IOTA/IOTA-ES occultation update for (8710) Hawley / UCAC4 334-194325 event on 2024 Mar 08, 07:42 UT Visible from Summary ------- On 2024 Mar 08 UT, the 11.673 km diameter asteroid (8710) Hawley will occult a 11.9 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 6.86 mag to 18.77 mag (the magnitude of the asteroid) for at most 0.370 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 Mar 08, 07:38 - 2024 Mar 08, 07:45 * geocentric midpoint of event [JD]: 2460377.82094237 * magnitude of target star: 11.91 * magnitude drop [mag]: 6.86 * estimated maximum duration [s]: 0.370 * Moon: 6 % sunlit, 36° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 100°) * approx speed of asteroid's shadow [km/s]: 31.4391 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 334-194325 by 8710 Hawley on 2024 Mar 8 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 - 89 0 0 - 7 46 23 7 38 51.3 0 114 -64 - 7 49 56 - 7 42 51 - 7 52 22 - 7 40 25 .... - 88 0 0 - 8 12 33 7 38 51.3 1 113 -63 - 8 16 6 - 8 9 1 - 8 18 32 - 8 6 35 0.24 - 87 0 0 - 8 38 49 7 38 51.5 2 113 -62 - 8 42 23 - 8 35 17 - 8 44 48 - 8 32 51 0.24 - 86 0 0 - 9 5 11 7 38 51.7 3 113 -61 - 9 8 44 - 9 1 38 - 9 11 10 - 8 59 12 0.23 - 85 0 0 - 9 31 37 7 38 51.9 5 113 -60 - 9 35 10 - 9 28 4 - 9 37 37 - 9 25 38 0.23 - 84 0 0 - 9 58 7 7 38 52.3 6 113 -58 -10 1 41 - 9 54 34 -10 4 7 - 9 52 8 0.23 - 83 0 0 -10 24 41 7 38 52.7 7 113 -57 -10 28 15 -10 21 8 -10 30 41 -10 18 41 0.23 - 82 0 0 -10 51 17 7 38 53.2 8 112 -56 -10 54 51 -10 47 44 -10 57 17 -10 45 18 0.23 - 81 0 0 -11 17 56 7 38 53.8 9 112 -55 -11 21 29 -11 14 22 -11 23 56 -11 11 56 0.23 - 80 0 0 -11 44 35 7 38 54.4 10 112 -54 -11 48 9 -11 41 1 -11 50 35 -11 38 35 0.23 - 79 0 0 -12 11 15 7 38 55.1 11 112 -53 -12 14 49 -12 7 41 -12 17 15 -12 5 15 0.23 - 78 0 0 -12 37 55 7 38 55.9 12 112 -52 -12 41 29 -12 34 21 -12 43 55 -12 31 55 0.23 - 77 0 0 -13 4 34 7 38 56.7 13 111 -51 -13 8 8 -13 1 0 -13 10 35 -12 58 34 0.23 - 76 0 0 -13 31 12 7 38 57.7 14 111 -50 -13 34 46 -13 27 38 -13 37 12 -13 25 11 0.23 - 75 0 0 -13 57 47 7 38 58.7 15 111 -49 -14 1 21 -13 54 13 -14 3 48 -13 51 47 0.23 - 74 0 0 -14 24 20 7 38 59.7 16 111 -48 -14 27 54 -14 20 46 -14 30 20 -14 18 19 0.23 - 73 0 0 -14 50 49 7 39 0.8 17 110 -47 -14 54 23 -14 47 15 -14 56 49 -14 44 48 0.23 - 72 0 0 -15 17 13 7 39 2.0 18 110 -46 -15 20 47 -15 13 39 -15 23 14 -15 11 13 0.23 - 71 0 0 -15 43 33 7 39 3.3 20 110 -45 -15 47 7 -15 39 59 -15 49 33 -15 37 33 0.23 - 70 0 0 -16 9 47 7 39 4.6 21 109 -43 -16 13 21 -16 6 14 -16 15 47 -16 3 47 0.23 - 69 0 0 -16 35 55 7 39 6.0 22 109 -42 -16 39 29 -16 32 22 -16 41 55 -16 29 55 0.23 - 68 0 0 -17 1 56 7 39 7.4 23 109 -41 -17 5 30 -16 58 23 -17 7 56 -16 55 57 0.23 - 67 0 0 -17 27 50 7 39 9.0 24 108 -40 -17 31 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53 -17 45 26 -17 33 27 0.28 95 0 0 -17 13 44 7 45 26.7 4 247 59 -17 17 18 -17 10 11 -17 19 44 -17 7 45 0.29 96 0 0 -16 47 55 7 45 27.0 3 247 58 -16 51 28 -16 44 21 -16 53 54 -16 41 55 0.31 97 0 0 -16 21 58 7 45 27.2 2 246 58 -16 25 31 -16 18 24 -16 27 57 -16 15 58 0.34 98 0 0 -15 55 54 7 45 27.3 1 246 57 -15 59 28 -15 52 21 -16 1 54 -15 49 54 0.43 99 0 0 -15 29 45 7 45 27.3 0 246 56 -15 33 19 -15 26 11 -15 35 45 -15 23 45 1.25 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 334-194325 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 59 57.5453 DE: -23 21 37.371 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 59 57.5453 DE: -23 21 37.371 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8710) Hawley asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.56600 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 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): 0.014", 0.002", 99.8° remarks: * orbital elements for (8710)Hawley : Mean anomaly = 37.3447498211 deg Arg. of pericenter = 132.4298955020 deg Long. of node = 78.4139011799 deg Inclination = 15.1442537928 deg Eccentricity = 0.1582277113 Semimajor axis = 2.6122573448 AU Perihelion dist = 2.1989258439 AU Mag: H = 13.82, G = 0.15 Epoch of elements : MJD 60377.32094216 TDT (2024 Mar 08.3209) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432023Apr25,0.37,2024,3,8,7.702617,-0.015314,-0.215994,17.697952,-1.293101,-0.005058,-0.000560,-0.000001,0.000000 3.3064,-23.3280,67.13,-4.65,False UCAC4 334-194325,18.99931808,-23.3603810,12.58,11.91,11.55,0.0,0,,19.02346334,-23.3279570,6.86,6.78,0,0,0 8710,Hawley,18.77,11.673,2.5660,0,0,4.404,-4.43,,1.0,0 0,37.2698,2024,3,8,132.4299,78.4139,15.1443,0.15823,2.61226,2.19893,13.82,5.0,0.15 1.342,0.0143,0.0017,100,0.0022,Known errors,1.00,0,-1,-1 20240308_194325,60139.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org