IOTA/IOTA-ES occultation update for (15) Eunomia / TYC 6871-00362-1 event on 2023 Mar 07, 07:41 UT Visible from South America Summary ------- On 2023 Mar 07 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.78 mag to 11.14 mag (the magnitude of the asteroid) for at most 8.790 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 07, 07:38 - 2023 Mar 07, 07:45 * geocentric midpoint of event [JD]: 2460010.82081838 * magnitude of target star: 11.09 * magnitude drop [mag]: 0.78 * estimated maximum duration [s]: 8.790 * Moon: 100 % sunlit, 116° distance * Sun: 67° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 249 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.008", 74°) * approx speed of asteroid's shadow [km/s]: 28.2529 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6871-00362-1 by 15 Eunomia on 2023 Mar 7 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 - 93 0 0 .. .. .... .. .. .. .. .. .. - 9 26 50 .. .. .. - 9 38 40 .. .. .. .... - 92 0 0 - 8 42 44 7 38 13.5 1 119 -66 -10 0 8 - 7 25 28 -10 11 57 - 7 13 42 .... - 91 0 0 - 9 15 56 7 38 13.6 2 119 -65 -10 33 17 - 7 58 44 -10 45 6 - 7 46 58 0.13 - 90 0 0 - 9 48 59 7 38 13.8 3 119 -64 -11 6 16 - 8 31 51 -11 18 4 - 8 20 5 0.11 - 89 0 0 -10 21 52 7 38 14.1 4 119 -62 -11 39 4 - 9 4 48 -11 50 52 - 8 53 3 0.10 - 88 0 0 -10 54 33 7 38 14.5 5 118 -61 -12 11 41 - 9 37 33 -12 23 27 - 9 25 49 0.10 - 87 0 0 -11 27 2 7 38 15.0 7 118 -60 -12 44 4 -10 10 8 -12 55 50 - 9 58 24 0.09 - 86 0 0 -11 59 18 7 38 15.5 8 118 -59 -13 16 15 -10 42 29 -13 28 0 -10 30 46 0.09 - 85 0 0 -12 31 20 7 38 16.2 9 118 -58 -13 48 11 -11 14 37 -13 59 55 -11 2 55 0.09 - 84 0 0 -13 3 7 7 38 16.9 10 118 -57 -14 19 52 -11 46 30 -14 31 35 -11 34 49 0.08 - 83 0 0 -13 34 38 7 38 17.7 11 117 -56 -14 51 17 -12 18 8 -15 2 59 -12 6 28 0.08 - 82 0 0 -14 5 53 7 38 18.6 12 117 -55 -15 22 25 -12 49 30 -15 34 6 -12 37 52 0.08 - 81 0 0 -14 36 51 7 38 19.5 13 117 -54 -15 53 15 -13 20 36 -16 4 55 -13 8 58 0.08 - 80 0 0 -15 7 32 7 38 20.6 14 117 -52 -16 23 48 -13 51 23 -16 35 27 -13 39 47 0.08 - 79 0 0 -15 37 53 7 38 21.7 15 116 -51 -16 54 1 -14 21 53 -17 5 39 -14 10 18 0.08 - 78 0 0 -16 7 55 7 38 22.9 17 116 -50 -17 23 55 -14 52 3 -17 35 32 -14 40 29 0.08 - 77 0 0 -16 37 38 7 38 24.1 18 116 -49 -17 53 29 -15 21 54 -18 5 4 -15 10 22 0.08 - 76 0 0 -17 6 59 7 38 25.5 19 115 -48 -18 22 42 -15 51 25 -18 34 16 -15 39 54 0.08 - 75 0 0 -17 36 0 7 38 26.9 20 115 -47 -18 51 33 -16 20 34 -19 3 6 -16 9 5 0.08 - 74 0 0 -18 4 39 7 38 28.3 21 115 -46 -19 20 3 -16 49 23 -19 31 34 -16 37 54 0.08 - 73 0 0 -18 32 56 7 38 29.9 22 114 -45 -19 48 10 -17 17 49 -19 59 39 -17 6 22 0.08 - 72 0 0 -19 0 49 7 38 31.5 23 114 -44 -20 15 54 -17 45 52 -20 27 22 -17 34 27 0.08 - 71 0 0 -19 28 20 7 38 33.1 24 114 -43 -20 43 14 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Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 6871-00362-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 42 37.8704 DE: -28 53 14.081 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 42 37.8706 DE: -28 53 14.081 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * 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 ["]: 0.109 distance from Earth [AU]: 3.15110 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#92 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): 0.015", 0.008", 74.272° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 246.5093706666 deg Arg. of pericenter = 98.7164692213 deg Long. of node = 292.9079690953 deg Inclination = 11.7536967501 deg Eccentricity = 0.1870153759 Semimajor axis = 2.6430295208 AU Perihelion dist = 2.1487423616 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60010.32076389 TDT (2023 Mar 07.3208) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#922023Feb07,8.79,2023,3,7,7.699641,0.006272,-0.064948,15.870261,1.559689,-0.005340,-0.000644,-0.000001,0.000000 0.7524,-28.8650,67.28,-5.34,False TYC 6871-00362-1,18.71051953,-28.8872449,0.00,11.09,0.00,0.0,0,,18.73461742,-28.8649882,0.78,0.00,0,0,0 15,Eunomia,11.14,248.3,3.1511,0,0,3.372,4.35,,14.4,0 0,246.4358,2023,3,7,98.7165,292.9080,11.7537,0.18702,2.64303,2.14874,5.38,5.0,0.15 1.076,0.0147,0.0080,74,0.0083,Known errors,-1.00,-1,-1,-1 20230307_0362-1,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org