IOTA/IOTA-ES occultation update for (1086) Nata / TYC 6892-00361-1 event on 2022 Jul 31, 11:22 UT Visible from Australia Summary ------- On 2022 Jul 31 UT, the 70.1 km diameter asteroid (1086) Nata will occult a 9.5 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.89 mag to 14.33 mag (the magnitude of the asteroid) for at most 5.220 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: 99 * date and approx. time of event: 2022 Jul 31, 11:14 - 2022 Jul 31, 11:31 * geocentric midpoint of event [JD]: 2459791.97431266 * magnitude of target star: 9.45 * magnitude drop [mag]: 4.89 * estimated maximum duration [s]: 5.220 * Moon: 7 % sunlit, 139° distance * Sun: 170° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.006", 68°) * approx speed of asteroid's shadow [km/s]: 13.4293 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6892-00361-1 by 1086 Nata on 2022 Jul 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 87 0 0 - 8 43 9 11 30 51.5 1 113 8 - 8 22 20 - 9 3 58 - 8 14 34 - 9 11 45 .... 88 0 0 - 9 8 32 11 30 51.2 2 113 7 - 8 47 44 - 9 29 21 - 8 39 58 - 9 37 8 0.16 89 0 0 - 9 33 52 11 30 50.8 3 113 6 - 9 13 4 - 9 54 41 - 9 5 18 -10 2 28 0.14 90 0 0 - 9 59 7 11 30 50.3 4 112 5 - 9 38 20 -10 19 55 - 9 30 34 -10 27 42 0.14 91 0 0 -10 24 17 11 30 49.6 5 112 4 -10 3 30 -10 45 4 - 9 55 44 -10 52 51 0.13 92 0 0 -10 49 20 11 30 48.7 6 112 3 -10 28 34 -11 10 8 -10 20 48 -11 17 54 0.13 93 0 0 -11 14 18 11 30 47.6 7 112 2 -10 53 32 -11 35 4 -10 45 47 -11 42 51 0.13 94 0 0 -11 39 8 11 30 46.4 8 112 1 -11 18 23 -11 59 54 -11 10 38 -12 7 40 0.13 95 0 0 -12 3 51 11 30 45.0 9 112 0 -11 43 6 -12 24 36 -11 35 21 -12 32 22 0.13 96 0 0 -12 28 25 11 30 43.5 10 111 -1 -12 7 42 -12 49 10 -11 59 57 -12 56 55 0.13 97 0 0 -12 52 51 11 30 41.8 12 111 -2 -12 32 8 -13 13 35 -12 24 24 -13 21 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- 9 42 26 -10 39 32 0.14 - 94 0 0 - 9 45 52 11 15 18.2 11 248 -19 - 9 25 5 -10 6 40 - 9 17 20 -10 14 27 0.14 - 93 0 0 - 9 20 42 11 15 16.6 10 248 -18 - 8 59 55 - 9 41 30 - 8 52 9 - 9 49 16 0.14 - 92 0 0 - 8 55 27 11 15 15.2 9 248 -17 - 8 34 39 - 9 16 15 - 8 26 53 - 9 24 2 0.14 - 91 0 0 - 8 30 8 11 15 13.9 7 248 -16 - 8 9 21 - 8 50 57 - 8 1 35 - 8 58 44 0.15 - 90 0 0 - 8 4 47 11 15 12.8 6 248 -15 - 7 43 59 - 8 25 35 - 7 36 13 - 8 33 22 0.15 - 89 0 0 - 7 39 22 11 15 11.9 5 248 -14 - 7 18 35 - 8 0 11 - 7 10 48 - 8 7 58 0.16 - 88 0 0 - 7 13 56 11 15 11.2 4 247 -12 - 6 53 9 - 7 34 45 - 6 45 22 - 7 42 32 0.17 - 87 0 0 - 6 48 29 11 15 10.6 3 247 -11 - 6 27 41 - 7 9 18 - 6 19 55 - 7 17 5 0.18 - 86 0 0 - 6 23 1 11 15 10.2 2 247 -10 - 6 2 13 - 6 43 50 - 5 54 27 - 6 51 37 0.21 - 85 0 0 - 5 57 33 11 15 9.9 1 247 -9 - 5 36 46 - 6 18 22 - 5 29 0 - 6 26 9 0.32 Uncertainty in time = +/- 2 secs Prediction of 2022 Jun 13.9 Data for the target star ------------------------ * name: TYC 6892-00361-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 04 33.3177 DE: -22 53 35.161 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 04 33.3177 DE: -22 53 35.161 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1086) Nata asteroid class: approx. diameter [km]: 70 approx. diameter ["]: 0.042 distance from Earth [AU]: 2.32220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2022 Jun 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): 0.016", 0.006", 68.485° remarks: * orbital elements for (1086)Nata : Mean anomaly = 191.8492013326 deg Arg. of pericenter = 157.3494127541 deg Long. of node = 313.2186774848 deg Inclination = 8.3594092006 deg Eccentricity = 0.0535339009 Semimajor axis = 3.1611261471 AU Perihelion dist = 2.9918987334 AU Mag: H = 9.65, G = 0.15 Epoch of elements : MJD 59791.47416667 TDT (2022 Jul 31.4742) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482022Jun09,5.22,2022,7,31,11.383504,0.003583,-0.130558,-7.577216,-0.200635,0.000883,0.000434,0.000001,0.000000 -178.3425,-22.8288,10.86,18.20,False TYC 6892-00361-1,20.07592159,-22.8931004,0.00,9.45,0.00,0.0,0,,20.09841983,-22.8287704,4.90,0.00,0,0,0 1086,Nata,14.33,70.1,2.3222,0,0,-2.075,-0.76,,4.0 0,191.7660,2022,7,31,157.3494,313.2187,8.3594,0.05353,3.16113,2.99190,9.59,5.0,0.15 1.187,0.0157,0.0060,68,0.0078,Known errors,-1.00,-1,-1,-1 20220731_0361-1,59743.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 13, 20:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org