IOTA/IOTA-ES occultation update for (6588) 1985 RC4 / UCAC4 354-178613 event on 2024 Jul 10, 22:54 UT Visible from Summary ------- On 2024 Jul 10 UT, the 9.04804609711166 km diameter asteroid (6588) 1985 RC4 will occult a 8.1 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.18 mag to 16.32 mag (the magnitude of the asteroid) for at most 0.890 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: 93 * date and approx. time of event: 2024 Jul 10, 22:44 - 2024 Jul 10, 23:04 * geocentric midpoint of event [JD]: 2460502.45478175 * magnitude of target star: 8.14 * magnitude drop [mag]: 8.18 * estimated maximum duration [s]: 0.890 * Moon: 23 % sunlit, 127° distance * Sun: 176° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.003", 83°) * approx speed of asteroid's shadow [km/s]: 10.6760 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 354-178613 by 6588 1985 RC4 on 2024 Jul 10 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 - 74 0 0 - 8 31 53 23 4 48.7 0 110 -4 - 8 29 7 - 8 34 38 - 8 26 29 - 8 37 17 .... - 73 0 0 - 8 52 53 23 4 48.6 1 109 -5 - 8 50 8 - 8 55 38 - 8 47 30 - 8 58 17 0.04 - 72 0 0 - 9 13 35 23 4 48.2 2 109 -6 - 9 10 50 - 9 16 20 - 9 8 12 - 9 18 58 -0.02 - 71 0 0 - 9 33 58 23 4 47.7 3 109 -7 - 9 31 13 - 9 36 43 - 9 28 35 - 9 39 21 -0.04 - 70 0 0 - 9 54 2 23 4 47.0 4 109 -8 - 9 51 17 - 9 56 46 - 9 48 40 - 9 59 24 -0.05 - 69 0 0 -10 13 46 23 4 46.0 5 109 -9 -10 11 2 -10 16 30 -10 8 24 -10 19 7 -0.06 - 68 0 0 -10 33 10 23 4 44.9 6 109 -10 -10 30 26 -10 35 54 -10 27 49 -10 38 31 -0.07 - 67 0 0 -10 52 15 23 4 43.6 7 108 -11 -10 49 31 -10 54 58 -10 46 54 -10 57 35 -0.07 - 66 0 0 -11 10 59 23 4 42.1 8 108 -12 -11 8 16 -11 13 42 -11 5 39 -11 16 19 -0.07 - 65 0 0 -11 29 23 23 4 40.5 10 108 -13 -11 26 40 -11 32 6 -11 24 3 -11 34 42 -0.07 - 64 0 0 -11 47 26 23 4 38.6 11 108 -14 -11 44 43 -11 50 9 -11 42 7 -11 52 45 -0.08 - 63 0 0 -12 5 9 23 4 36.6 12 108 -15 -12 2 26 -12 7 51 -11 59 50 -12 10 27 -0.08 - 62 0 0 -12 22 30 23 4 34.4 13 107 -16 -12 19 48 -12 25 13 -12 17 12 -12 27 48 -0.08 - 61 0 0 -12 39 31 23 4 32.0 14 107 -17 -12 36 49 -12 42 13 -12 34 13 -12 44 48 -0.08 - 60 0 0 -12 56 10 23 4 29.4 15 107 -18 -12 53 28 -12 58 52 -12 50 53 -13 1 27 -0.08 - 59 0 0 -13 12 28 23 4 26.7 16 107 -19 -13 9 46 -13 15 9 -13 7 11 -13 17 44 -0.08 - 58 0 0 -13 28 24 23 4 23.8 17 107 -20 -13 25 42 -13 31 5 -13 23 8 -13 33 40 -0.08 - 57 0 0 -13 43 58 23 4 20.7 18 106 -21 -13 41 17 -13 46 40 -13 38 43 -13 49 14 -0.08 - 56 0 0 -13 59 11 23 4 17.5 19 106 -22 -13 56 30 -14 1 52 -13 53 56 -14 4 26 -0.08 - 55 0 0 -14 14 2 23 4 14.2 20 106 -23 -14 11 22 -14 16 43 -14 8 48 -14 19 17 -0.08 - 54 0 0 -14 28 31 23 4 10.6 21 106 -24 -14 25 51 -14 31 12 -14 23 17 -14 33 45 -0.08 - 53 0 0 -14 42 38 23 4 6.9 21 105 -25 -14 39 58 -14 45 18 -14 37 24 -14 47 52 -0.08 - 52 0 0 -14 56 23 23 4 3.1 22 105 -26 -14 53 43 -14 59 3 -14 51 10 -15 1 36 -0.08 - 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1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.025", 0.003", 82.528° remarks: * orbital elements for (6588)1985 RC4 : Mean anomaly = 342.1855268999 deg Arg. of pericenter = 170.7376215499 deg Long. of node = 140.6999082636 deg Inclination = 2.7797885208 deg Eccentricity = 0.0656116125 Semimajor axis = 2.9008623340 AU Perihelion dist = 2.7105320786 AU Mag: H = 12.78, G = 0.15 Epoch of elements : MJD 60501.95478196 TDT (2024 Jul 10.9548) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.89,2024,7,10,22.914762,-0.017832,0.075166,-5.863191,-1.390537,-0.000296,-0.000264,0.000001,0.000000 21.2606,-19.3422,-162.33,22.07,False UCAC4 354-178613,19.59801966,-19.3967129,9.09,8.14,7.63,0.4,0,,19.62225698,-19.3422344,8.18,8.24,0,0,0 6588,1985 RC4,16.32,9.543,1.7061,0,0,-2.135,-7.17,,0.8,0 0,341.9951,2024,7,10,170.7376,140.6999,2.7798,0.06561,2.90086,2.71053,12.78,5.0,0.15 1.479,0.0250,0.0027,83,0.0037,Known errors,1.03,0,-1,-1 20240710_178613,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org