IOTA/IOTA-ES occultation update for (175114) 2004 QQ / UCAC4 365-112309 event on 2024 Oct 27, 09:54 UT Visible from Summary ------- On 2024 Oct 27 UT, the 1.53242135218413 km diameter asteroid (175114) 2004 QQ will occult a 13.5 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 4.78 mag to 18.25 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 27, 09:50 - 2024 Oct 27, 09:57 * geocentric midpoint of event [JD]: 2460610.91272896 * magnitude of target star: 13.48 * magnitude drop [mag]: 4.78 * estimated maximum duration [s]: 0.050 * Moon: 22 % sunlit, 109° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 13.37 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.094, +/- 0.053) * 1 sigma uncertainty ellipse (major, minor, PA): (0.105", 0.026", 63°) * approx speed of asteroid's shadow [km/s]: 31.7239 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 365-112309 by 175114 2004 QQ on 2024 Oct 27 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 - 9 0 0 -11 18 25 9 50 59.5 0 107 54 -11 18 52 -11 17 58 -11 31 7 -11 5 43 .... - 8 0 0 -11 37 1 9 50 59.5 1 107 55 -11 37 29 -11 36 34 -11 49 43 -11 24 20 0.13 - 7 0 0 -11 55 29 9 50 59.6 2 107 56 -11 55 56 -11 55 2 -12 8 10 -11 42 48 0.11 - 6 0 0 -12 13 47 9 50 59.8 3 107 57 -12 14 14 -12 13 20 -12 26 27 -12 1 6 0.10 - 5 0 0 -12 31 55 9 51 0.1 4 107 58 -12 32 21 -12 31 28 -12 44 35 -12 19 15 0.10 - 4 0 0 -12 49 52 9 51 0.4 5 106 59 -12 50 19 -12 49 25 -13 2 32 -12 37 13 0.09 - 3 0 0 -13 7 39 9 51 0.7 6 106 60 -13 8 6 -13 7 12 -13 20 18 -12 55 1 0.09 - 2 0 0 -13 25 16 9 51 1.2 7 106 61 -13 25 43 -13 24 49 -13 37 54 -13 12 37 0.09 - 1 0 0 -13 42 41 9 51 1.7 8 106 62 -13 43 8 -13 42 14 -13 55 19 -13 30 3 0.09 0 0 0 -13 59 54 9 51 2.2 9 106 63 -14 0 21 -13 59 27 -14 12 31 -13 47 17 0.09 1 0 0 -14 16 56 9 51 2.8 10 105 64 -14 17 23 -14 16 29 -14 29 32 -14 4 19 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164 0 0 0 13 18 9 57 38.3 8 253 -46 0 12 51 0 13 45 0 0 33 0 26 3 0.10 165 0 0 0 32 58 9 57 38.8 7 253 -47 0 32 31 0 33 25 0 20 13 0 45 42 0.10 166 0 0 0 52 31 9 57 39.2 6 253 -48 0 52 4 0 52 58 0 39 47 1 5 15 0.11 167 0 0 1 11 57 9 57 39.6 5 253 -49 1 11 30 1 12 24 0 59 13 1 24 40 0.11 168 0 0 1 31 15 9 57 39.9 4 253 -50 1 30 48 1 31 42 1 18 32 1 43 58 0.12 169 0 0 1 50 25 9 57 40.1 3 253 -51 1 49 58 1 50 52 1 37 42 2 3 7 0.14 170 0 0 2 9 27 9 57 40.2 2 253 -52 2 9 0 2 9 54 1 56 45 2 22 9 0.17 171 0 0 2 28 20 9 57 40.3 1 253 -53 2 27 53 2 28 47 2 15 38 2 41 1 0.29 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 365-112309 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 51 24.8954 DE: -17 11 26.644 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 51 24.8954 DE: -17 11 26.644 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.5 * B mag [mag]: 14.7 * Diameter [mas]: 0.10 * 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]: 0.66980 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): 0.105", 0.026", 62.618° remarks: * orbital elements for (175114)2004 QQ : Mean anomaly = 5.2056661748 deg Arg. of pericenter = 31.4887527364 deg Long. of node = 288.0797576111 deg Inclination = 5.7189553716 deg Eccentricity = 0.6632842895 Semimajor axis = 2.2497630031 AU Perihelion dist = 0.7575305480 AU Mag: H = 16.64, G = 0.15 Epoch of elements : MJD 60610.41272900 TDT (2024 Oct 27.4127) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Mar01,0.05,2024,10,27,9.905495,0.009275,-0.076795,17.763218,2.255692,-0.004174,-0.000284,0.000001,0.000000 83.3747,-17.1975,27.38,-13.01,False UCAC4 365-112309,17.85691551,-17.1907344,14.73,13.48,12.81,0.1,0,,17.88067366,-17.1975234,4.78,5.00,0,0,0 175114,2004 QQ,18.25,1.581,0.6698,0,0,16.282,29.67,,0.2,0 0,5.0851,2024,10,27,31.4888,288.0798,5.7190,0.66328,2.24976,0.75753,16.64,5.0,0.15 14.582,0.1047,0.0260,63,0.0435,Known errors,0.87,0,-1,-1 20241027_112309,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org