IOTA/IOTA-ES occultation update for (4153) Roburnham / HIP 74412 event on 2024 Aug 07, 12:20 UT Visible from Summary ------- On 2024 Aug 07 UT, the 17.015013226124 km diameter asteroid (4153) Roburnham will occult a 6.6 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.98 mag to 17.56 mag (the magnitude of the asteroid) for at most 1.160 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 Aug 07, 12:14 - 2024 Aug 07, 12:27 * geocentric midpoint of event [JD]: 2460530.01453450 * magnitude of target star: 6.58 * magnitude drop [mag]: 10.98 * estimated maximum duration [s]: 1.160 * Moon: 9 % sunlit, 61° distance * Sun: 95° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.001", 107°) * approx speed of asteroid's shadow [km/s]: 15.2994 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 74412 by 4153 Roburnham on 2024 Aug 7 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 - 4 2 42 12 14 25.4 1 108 70 - 4 8 8 - 3 57 16 - 4 9 25 - 3 55 59 .... - 1 0 0 - 4 23 5 12 14 25.6 2 108 69 - 4 28 32 - 4 17 39 - 4 29 49 - 4 16 21 0.35 0 0 0 - 4 43 52 12 14 26.0 3 108 69 - 4 49 19 - 4 38 24 - 4 50 37 - 4 37 7 0.36 1 0 0 - 5 5 1 12 14 26.5 4 108 69 - 5 10 29 - 4 59 33 - 5 11 46 - 4 58 15 0.37 2 0 0 - 5 26 32 12 14 27.2 5 108 68 - 5 32 1 - 5 21 3 - 5 33 19 - 5 19 46 0.37 3 0 0 - 5 48 25 12 14 28.0 6 108 67 - 5 53 55 - 5 42 56 - 5 55 13 - 5 41 38 0.38 4 0 0 - 6 10 41 12 14 29.0 7 108 67 - 6 16 11 - 6 5 11 - 6 17 29 - 6 3 53 0.38 5 0 0 - 6 33 17 12 14 30.1 8 107 66 - 6 38 48 - 6 27 46 - 6 40 6 - 6 26 28 0.38 6 0 0 - 6 56 14 12 14 31.4 9 107 66 - 7 1 46 - 6 50 43 - 7 3 4 - 6 49 24 0.38 7 0 0 - 7 19 32 12 14 32.8 10 107 65 - 7 25 4 - 7 14 0 - 7 26 23 - 7 12 41 0.38 8 0 0 - 7 43 9 12 14 34.4 12 107 64 - 7 48 42 - 7 37 36 - 7 50 1 - 7 36 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180 0 0 -38 20 28 12 27 20.7 7 253 -67 -38 25 57 -38 14 59 -38 27 14 -38 13 42 0.43 -179 0 0 -38 2 51 12 27 21.5 7 252 -67 -38 8 20 -37 57 22 -38 9 38 -37 56 4 0.43 -178 0 0 -37 44 54 12 27 22.2 6 251 -67 -37 50 24 -37 39 24 -37 51 42 -37 38 6 0.44 -177 0 0 -37 26 35 12 27 22.9 5 251 -67 -37 32 6 -37 21 5 -37 33 24 -37 19 47 0.45 -176 0 0 -37 7 57 12 27 23.4 4 250 -67 -37 13 28 -37 2 26 -37 14 47 -37 1 8 0.46 -175 0 0 -36 48 58 12 27 23.8 3 250 -67 -36 54 30 -36 43 26 -36 55 48 -36 42 8 0.49 -174 0 0 -36 29 39 12 27 24.1 2 249 -67 -36 35 12 -36 24 7 -36 36 30 -36 22 48 0.52 -173 0 0 -36 10 0 12 27 24.4 1 248 -67 -36 15 33 -36 4 27 -36 16 52 -36 3 8 0.61 -172 0 0 -35 50 1 12 27 24.5 1 248 -67 -35 55 35 -35 44 28 -35 56 54 -35 43 9 0.97 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: HIP 74412 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 12 26.3858 DE: -18 05 23.886 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 12 26.3854 DE: -18 05 23.884 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 6.6 * B mag [mag]: 7.1 * Diameter [mas]: 0.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4153) Roburnham asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.35080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.025", 0.001", 107.03° remarks: * orbital elements for (4153)Roburnham : Mean anomaly = 345.7510808150 deg Arg. of pericenter = 207.0578038785 deg Long. of node = 66.0485600655 deg Inclination = 1.4249273205 deg Eccentricity = 0.1659429929 Semimajor axis = 3.1464044263 AU Perihelion dist = 2.6242806589 AU Mag: H = 12.51, G = 0.15 Epoch of elements : MJD 60529.51453442 TDT (2024 Aug 07.5145) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,1.16,2024,8,7,12.348828,-0.101350,-0.339630,8.265179,-2.501323,0.005335,-0.001458,0.000000,0.000000 86.7095,-18.1830,-3.79,16.19,False HIP 74412,15.20732942,-18.0899685,7.09,6.58,6.30,0.4,0,,15.23054313,-18.1830312,10.98,10.80,0,0,0 4153,Roburnham,17.56,17.697,2.3508,0,0,2.170,-9.36,,1.4,0 0,345.6602,2024,8,7,207.0578,66.0486,1.4249,0.16594,3.14640,2.62428,12.51,5.0,0.15 1.118,0.0253,0.0012,107,0.0012,Known errors,1.10,0,-1,-1 20240807__74412,60140.24 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org