IOTA/IOTA-ES occultation update for (504) Cora / UCAC4 492-008073 event on 2024 Sep 15, 03:12 UT Visible from Summary ------- On 2024 Sep 15 UT, the 30.23 km diameter asteroid (504) Cora will occult a 12.0 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.49 mag to 14.36 mag (the magnitude of the asteroid) for at most 2.770 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 15, 03:02 - 2024 Sep 15, 03:21 * geocentric midpoint of event [JD]: 2460568.63360154 * magnitude of target star: 11.99 * magnitude drop [mag]: 2.49 * estimated maximum duration [s]: 2.770 * Moon: 87 % sunlit, 118° distance * Sun: 101° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 68°) * approx speed of asteroid's shadow [km/s]: 10.9272 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 492-008073 by 504 Cora on 2024 Sep 15 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 - 57 0 0 -10 37 10 3 3 0.4 0 81 -77 -10 45 45 -10 28 35 -10 51 8 -10 23 13 .... - 56 0 0 -10 28 18 3 3 0.5 1 81 -78 -10 36 53 -10 19 43 -10 42 16 -10 14 21 0.13 - 55 0 0 -10 19 31 3 3 0.9 2 81 -79 -10 28 6 -10 10 56 -10 33 29 -10 5 34 0.19 - 54 0 0 -10 10 50 3 3 1.4 3 81 -80 -10 19 25 -10 2 15 -10 24 47 - 9 56 53 0.21 - 53 0 0 -10 2 14 3 3 2.1 4 81 -81 -10 10 49 - 9 53 39 -10 16 11 - 9 48 18 0.22 - 52 0 0 - 9 53 44 3 3 3.0 5 80 -81 -10 2 19 - 9 45 10 -10 7 41 - 9 39 48 0.23 - 51 0 0 - 9 45 20 3 3 4.1 6 80 -82 - 9 53 54 - 9 36 45 - 9 59 17 - 9 31 24 0.24 - 50 0 0 - 9 37 2 3 3 5.4 7 80 -83 - 9 45 36 - 9 28 27 - 9 50 58 - 9 23 6 0.24 - 49 0 0 - 9 28 50 3 3 6.8 8 80 -83 - 9 37 24 - 9 20 16 - 9 42 46 - 9 14 54 0.25 - 48 0 0 - 9 20 44 3 3 8.5 9 80 -83 - 9 29 19 - 9 12 10 - 9 34 41 - 9 6 49 0.25 - 47 0 0 - 9 12 46 3 3 10.3 10 80 -84 - 9 21 20 - 9 4 12 - 9 26 42 - 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10 15 3 21 3.5 22 286 48 -16 18 53 -16 1 38 -16 24 17 -15 56 15 0.27 92 0 0 -16 20 33 3 21 7.2 21 286 49 -16 29 10 -16 11 56 -16 34 34 -16 6 32 0.27 93 0 0 -16 30 48 3 21 10.8 20 285 50 -16 39 25 -16 22 11 -16 44 49 -16 16 48 0.27 94 0 0 -16 41 2 3 21 14.3 19 285 51 -16 49 39 -16 32 25 -16 55 3 -16 27 1 0.27 95 0 0 -16 51 13 3 21 17.5 18 285 52 -16 59 50 -16 42 36 -17 5 14 -16 37 13 0.27 96 0 0 -17 1 22 3 21 20.6 17 285 52 -17 9 59 -16 52 45 -17 15 23 -16 47 22 0.27 97 0 0 -17 11 28 3 21 23.5 16 284 53 -17 20 5 -17 2 51 -17 25 29 -16 57 28 0.27 98 0 0 -17 21 32 3 21 26.2 15 284 54 -17 30 9 -17 12 55 -17 35 32 -17 7 32 0.27 99 0 0 -17 31 32 3 21 28.7 14 284 55 -17 40 9 -17 22 56 -17 45 33 -17 17 32 0.27 100 0 0 -17 41 30 3 21 31.1 13 283 55 -17 50 6 -17 32 53 -17 55 30 -17 27 30 0.27 101 0 0 -17 51 24 3 21 33.3 12 283 56 -18 0 0 -17 42 47 -18 5 24 -17 37 24 0.27 102 0 0 -18 1 14 3 21 35.3 11 283 57 -18 9 51 -17 52 38 -18 15 14 -17 47 15 0.27 103 0 0 -18 11 1 3 21 37.1 10 282 57 -18 19 37 -18 2 25 -18 25 1 -17 57 2 0.27 104 0 0 -18 20 44 3 21 38.8 9 282 58 -18 29 20 -18 12 8 -18 34 44 -18 6 45 0.27 105 0 0 -18 30 23 3 21 40.3 8 282 59 -18 38 59 -18 21 47 -18 44 22 -18 16 24 0.27 106 0 0 -18 39 57 3 21 41.6 7 281 59 -18 48 34 -18 31 21 -18 53 57 -18 25 59 0.28 107 0 0 -18 49 28 3 21 42.8 6 281 60 -18 58 4 -18 40 52 -19 3 27 -18 35 29 0.28 108 0 0 -18 58 53 3 21 43.7 5 281 60 -19 7 29 -18 50 17 -19 12 53 -18 44 55 0.28 109 0 0 -19 8 14 3 21 44.5 4 280 61 -19 16 50 -18 59 39 -19 22 13 -18 54 16 0.28 110 0 0 -19 17 30 3 21 45.2 3 280 61 -19 26 6 -19 8 55 -19 31 29 -19 3 32 0.29 111 0 0 -19 26 42 3 21 45.6 2 280 62 -19 35 17 -19 18 6 -19 40 40 -19 12 44 0.30 112 0 0 -19 35 48 3 21 45.9 1 279 62 -19 44 23 -19 27 12 -19 49 46 -19 21 50 0.32 113 0 0 -19 44 48 3 21 46.0 0 279 63 -19 53 24 -19 36 13 -19 58 47 -19 30 51 0.54 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 492-008073 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 43 55.3340 DE: +08 22 11.342 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 43 55.3341 DE: +08 22 11.342 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (504) Cora asteroid class: approx. diameter [km]: 30 approx. diameter ["]: 0.022 distance from Earth [AU]: 1.86160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.015", 0.002", 68.393° remarks: * orbital elements for (504)Cora : Mean anomaly = 33.5986345219 deg Arg. of pericenter = 248.5965366986 deg Long. of node = 104.4387566040 deg Inclination = 12.8984157738 deg Eccentricity = 0.2156629971 Semimajor axis = 2.7226648578 AU Perihelion dist = 2.1354867946 AU Mag: H = 10.05, G = 0.15 Epoch of elements : MJD 60568.13360245 TDT (2024 Sep 15.1336) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,2.77,2024,9,15,3.206437,-0.021106,-0.263066,6.147935,-0.492099,-0.005292,-0.000425,0.000000,0.000000 28.6393,8.4182,130.70,2.86,False UCAC4 492-008073,4.73203721,8.3698173,12.35,11.99,11.80,0.0,0,,4.75445181,8.4181793,2.49,2.26,0,0,0 504,Cora,14.36,30.230,1.8616,0,0,1.957,-2.32,,1.8,0 0,33.5693,2024,9,15,248.5965,104.4388,12.8984,0.21566,2.72266,2.13549,10.05,5.0,0.15 1.313,0.0153,0.0021,68,0.0070,Known errors,1.00,0,-1,-1 20240915_008073,60140.56 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org