IOTA/IOTA-ES occultation update for (6588) 1985 RC4 / TYC 6311-01825-1 event on 2024 Oct 22, 12:43 UT Visible from Summary ------- On 2024 Oct 22 UT, the 9.156 km diameter asteroid (6588) 1985 RC4 will occult a 11.3 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 6.78 mag to 18.09 mag (the magnitude of the asteroid) for at most 0.440 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 22, 12:38 - 2024 Oct 22, 12:47 * geocentric midpoint of event [JD]: 2460606.02987046 * magnitude of target star: 11.31 * magnitude drop [mag]: 6.78 * estimated maximum duration [s]: 0.440 * Moon: 69 % sunlit, 163° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 83°) * approx speed of asteroid's shadow [km/s]: 20.9959 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6311-01825-1 by 6588 1985 RC4 on 2024 Oct 22 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 - 27 0 0 -29 36 19 12 38 24.0 1 114 68 -29 39 19 -29 33 19 -29 40 49 -29 31 50 .... - 26 0 0 -29 59 54 12 38 24.2 2 113 68 -30 2 53 -29 56 54 -30 4 23 -29 55 24 0.43 - 25 0 0 -30 23 19 12 38 24.4 3 113 68 -30 26 18 -30 20 19 -30 27 48 -30 18 50 0.44 - 24 0 0 -30 46 33 12 38 24.7 4 112 68 -30 49 33 -30 43 34 -30 51 3 -30 42 5 0.44 - 23 0 0 -31 9 38 12 38 25.1 5 112 68 -31 12 37 -31 6 39 -31 14 7 -31 5 9 0.45 - 22 0 0 -31 32 31 12 38 25.6 6 111 68 -31 35 30 -31 29 32 -31 37 0 -31 28 3 0.45 - 21 0 0 -31 55 13 12 38 26.2 7 111 68 -31 58 12 -31 52 14 -31 59 42 -31 50 45 0.45 - 20 0 0 -32 17 43 12 38 26.9 8 110 68 -32 20 42 -32 14 44 -32 22 11 -32 13 15 0.45 - 19 0 0 -32 40 0 12 38 27.7 8 110 68 -32 42 59 -32 37 2 -32 44 28 -32 35 33 0.45 - 18 0 0 -33 2 5 12 38 28.5 9 109 68 -33 5 4 -32 59 7 -33 6 33 -32 57 38 0.45 - 17 0 0 -33 23 57 12 38 29.4 10 109 68 -33 26 55 -33 20 58 -33 28 24 -33 19 29 0.45 - 16 0 0 -33 45 34 12 38 30.4 11 108 67 -33 48 33 -33 42 36 -33 50 1 -33 41 7 0.45 - 15 0 0 -34 6 58 12 38 31.5 12 107 67 -34 9 56 -34 4 0 -34 11 25 -34 2 31 0.46 - 14 0 0 -34 28 7 12 38 32.6 13 107 67 -34 31 5 -34 25 10 -34 32 34 -34 23 41 0.46 - 13 0 0 -34 49 2 12 38 33.8 14 106 67 -34 52 0 -34 46 5 -34 53 28 -34 44 36 0.46 - 12 0 0 -35 9 42 12 38 35.1 15 106 66 -35 12 39 -35 6 44 -35 14 7 -35 5 16 0.46 - 11 0 0 -35 30 6 12 38 36.5 16 105 66 -35 33 3 -35 27 9 -35 34 31 -35 25 40 0.46 - 10 0 0 -35 50 14 12 38 37.9 17 104 65 -35 53 11 -35 47 17 -35 54 39 -35 45 49 0.46 - 9 0 0 -36 10 6 12 38 39.4 17 104 65 -36 13 3 -36 7 10 -36 14 31 -36 5 42 0.46 - 8 0 0 -36 29 42 12 38 41.0 18 103 64 -36 32 39 -36 26 46 -36 34 7 -36 25 18 0.46 - 7 0 0 -36 49 2 12 38 42.6 19 102 64 -36 51 58 -36 46 6 -36 53 26 -36 44 38 0.46 - 6 0 0 -37 8 5 12 38 44.3 20 102 63 -37 11 1 -37 5 9 -37 12 28 -37 3 41 0.46 - 5 0 0 -37 26 50 12 38 46.0 21 101 63 -37 29 46 -37 23 55 -37 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48 23 -16 39 32 0.72 168 0 0 -16 20 22 12 47 37.4 0 248 -62 -16 23 19 -16 17 25 -16 24 47 -16 15 56 1.28 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6311-01825-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 40 17.3337 DE: -21 08 03.212 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 40 17.3334 DE: -21 08 03.212 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.3 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6588) 1985 RC4 asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.62740 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 25 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", 0.001", 82.526° remarks: * orbital elements for (6588)1985 RC4 : Mean anomaly = 2.8424378576 deg Arg. of pericenter = 170.7442418772 deg Long. of node = 140.6990200619 deg Inclination = 2.7799167750 deg Eccentricity = 0.0655181651 Semimajor axis = 2.9005739120 AU Perihelion dist = 2.7105336315 AU Mag: H = 12.78, G = 0.15 Epoch of elements : MJD 60605.52986995 TDT (2024 Oct 22.5299) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.44,2024,10,22,12.716891,0.051160,-0.408211,11.760940,1.455602,0.005659,0.000981,0.000000,0.000000 73.2437,-21.0778,-14.66,-11.33,False TYC 6311-01825-1,19.67148160,-21.1342254,11.64,11.31,11.13,0.0,0,,19.69581354,-21.0778347,6.78,6.51,0,0,0 6588,1985 RC4,18.09,9.156,2.6274,0,0,2.813,4.88,,0.8,0 0,2.7367,2024,10,22,170.7442,140.6990,2.7799,0.06552,2.90057,2.71053,12.78,5.0,0.15 1.249,0.0150,0.0012,83,0.0012,Known errors,1.14,0,-1,-1 20241022_1825-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org