IOTA/IOTA-ES occultation update for (2634) James Bradley / UCAC4 361-195352 event on 2023 Jul 11, 00:51 UT Visible from S Africa, South America Summary ------- On 2023 Jul 11 UT, the 35.8 km diameter asteroid (2634) James Bradley will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across S Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.72 mag to 15.90 mag (the magnitude of the asteroid) for at most 2.590 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: 2023 Jul 11, 00:44 - 2023 Jul 11, 00:59 * geocentric midpoint of event [JD]: 2460136.53601800 * magnitude of target star: 11.19 * magnitude drop [mag]: 4.72 * estimated maximum duration [s]: 2.590 * Moon: 39 % sunlit, 93° distance * Sun: 170° distance * rough path description: S Africa, South America The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.004", 85°) * approx speed of asteroid's shadow [km/s]: 13.8049 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 361-195352 by 2634 James Bradley on 2023 Jul 11 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 -107 0 0 -36 22 26 0 59 2.9 0 112 -10 -36 11 17 -36 33 37 -36 5 28 -36 39 27 .... -106 0 0 -36 42 1 0 59 2.8 1 111 -11 -36 30 53 -36 53 10 -36 25 5 -36 59 0 0.35 -105 0 0 -37 1 15 0 59 2.6 2 111 -12 -36 50 8 -37 12 23 -36 44 21 -37 18 12 0.36 -104 0 0 -37 20 8 0 59 2.2 3 110 -13 -37 9 3 -37 31 14 -37 3 16 -37 37 2 0.36 -103 0 0 -37 38 40 0 59 1.8 4 110 -14 -37 27 36 -37 49 45 -37 21 49 -37 55 32 0.37 -102 0 0 -37 56 50 0 59 1.2 5 109 -14 -37 45 47 -38 7 54 -37 40 2 -38 13 41 0.37 -101 0 0 -38 14 40 0 59 0.6 5 108 -15 -38 3 38 -38 25 42 -37 57 53 -38 31 28 0.37 -100 0 0 -38 32 8 0 58 59.9 6 108 -16 -38 21 7 -38 43 9 -38 15 23 -38 48 54 0.37 - 99 0 0 -38 49 14 0 58 59.0 7 107 -17 -38 38 15 -39 0 14 -38 32 31 -39 5 59 0.37 - 98 0 0 -39 5 59 0 58 58.1 8 106 -18 -38 55 2 -39 16 58 -38 49 19 -39 22 42 0.37 - 97 0 0 -39 22 23 0 58 57.0 9 106 -19 -39 11 27 -39 33 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75 0 0 - 9 23 46 0 45 1.4 17 254 -8 - 9 12 35 - 9 34 58 - 9 6 45 - 9 40 49 0.39 76 0 0 - 8 59 28 0 44 58.9 16 254 -7 - 8 48 18 - 9 10 39 - 8 42 29 - 9 16 30 0.39 77 0 0 - 8 35 25 0 44 56.5 15 254 -6 - 8 24 16 - 8 46 35 - 8 18 28 - 8 52 25 0.39 78 0 0 - 8 11 39 0 44 54.3 14 254 -5 - 8 0 31 - 8 22 47 - 7 54 43 - 8 28 37 0.39 79 0 0 - 7 48 9 0 44 52.2 12 253 -4 - 7 37 2 - 7 59 16 - 7 31 14 - 8 5 5 0.40 80 0 0 - 7 24 56 0 44 50.3 11 253 -3 - 7 13 50 - 7 36 2 - 7 8 3 - 7 41 50 0.40 81 0 0 - 7 2 0 0 44 48.6 10 253 -2 - 6 50 56 - 7 13 5 - 6 45 9 - 7 18 53 0.40 82 0 0 - 6 39 23 0 44 47.0 9 253 -1 - 6 28 20 - 6 50 27 - 6 22 34 - 6 56 14 0.40 83 0 0 - 6 17 4 0 44 45.6 8 253 0 - 6 6 2 - 6 28 7 - 6 0 17 - 6 33 54 0.41 84 0 0 - 5 55 5 0 44 44.4 7 253 1 - 5 44 4 - 6 6 7 - 5 38 20 - 6 11 52 0.42 85 0 0 - 5 33 25 0 44 43.3 6 253 2 - 5 22 26 - 5 44 26 - 5 16 42 - 5 50 11 0.42 86 0 0 - 5 12 6 0 44 42.4 5 253 3 - 5 1 7 - 5 23 5 - 4 55 24 - 5 28 49 0.43 87 0 0 - 4 51 6 0 44 41.7 4 252 4 - 4 40 9 - 5 2 5 - 4 34 26 - 5 7 48 0.45 88 0 0 - 4 30 28 0 44 41.1 3 252 5 - 4 19 32 - 4 41 25 - 4 13 50 - 4 47 8 0.48 89 0 0 - 4 10 11 0 44 40.7 2 252 7 - 3 59 16 - 4 21 7 - 3 53 35 - 4 26 49 0.53 90 0 0 - 3 50 16 0 44 40.5 1 252 8 - 3 39 22 - 4 1 11 - 3 33 41 - 4 6 53 0.71 Uncertainty in time = +/- 2 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 361-195352 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 57 00.6519 DE: -17 52 12.704 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 57 00.6519 DE: -17 52 12.704 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2634) James Bradley asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.019 distance from Earth [AU]: 2.61810 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Apr 24 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", 0.004", 85.17° remarks: * orbital elements for (2634)James Bradley : Mean anomaly = 190.4743508924 deg Arg. of pericenter = 332.1333082083 deg Long. of node = 133.3358274262 deg Inclination = 6.4224137841 deg Eccentricity = 0.0494255409 Semimajor axis = 3.4554879140 AU Perihelion dist = 3.2846985546 AU Mag: H = 10.68, G = 0.15 Epoch of elements : MJD 60136.03583333 TDT (2023 Jul 11.0358) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,2.59,2023,7,11,0.864432,0.105868,-0.341269,-7.442152,-2.308257,-0.000909,-0.000462,0.000001,0.000000 -2.0554,-17.8071,168.40,22.16,False UCAC4 361-195352,19.95018108,-17.8701955,0.00,11.19,0.00,0.0,4,,19.97297282,-17.8070758,4.72,0.00,0,0,0 2634,James Bradley,15.90,35.8,2.6181,0,0,-1.750,-7.75,,2.2,0 0,190.3154,2023,7,10,332.1333,133.3358,6.4224,0.04943,3.45549,3.28470,10.72,5.0,0.15 1.261,0.0157,0.0037,85,0.0049,Known errors,-1.00,-1,-1,-1 20230711_195352,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org