IOTA/IOTA-ES occultation update for (5661) Hildebrand / HIP 105939 event on 2024 Nov 11, 23:57 UT Visible from Summary ------- On 2024 Nov 11 UT, the 38.0011147154755 km diameter asteroid (5661) Hildebrand will occult a 8.5 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.35 mag to 16.83 mag (the magnitude of the asteroid) for at most 2.200 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 Nov 11, 23:51 - 2024 Nov 12, 00:02 * geocentric midpoint of event [JD]: 2460626.49810071 * magnitude of target star: 8.48 * magnitude drop [mag]: 8.35 * estimated maximum duration [s]: 2.200 * Moon: 79 % sunlit, 34° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.002", 57°) * approx speed of asteroid's shadow [km/s]: 17.3326 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 105939 by 5661 Hildebrand on 2024 Nov 11 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 -176 0 0 8 44 51 23 52 5.2 0 99 63 8 32 27 8 57 17 8 26 10 9 3 37 .... -175 0 0 8 35 40 23 52 5.3 1 99 63 8 23 17 8 48 5 8 17 0 8 54 24 -0.28 -174 0 0 8 27 0 23 52 5.5 2 99 63 8 14 37 8 39 24 8 8 21 8 45 42 -0.45 -173 0 0 8 18 50 23 52 5.9 3 99 62 8 6 28 8 31 13 8 0 12 8 37 31 -0.51 -172 0 0 8 11 11 23 52 6.3 4 100 62 7 58 50 8 23 34 7 52 35 8 29 51 -0.54 -171 0 0 8 4 4 23 52 6.9 5 100 62 7 51 43 8 16 26 7 45 28 8 22 43 -0.56 -170 0 0 7 57 27 23 52 7.7 6 100 62 7 45 7 8 9 49 7 38 53 8 16 6 -0.57 -169 0 0 7 51 22 23 52 8.5 7 100 61 7 39 3 8 3 43 7 32 49 8 10 0 -0.58 -168 0 0 7 45 49 23 52 9.6 8 100 61 7 33 30 7 58 9 7 27 16 8 4 26 -0.59 -167 0 0 7 40 47 23 52 10.7 9 100 61 7 28 29 7 53 7 7 22 15 7 59 23 -0.60 -166 0 0 7 36 17 23 52 11.9 10 101 60 7 23 59 7 48 36 7 17 45 7 54 52 -0.60 -165 0 0 7 32 18 23 52 13.3 11 101 60 7 20 1 7 44 38 7 13 47 7 50 53 -0.60 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-0.64 -137 0 0 9 19 29 23 53 42.4 38 109 38 9 6 58 9 32 2 9 0 37 9 38 25 -0.64 -136 0 0 9 31 8 23 53 47.3 39 110 37 9 18 36 9 43 43 9 12 14 9 50 6 -0.64 -135 0 0 9 43 20 23 53 52.2 40 110 36 9 30 46 9 55 56 9 24 24 10 2 20 -0.64 -134 0 0 9 56 3 23 53 57.2 40 111 35 9 43 27 10 8 40 9 37 5 10 15 5 -0.64 -133 0 0 10 9 18 23 54 2.4 41 111 34 9 56 41 10 21 57 9 50 17 10 28 22 -0.64 -132 0 0 10 23 4 23 54 7.6 42 112 33 10 10 26 10 35 45 10 4 2 10 42 11 -0.64 -131 0 0 10 37 22 23 54 12.9 43 113 32 10 24 42 10 50 4 10 18 17 10 56 32 -0.64 -130 0 0 10 52 12 23 54 18.3 44 114 31 10 39 30 11 4 55 10 33 4 11 11 23 -0.64 -129 0 0 11 7 32 23 54 23.8 45 115 30 10 54 49 11 20 17 10 48 22 11 26 46 -0.64 -128 0 0 11 23 23 23 54 29.4 45 115 29 11 10 38 11 36 10 11 4 11 11 42 40 -0.64 -127 0 0 11 39 46 23 54 35.1 46 116 28 11 26 59 11 52 34 11 20 30 11 59 5 -0.64 -126 0 0 11 56 38 23 54 40.8 47 117 27 11 43 50 12 9 29 11 37 20 12 16 0 -0.64 -125 0 0 12 14 1 23 54 46.7 48 118 26 12 1 11 12 26 53 11 54 40 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: HIP 105939 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 27 19.7236 DE: -09 01 55.688 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 27 19.7234 DE: -09 01 55.689 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 8.5 * B mag [mag]: 9.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5661) Hildebrand asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.018 distance from Earth [AU]: 2.88010 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): 0.026", 0.002", 56.804° remarks: * orbital elements for (5661)Hildebrand : Mean anomaly = 13.1612994083 deg Arg. of pericenter = 2.0602372295 deg Long. of node = 317.0348398200 deg Inclination = 13.3182606572 deg Eccentricity = 0.2346974461 Semimajor axis = 3.9581406130 AU Perihelion dist = 3.0291751198 AU Mag: H = 11.14, G = 0.15 Epoch of elements : MJD 60625.99810071 TDT (2024 Nov 11.9981) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,2.20,2024,11,11,23.954417,-0.214882,0.492043,8.960370,3.926738,0.005621,0.001857,0.000000,0.000000 -88.7672,-8.9243,176.72,-17.77,False HIP 105939,21.45547879,-9.0321355,9.00,8.48,8.20,0.1,0,,21.47758116,-8.9242861,8.35,8.19,0,0,0 5661,Hildebrand,16.83,38.210,2.8801,0,0,1.846,11.99,,3.6,0 0,13.0364,2024,11,11,2.0602,317.0348,13.3183,0.23470,3.95814,3.02918,11.14,5.0,0.15 1.254,0.0260,0.0018,57,0.0047,Known errors,1.13,0,-1,-1 20241111_105939,60140.69 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org