IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 362-187325 event on 2023 Nov 08, 12:35 UT Visible from W Australia Summary ------- On 2023 Nov 08 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across W Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.23 mag to 10.51 mag (the magnitude of the asteroid) for at most 8.650 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 Nov 08, 12:31 - 2023 Nov 08, 12:38 * geocentric midpoint of event [JD]: 2460257.02450771 * magnitude of target star: 12.09 * magnitude drop [mag]: 0.23 * estimated maximum duration [s]: 8.650 * Moon: 22 % sunlit, 123° distance * Sun: 67° distance * rough path description: W Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 281 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.002", 68°) * approx speed of asteroid's shadow [km/s]: 28.7068 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 362-187325 by 15 Eunomia on 2023 Nov 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 0 0 0 .. .. .... .. .. .. .. .. .. -40 39 43 .. .. .. -40 42 11 .. .. .. .... - 46 0 0 -39 36 7 12 32 1.3 1 112 53 -40 59 21 -38 14 0 -41 1 49 -38 11 37 .... - 45 0 0 -39 55 36 12 32 1.4 2 112 53 -41 18 43 -38 33 37 -41 21 10 -38 31 14 0.48 - 44 0 0 -40 14 49 12 32 1.5 2 111 54 -41 37 48 -38 52 57 -41 40 15 -38 50 34 0.50 - 43 0 0 -40 33 45 12 32 1.7 3 111 54 -41 56 36 -39 12 0 -41 59 3 -39 9 37 0.51 - 42 0 0 -40 52 23 12 32 1.9 4 110 55 -42 15 6 -39 30 47 -42 17 33 -39 28 24 0.51 - 41 0 0 -41 10 45 12 32 2.2 5 109 55 -42 33 20 -39 49 16 -42 35 46 -39 46 54 0.52 - 40 0 0 -41 28 49 12 32 2.5 6 109 55 -42 51 15 -40 7 28 -42 53 41 -40 5 6 0.52 - 39 0 0 -41 46 35 12 32 2.9 6 108 56 -43 8 53 -40 25 22 -43 11 19 -40 23 0 0.52 - 38 0 0 -42 4 3 12 32 3.3 7 107 56 -43 26 13 -40 42 59 -43 28 39 -40 40 37 0.52 - 37 0 0 -42 21 14 12 32 3.8 8 107 57 -43 43 15 -41 0 18 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148 0 0 -14 24 52 12 38 33.8 3 253 -54 -15 46 10 -13 4 37 -15 48 34 -13 2 17 0.67 149 0 0 -14 4 48 12 38 34.0 2 252 -55 -15 25 56 -12 44 42 -15 28 20 -12 42 22 0.74 150 0 0 -13 45 2 12 38 34.1 1 252 -56 -15 6 2 -12 25 6 -15 8 26 -12 22 46 0.98 0 0 0 .. .. .... .. .. .. .. .. .. -14 46 28 .. .. .. -14 48 51 .. .. .. .... Uncertainty in time = +/- 0 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 362-187325 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 33 06.2843 DE: -17 43 22.064 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 33 06.2843 DE: -17 43 22.064 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15) Eunomia asteroid class: ShapeModel approx. diameter [km]: 248 approx. diameter ["]: 0.128 distance from Earth [AU]: 2.66510 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 date of fit: 2023 Oct 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): 0.005", 0.002", 67.849° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 302.9407536551 deg Arg. of pericenter = 98.7755102655 deg Long. of node = 292.9068452015 deg Inclination = 11.7551280010 deg Eccentricity = 0.1871103405 Semimajor axis = 2.6425542918 AU Perihelion dist = 2.1481050585 AU Mag: H = 5.41, G = 0.23 Epoch of elements : MJD 60256.52451389 TDT (2023 Nov 08.5245) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962023Oct09,8.65,2023,11,8,12.588185,0.109672,-0.452447,15.742282,3.836090,0.005194,0.000996,-0.000001,0.000000 57.3508,-17.6725,-12.89,-16.58,False UCAC4 362-187325,19.55174568,-17.7227955,0.00,12.09,0.00,0.0,0,,19.57440870,-17.6724850,0.23,0.00,0,0,0 15,Eunomia,10.51,248.300,2.6651,0,0,3.635,12.66,,14.4,0 0,302.8204,2023,11,8,98.7755,292.9068,11.7551,0.18711,2.64255,2.14811,5.38,5.0,0.15 1.015,0.0047,0.0018,68,0.0050,Known errors,-1.00,0,-1,-1 20231108_187325,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org