IOTA/IOTA-ES occultation update for (175114) 2004 QQ / UCAC4 369-125699 event on 2024 Oct 31, 10:46 UT Visible from Summary ------- On 2024 Oct 31 UT, the 1.566 km diameter asteroid (175114) 2004 QQ will occult a 11.2 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 6.97 mag to 18.20 mag (the magnitude of the asteroid) for at most 0.050 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: 5 * date and approx. time of event: 2024 Oct 31, 10:43 - 2024 Oct 31, 10:49 * geocentric midpoint of event [JD]: 2460614.94900505 * magnitude of target star: 11.23 * magnitude drop [mag]: 6.97 * estimated maximum duration [s]: 0.050 * Moon: 1 % sunlit, 68° distance * Sun: 57° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 13.82 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.106, +/- 0.062) * 1 sigma uncertainty ellipse (major, minor, PA): (0.119", 0.028", 62°) * approx speed of asteroid's shadow [km/s]: 32.0970 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 369-125699 by 175114 2004 QQ on 2024 Oct 31 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 - 26 0 0 -31 15 57 10 43 31.6 0 109 49 -31 16 27 -31 15 28 -31 29 53 -31 2 3 .... - 25 0 0 -31 33 40 10 43 31.6 1 108 50 -31 34 9 -31 33 11 -31 47 35 -31 19 46 0.37 - 24 0 0 -31 51 12 10 43 31.7 2 108 50 -31 51 41 -31 50 42 -32 5 6 -31 37 19 0.40 - 23 0 0 -32 8 31 10 43 31.9 3 107 51 -32 9 1 -32 8 2 -32 22 25 -31 54 39 0.41 - 22 0 0 -32 25 40 10 43 32.1 4 107 52 -32 26 9 -32 25 10 -32 39 32 -32 11 48 0.41 - 21 0 0 -32 42 36 10 43 32.3 5 106 52 -32 43 5 -32 42 6 -32 56 28 -32 28 45 0.42 - 20 0 0 -32 59 19 10 43 32.6 6 106 53 -32 59 49 -32 58 50 -33 13 11 -32 45 30 0.42 - 19 0 0 -33 15 51 10 43 33.0 6 105 54 -33 16 20 -33 15 21 -33 29 41 -33 2 2 0.42 - 18 0 0 -33 32 9 10 43 33.4 7 105 54 -33 32 38 -33 31 40 -33 45 59 -33 18 21 0.42 - 17 0 0 -33 48 14 10 43 33.8 8 104 55 -33 48 43 -33 47 45 -34 2 3 -33 34 27 0.42 - 16 0 0 -34 4 6 10 43 34.3 9 104 56 -34 4 35 -34 3 37 -34 17 54 -33 50 20 0.42 - 15 0 0 -34 19 45 10 43 34.9 10 103 56 -34 20 14 -34 19 16 -34 33 32 -34 5 59 0.42 - 14 0 0 -34 35 10 10 43 35.5 11 102 57 -34 35 39 -34 34 41 -34 48 56 -34 21 25 0.43 - 13 0 0 -34 50 21 10 43 36.1 12 102 58 -34 50 50 -34 49 52 -35 4 6 -34 36 37 0.43 - 12 0 0 -35 5 18 10 43 36.8 13 101 58 -35 5 47 -35 4 49 -35 19 2 -34 51 35 0.43 - 11 0 0 -35 20 1 10 43 37.5 13 101 59 -35 20 30 -35 19 32 -35 33 44 -35 6 19 0.43 - 10 0 0 -35 34 29 10 43 38.3 14 100 59 -35 34 58 -35 34 0 -35 48 12 -35 20 48 0.43 - 9 0 0 -35 48 43 10 43 39.1 15 99 60 -35 49 12 -35 48 14 -36 2 25 -35 35 3 0.43 - 8 0 0 -36 2 42 10 43 40.0 16 99 60 -36 3 11 -36 2 13 -36 16 23 -35 49 3 0.43 - 7 0 0 -36 16 27 10 43 40.9 17 98 61 -36 16 55 -36 15 58 -36 30 6 -36 2 49 0.43 - 6 0 0 -36 29 56 10 43 41.8 18 98 61 -36 30 25 -36 29 27 -36 43 34 -36 16 19 0.43 - 5 0 0 -36 43 10 10 43 42.8 18 97 61 -36 43 39 -36 42 41 -36 56 48 -36 29 34 0.43 - 4 0 0 -36 56 9 10 43 43.8 19 96 62 -36 56 38 -36 55 40 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10 49 33.9 9 256 -43 -16 13 58 -16 12 59 -16 27 22 -15 59 36 0.47 158 0 0 -15 54 13 10 49 34.5 8 255 -44 -15 54 42 -15 53 43 -16 8 6 -15 40 21 0.47 159 0 0 -15 35 6 10 49 35.0 7 255 -45 -15 35 36 -15 34 37 -15 48 59 -15 21 15 0.48 160 0 0 -15 16 10 10 49 35.5 6 255 -46 -15 16 39 -15 15 41 -15 30 1 -15 2 20 0.49 161 0 0 -14 57 24 10 49 35.9 5 255 -47 -14 57 53 -14 56 54 -15 11 14 -14 43 34 0.50 162 0 0 -14 38 48 10 49 36.2 4 254 -47 -14 39 17 -14 38 19 -14 52 38 -14 25 0 0.51 163 0 0 -14 20 24 10 49 36.4 3 254 -48 -14 20 53 -14 19 55 -14 34 13 -14 6 36 0.53 164 0 0 -14 2 11 10 49 36.6 2 254 -49 -14 2 40 -14 1 42 -14 15 59 -13 48 24 0.58 165 0 0 -13 44 9 10 49 36.8 1 254 -50 -13 44 39 -13 43 40 -13 57 57 -13 30 24 0.69 166 0 0 -13 26 21 10 49 36.8 0 253 -51 -13 26 50 -13 25 52 -13 40 7 -13 12 36 1.64 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 369-125699 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 26.4485 DE: -16 15 48.839 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 18 26.4485 DE: -16 15 48.839 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (175114) 2004 QQ asteroid class: approx. diameter [km]: 2 approx. diameter ["]: 0.003 distance from Earth [AU]: 0.63520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#134 date of fit: 2023 Mar 01 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): 0.119", 0.028", 61.708° remarks: * orbital elements for (175114)2004 QQ : Mean anomaly = 6.3845471551 deg Arg. of pericenter = 31.4889096839 deg Long. of node = 288.0797235809 deg Inclination = 5.7189539896 deg Eccentricity = 0.6632844336 Semimajor axis = 2.2497651766 AU Perihelion dist = 0.7575309557 AU Mag: H = 16.64, G = 0.15 Epoch of elements : MJD 60614.44900516 TDT (2024 Oct 31.4490) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Mar01,0.05,2024,10,31,10.776121,0.063148,-0.387865,17.877963,2.929978,-0.003472,-0.000408,0.000001,0.000000 73.0913,-16.2541,14.26,-14.34,False UCAC4 369-125699,18.30734692,-16.2635661,11.37,11.23,11.15,0.0,0,,18.33095548,-16.2541466,6.97,6.59,0,0,0 175114,2004 QQ,18.20,1.566,0.6352,0,0,17.193,40.62,,0.2,0 0,6.2534,2024,10,31,31.4889,288.0797,5.7190,0.66328,2.24977,0.75753,16.64,5.0,0.15 14.730,0.1193,0.0280,62,0.0470,Known errors,0.84,0,-1,-1 20241031_125699,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org