IOTA/IOTA-ES occultation update for (42708) 1998 QD11 / HIP 6491 event on 2024 Oct 07, 22:05 UT Visible from Summary ------- On 2024 Oct 07 UT, the 12.167 km diameter asteroid (42708) 1998 QD11 will occult a 9.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.28 mag to 18.04 mag (the magnitude of the asteroid) for at most 0.930 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: 79 * date and approx. time of event: 2024 Oct 07, 21:58 - 2024 Oct 07, 22:12 * geocentric midpoint of event [JD]: 2460591.42048600 * magnitude of target star: 9.76 * magnitude drop [mag]: 8.28 * estimated maximum duration [s]: 0.930 * Moon: 22 % sunlit, 115° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.006", 66°) * approx speed of asteroid's shadow [km/s]: 13.1246 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 6491 by 42708 1998 QD11 on 2024 Oct 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 - 86 0 0 -52 19 8 22 12 28.7 1 123 17 -52 14 35 -52 23 41 -52 8 20 -52 29 57 .... - 85 0 0 -52 43 20 22 12 28.5 1 122 16 -52 38 48 -52 47 51 -52 32 34 -52 54 7 0.55 - 84 0 0 -53 6 58 22 12 28.3 2 122 15 -53 2 28 -53 11 28 -52 56 15 -53 17 42 0.56 - 83 0 0 -53 30 2 22 12 28.0 3 121 15 -53 25 33 -53 34 32 -53 19 23 -53 40 44 0.56 - 82 0 0 -53 52 34 22 12 27.6 3 120 14 -53 48 6 -53 57 2 -53 41 57 -54 3 12 0.56 - 81 0 0 -54 14 32 22 12 27.1 4 119 13 -54 10 6 -54 18 59 -54 3 58 -54 25 8 0.57 - 80 0 0 -54 35 58 22 12 26.6 5 118 13 -54 31 33 -54 40 24 -54 25 27 -54 46 31 0.57 - 79 0 0 -54 56 52 22 12 26.0 6 118 12 -54 52 28 -55 1 17 -54 46 23 -55 7 22 0.57 - 78 0 0 -55 17 14 22 12 25.3 6 117 12 -55 12 51 -55 21 38 -55 6 48 -55 27 42 0.57 - 77 0 0 -55 37 5 22 12 24.6 7 116 11 -55 32 43 -55 41 27 -55 26 42 -55 47 30 0.57 - 76 0 0 -55 56 25 22 12 23.8 7 115 10 -55 52 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41 -11 51 18 0.59 109 0 0 -11 8 35 21 58 58.3 18 252 -7 -11 4 16 -11 12 54 -10 58 19 -11 18 52 0.59 110 0 0 -10 36 42 21 58 55.0 17 252 -6 -10 32 24 -10 41 0 -10 26 29 -10 46 56 0.59 111 0 0 -10 5 21 21 58 51.9 16 252 -5 -10 1 5 -10 9 38 - 9 55 11 -10 15 33 0.59 112 0 0 - 9 34 33 21 58 49.1 15 251 -4 - 9 30 17 - 9 38 48 - 9 24 24 - 9 44 42 0.60 113 0 0 - 9 4 17 21 58 46.4 14 251 -3 - 9 0 2 - 9 8 32 - 8 54 11 - 9 14 24 0.60 114 0 0 - 8 34 35 21 58 43.9 13 251 -2 - 8 30 21 - 8 38 49 - 8 24 31 - 8 44 39 0.60 115 0 0 - 8 5 27 21 58 41.7 12 251 -1 - 8 1 14 - 8 9 40 - 7 55 26 - 8 15 29 0.61 116 0 0 - 7 36 54 21 58 39.6 10 251 0 - 7 32 42 - 7 41 6 - 7 26 55 - 7 46 53 0.61 117 0 0 - 7 8 56 21 58 37.8 9 251 0 - 7 4 45 - 7 13 7 - 6 59 0 - 7 18 53 0.62 118 0 0 - 6 41 34 21 58 36.1 8 250 1 - 6 37 24 - 6 45 44 - 6 31 40 - 6 51 29 0.62 119 0 0 - 6 14 48 21 58 34.7 7 250 2 - 6 10 39 - 6 18 56 - 6 4 56 - 6 24 40 0.63 120 0 0 - 5 48 38 21 58 33.4 6 250 3 - 5 44 30 - 5 52 46 - 5 38 48 - 5 58 28 0.64 121 0 0 - 5 23 5 21 58 32.4 5 250 4 - 5 18 58 - 5 27 12 - 5 13 18 - 5 32 53 0.66 122 0 0 - 4 58 9 21 58 31.5 4 250 5 - 4 54 3 - 5 2 16 - 4 48 24 - 5 7 56 0.68 123 0 0 - 4 33 51 21 58 30.9 3 250 6 - 4 29 46 - 4 37 57 - 4 24 8 - 4 43 35 0.72 124 0 0 - 4 10 11 21 58 30.5 2 250 7 - 4 6 7 - 4 14 16 - 4 0 30 - 4 19 53 0.80 125 0 0 - 3 47 9 21 58 30.2 1 250 8 - 3 43 6 - 3 51 13 - 3 37 30 - 3 56 49 1.10 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: HIP 6491 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 23 24.2648 DE: -20 19 11.783 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 23 24.2648 DE: -20 19 11.785 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.8 * B mag [mag]: 10.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42708) 1998 QD11 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.91270 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.020", 0.006", 66.453° remarks: * orbital elements for (42708)1998 QD11 : Mean anomaly = 103.9379448318 deg Arg. of pericenter = 125.5979299870 deg Long. of node = 123.2749391519 deg Inclination = 18.8744587431 deg Eccentricity = 0.2000388875 Semimajor axis = 2.6225077999 AU Perihelion dist = 2.0979042572 AU Mag: H = 13.75, G = 0.15 Epoch of elements : MJD 60590.92048588 TDT (2024 Oct 07.9205) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.93,2024,10,7,22.091664,0.224987,-0.450498,-6.627672,-3.309168,-0.000701,0.002548,0.000001,0.000001 32.7406,-20.1884,-154.48,-5.96,False HIP 6491,1.39007355,-20.3199397,9.96,9.76,9.65,0.0,0,,1.41040196,-20.1884001,8.28,7.94,0,0,0 42708,1998 QD11,18.04,12.167,1.9127,0,0,-2.164,-15.21,,0.8,0 0,103.7243,2024,10,7,125.5979,123.2749,18.8745,0.20004,2.62251,2.09790,13.75,5.0,0.15 1.690,0.0200,0.0060,66,0.0061,Known errors,0.89,0,-1,-1 20241007_P_6491,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org