IOTA/IOTA-ES occultation update for (774) Armor / TYC 6815-00487-1 event on 2023 Mar 18, 16:32 UT Visible from New Zealand, Australia Summary ------- On 2023 Mar 18 UT, the 50.9 km diameter asteroid (774) Armor will occult a 11.9 mag star in the constellation Ophiuchus 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 2.17 mag to 13.94 mag (the magnitude of the asteroid) for at most 3.640 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: 100 * date and approx. time of event: 2023 Mar 18, 16:24 - 2023 Mar 18, 16:39 * geocentric midpoint of event [JD]: 2460022.18903300 * magnitude of target star: 11.93 * magnitude drop [mag]: 2.17 * estimated maximum duration [s]: 3.640 * Moon: 13 % sunlit, 57° distance * Sun: 100° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.031, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.031", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 13.9828 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6815-00487-1 by 774 Armor on 2023 Mar 18 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 96 0 0 -18 46 57 16 25 6.2 0 116 -62 -19 3 29 -18 30 28 -19 5 29 -18 28 28 .... 97 0 0 -19 14 48 16 25 6.3 1 115 -63 -19 31 20 -18 58 18 -19 33 21 -18 56 18 0.36 98 0 0 -19 42 41 16 25 6.7 3 115 -63 -19 59 13 -19 26 10 -20 1 14 -19 24 10 0.38 99 0 0 -20 10 34 16 25 7.1 4 115 -63 -20 27 7 -19 54 3 -20 29 8 -19 52 3 0.38 100 0 0 -20 38 28 16 25 7.8 5 114 -64 -20 55 2 -20 21 56 -20 57 2 -20 19 56 0.39 101 0 0 -21 6 21 16 25 8.6 6 114 -64 -21 22 55 -20 49 48 -21 24 56 -20 47 48 0.39 102 0 0 -21 34 12 16 25 9.6 7 114 -64 -21 50 47 -21 17 39 -21 52 48 -21 15 39 0.39 103 0 0 -22 2 1 16 25 10.7 8 113 -64 -22 18 36 -21 45 28 -22 20 37 -21 43 28 0.39 104 0 0 -22 29 48 16 25 12.0 9 113 -64 -22 46 23 -22 13 15 -22 48 24 -22 11 14 0.39 105 0 0 -22 57 31 16 25 13.4 10 113 -64 -23 14 6 -22 40 57 -23 16 7 -22 38 57 0.39 106 0 0 -23 25 9 16 25 15.0 11 112 -64 -23 41 44 -23 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Uncertainty in time = +/- 4 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 6815-00487-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 04 58.1746 DE: -24 26 45.916 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 04 58.1747 DE: -24 26 45.916 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (774) Armor asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.031 distance from Earth [AU]: 2.28230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#72 date of fit: 2023 Feb 07 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): 0.031", 0.002", 89.57° remarks: * orbital elements for (774)Armor : Mean anomaly = 328.7883591104 deg Arg. of pericenter = 28.7059357447 deg Long. of node = 250.0739635997 deg Inclination = 5.5644664876 deg Eccentricity = 0.1664056995 Semimajor axis = 3.0489516945 AU Perihelion dist = 2.5415887550 AU Mag: H = 8.96, G = 0.15 Epoch of elements : MJD 60021.68916667 TDT (2023 Mar 18.6892) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#722023Feb07,3.64,2023,3,18,16.536792,-0.002468,-0.354774,7.892083,-0.055966,-0.005675,0.000557,0.000000,0.000000 -167.4344,-24.4783,-66.04,-0.87,False TYC 6815-00487-1,17.08282626,-24.4460878,0.00,11.93,0.00,0.0,0,,17.10632005,-24.4782621,2.17,0.00,0,0,0 774,Armor,13.94,50.9,2.2823,0,0,2.228,-0.22,,2.8,0 0,328.6608,2023,3,18,28.7059,250.0740,5.5645,0.16641,3.04895,2.54159,8.98,5.0,0.15 1.061,0.0307,0.0018,90,0.0019,Known errors,-1.00,-1,-1,-1 20230318_0487-1,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org