IOTA/IOTA-ES occultation update for (12894) 1998 QN73 / UCAC4 357-095286 event on 2024 Sep 07, 22:15 UT Visible from Summary ------- On 2024 Sep 07 UT, the 12.1522624739958 km diameter asteroid (12894) 1998 QN73 will occult a 11.2 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.45 mag to 17.67 mag (the magnitude of the asteroid) for at most 0.820 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: 98 * date and approx. time of event: 2024 Sep 07, 22:10 - 2024 Sep 07, 22:21 * geocentric midpoint of event [JD]: 2460561.42752675 * magnitude of target star: 11.22 * magnitude drop [mag]: 6.45 * estimated maximum duration [s]: 0.820 * Moon: 19 % sunlit, 46° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 78°) * approx speed of asteroid's shadow [km/s]: 15.2166 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 357-095286 by 12894 1998 QN73 on 2024 Sep 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 -165 0 0 -42 47 28 22 10 16.9 1 115 41 -42 52 21 -42 42 34 -42 55 44 -42 39 12 .... -164 0 0 -43 8 50 22 10 17.0 1 115 40 -43 13 43 -43 3 56 -43 17 7 -43 0 34 0.73 -163 0 0 -43 30 5 22 10 17.3 2 114 40 -43 34 58 -43 25 11 -43 38 21 -43 21 49 0.77 -162 0 0 -43 51 12 22 10 17.6 3 113 40 -43 56 6 -43 46 19 -43 59 29 -43 42 56 0.79 -161 0 0 -44 12 11 22 10 18.1 4 113 40 -44 17 5 -44 7 18 -44 20 28 -44 3 55 0.81 -160 0 0 -44 33 2 22 10 18.6 5 112 40 -44 37 55 -44 28 9 -44 41 18 -44 24 46 0.81 -159 0 0 -44 53 43 22 10 19.3 5 111 39 -44 58 37 -44 48 50 -45 2 0 -44 45 28 0.82 -158 0 0 -45 14 16 22 10 20.1 6 110 39 -45 19 9 -45 9 23 -45 22 32 -45 6 1 0.82 -157 0 0 -45 34 38 22 10 20.9 7 110 39 -45 39 31 -45 29 45 -45 42 54 -45 26 23 0.82 -156 0 0 -45 54 50 22 10 21.9 8 109 39 -45 59 43 -45 49 57 -46 3 5 -45 46 35 0.83 -155 0 0 -46 14 51 22 10 22.9 8 108 38 -46 19 44 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8 -33 19 33 -33 32 27 -33 16 15 1.05 40 0 0 -33 2 59 22 20 59.9 2 249 -59 -33 7 46 -32 58 12 -33 11 5 -32 54 54 1.15 41 0 0 -32 41 47 22 21 0.1 1 248 -59 -32 46 33 -32 37 0 -32 49 51 -32 33 43 1.47 42 0 0 .. .. .... .. .. .. .. .. .. -32 25 30 .. .. .. -32 28 48 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 357-095286 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 28 06.1424 DE: -18 43 38.339 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 28 06.1423 DE: -18 43 38.339 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 12.6 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12894) 1998 QN73 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.81820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 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): 0.018", 0.003", 78.229° remarks: * orbital elements for (12894)1998 QN73 : Mean anomaly = 341.1021290888 deg Arg. of pericenter = 49.5638119013 deg Long. of node = 269.3799809690 deg Inclination = 10.6576286234 deg Eccentricity = 0.2051756631 Semimajor axis = 2.6885451336 AU Perihelion dist = 2.1369211030 AU Mag: H = 13.46, G = 0.15 Epoch of elements : MJD 60560.92752659 TDT (2024 Sep 07.9275) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Apr25,0.82,2024,9,7,22.260642,0.061693,-0.636159,8.548348,0.831215,0.005323,-0.000330,0.000000,0.000000 -58.9998,-18.7481,-154.48,5.61,False UCAC4 357-095286,17.46837290,-18.7273164,12.55,11.22,10.50,0.2,0,,17.49253387,-18.7481408,6.46,6.72,0,0,0 12894,1998 QN73,17.67,12.416,1.8182,0,0,2.911,4.02,,0.6,0 0,340.8948,2024,9,7,49.5638,269.3800,10.6576,0.20518,2.68855,2.13692,13.46,5.0,0.15 1.345,0.0177,0.0026,78,0.0032,Known errors,0.86,0,-1,-1 20240907_095286,60140.55 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org