IOTA/IOTA-ES occultation update for (50000) Quaoar / UCAC4 375-128973 event on 2023 May 26, 15:53 UT Visible from New Zealand, Australia Summary ------- On 2023 May 26 UT, the 1110 km diameter asteroid (50000) Quaoar will occult a 14.8 mag star in the constellation Scutum for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.03 mag to 18.81 mag (the magnitude of the asteroid) for at most 55.500 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: 42 * date and approx. time of event: 2023 May 26, 15:47 - 2023 May 26, 15:58 * geocentric midpoint of event [JD]: 2460091.16172167 * magnitude of target star: 14.81 * magnitude drop [mag]: 4.03 * estimated maximum duration [s]: 55.500 * Moon: 41 % sunlit, 132° distance * Sun: 146° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 1290 * 1 sigma uncertainty interval [path widths]: +/- 1.56 * 1 sigma uncertainty interval [seconds]: +/- 144.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.095, +/- 0.056) * 1 sigma uncertainty ellipse (major, minor, PA): (0.096", 0.056", 86°) * approx speed of asteroid's shadow [km/s]: 20.0000 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 375-128973 by 50000 Quaoar #1 on 2023 May 26 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 55 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -34 18 5 .... 56 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -32 25 59 .. .. .. -34 34 37 .... 57 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -32 42 30 .. .. .. -34 51 13 .... 58 0 0 -26 40 55 15 57 26.7 0 107 -34 .. .. .. -32 59 5 .. .. .. -35 7 53 .... 59 0 0 -26 57 21 15 57 26.6 1 106 -35 .. .. .. -33 15 43 .. .. .. -35 24 36 0.48 60 0 0 -27 13 50 15 57 26.4 2 106 -35 -21 19 20 -33 32 24 -19 28 52 -35 41 21 0.52 61 0 0 -27 30 23 15 57 26.1 3 105 -36 -21 35 43 -33 49 8 -19 45 13 -35 58 9 0.54 62 0 0 -27 46 58 15 57 25.7 4 105 -37 -21 52 10 -34 5 54 -20 1 37 -36 14 59 0.55 63 0 0 -28 3 35 15 57 25.2 5 104 -38 -22 8 40 -34 22 41 -20 18 4 -36 31 50 0.56 64 0 0 -28 20 15 15 57 24.6 6 104 -39 -22 25 12 -34 39 30 -20 34 35 -36 48 43 0.56 65 0 0 -28 36 56 15 57 23.9 7 103 -40 -22 41 46 -34 56 20 -20 51 7 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.. .. .. .. .. .. -38 43 0 .. .. .. -40 52 40 .... -100 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -40 36 6 .... Uncertainty in time = +/- 23 secs Prediction of 2023 Mar 30.0 Data for the target star ------------------------ * name: UCAC4 375-128973 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 32 44.9289 DE: -15 03 48.979 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 32 44.9289 DE: -15 03 48.979 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 14.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (50000) Quaoar asteroid class: TNO asteroid system: multiple bodies approx. diameter [km]: 1110 approx. diameter ["]: 0.037 distance from Earth [AU]: 41.87290 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 date of fit: 2022 Aug 09 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): 0.015", 0.006", 86.929° remarks: * orbital elements for (50000)Quaoar : Mean anomaly = 293.7998114915 deg Arg. of pericenter = 158.6235035801 deg Long. of node = 189.0991782480 deg Inclination = 7.9912907446 deg Eccentricity = 0.0399302226 Semimajor axis = 43.3556433623 AU Perihelion dist = 41.6244428710 AU Mag: H = 2.42, G = 0.15 Epoch of elements : MJD 60090.66215278 TDT (2023 May 26.6622) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432022Aug09 Binary solution 1 : Kepler,55.50,2023,5,26,15.881320,-0.029512,-0.509018,-11.270260,0.642714,-0.003141,-0.000891,0.000001,0.000000 156.3441,-15.0470,-58.95,21.16,False UCAC4 375-128973,18.54581358,-15.0636052,0.00,14.81,0.00,0.0,0,,18.56825498,-15.0470292,4.03,0.00,0,1,2 50000,Quaoar #1,18.81,1110.0,41.8729,0,1,-0.163,0.14,,40.0,0 Weywot,81,13800,12.260000,0.1480,14.00,,,348.00,1.00, 0,293.7975,2023,5,26,158.6235,189.0992,7.9913,0.03993,43.35564,41.62444,2.42,5.0,0.15 1.161,0.0153,0.0057,87,0.0059,Known errors + binary orbit,-1.00,-1,-1,-1 20230526_128973_Ma1,60032.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 29, 23:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org