 -20 16 8 -20 11 28 -20 17 52 -20 9 44 0.01 -158 0 0 -20 2 37 9 27 27.3 5 259 -73 -20 4 57 -20 0 17 -20 6 41 -19 58 33 0.01 -157 0 0 -19 51 5 9 27 27.7 4 258 -74 -19 53 25 -19 48 44 -19 55 9 -19 47 0 0.02 -156 0 0 -19 39 10 9 27 27.9 3 258 -75 -19 41 30 -19 36 49 -19 43 15 -19 35 5 0.02 -155 0 0 -19 26 53 9 27 28.1 2 258 -76 -19 29 14 -19 24 33 -19 30 59 -19 22 48 0.04 -154 0 0 -19 14 15 9 27 28.2 1 257 -77 -19 16 36 -19 11 54 -19 18 20 -19 10 9 0.09 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 390-058386 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 10 45.7751 DE: -12 06 31.320 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 10 45.7749 DE: -12 06 31.319 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.6 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4294) Horatius asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.87460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 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", 0.000", 116.398° remarks: * orbital elements for (4294)Horatius : Mean anomaly = 219.2378942593 deg Arg. of pericenter = 24.1353839848 deg Long. of node = 339.6280354810 deg Inclination = 4.8735987388 deg Eccentricity = 0.0211131399 Semimajor axis = 2.8026644378 AU Perihelion dist = 2.7434913913 AU Mag: H = 12.97, G = 0.15 Epoch of elements : MJD 60516.39078112 TDT (2024 Jul 25.3908) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Apr24,0.38,2024,7,25,9.378742,0.002504,0.006484,11.887183,-4.278658,0.005007,-0.002140,0.000000,0.000000 113.7504,-12.2394,40.96,19.50,False UCAC4 390-058386,13.17938198,-12.1087002,11.94,11.64,11.48,0.0,0,K,13.20081848,-12.2393760,6.91,6.62,0,0,0 4294,Horatius,18.55,8.450,2.8746,0,0,2.481,-13.09,,0.8,0 0,219.1558,2024,7,25,24.1354,339.6280,4.8736,0.02111,2.80266,2.74349,12.97,5.0,0.15 1.372,0.0123,0.0005,116,0.0015,Known errors,1.66,0,-1,-1 20240725_058386,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org