IOTA/IOTA-ES occultation update for (2357) Phereclos / TYC 6274-01496-1 event on 2021 Mar 30, 23:26 UT Visible from Africa Summary ------- On 2021 Mar 30 UT, the 96.8 km diameter asteroid (2357) Phereclos will occult a 11.0 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.67 mag to 16.69 mag (the magnitude of the asteroid) for at most 7.7 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: 2021 Mar 30, 23:17 - 2021 Mar 30, 23:34 * geocentric midpoint of event [JD]: 2459304.47660417 * magnitude of target star: 11.03 * magnitude drop [mag]: 5.67 * estimated maximum duration [s]: 7.7 * Moon: 93 % sunlit, 56° distance * Sun: 93° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 99 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 12.5125 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6274-01496-1 by 2357 Phereclos on 2021 Mar 30 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 3 0 0 -19 16 13 23 17 59.0 0 112 -73 -19 45 6 -18 47 23 -19 52 3 .. .. .. .... 4 0 0 -19 38 48 23 17 59.1 1 111 -73 -20 7 40 -19 10 0 -20 14 37 -19 3 5 0.23 5 0 0 -20 1 12 23 17 59.4 2 111 -73 -20 30 1 -19 32 25 -20 36 58 -19 25 30 0.22 6 0 0 -20 23 23 23 17 59.9 3 111 -73 -20 52 11 -19 54 38 -20 59 7 -19 47 44 0.22 7 0 0 -20 45 22 23 18 0.5 4 110 -73 -21 14 8 -20 16 39 -21 21 4 -20 9 45 0.21 8 0 0 -21 7 8 23 18 1.2 5 110 -73 -21 35 52 -20 38 27 -21 42 48 -20 31 33 0.21 9 0 0 -21 28 40 23 18 2.2 6 110 -73 -21 57 23 -21 0 1 -22 4 18 -20 53 8 0.21 10 0 0 -21 49 59 23 18 3.2 7 109 -72 -22 18 39 -21 21 21 -22 25 33 -21 14 28 0.21 11 0 0 -22 11 3 23 18 4.5 8 109 -72 -22 39 41 -21 42 27 -22 46 35 -21 35 35 0.21 12 0 0 -22 31 52 23 18 5.8 9 108 -72 -23 0 29 -22 3 19 -23 7 22 -21 56 27 0.21 13 0 0 -22 52 27 23 18 7.4 10 108 -71 -23 21 1 -22 23 56 -23 27 54 -22 17 4 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34 23 34 22.6 15 251 72 - 7 26 38 - 6 28 32 - 7 33 39 - 6 21 34 0.23 174 0 0 - 6 32 43 23 34 25.0 14 250 73 - 7 1 47 - 6 3 43 - 7 8 46 - 5 56 45 0.23 175 0 0 - 6 8 0 23 34 27.2 12 250 74 - 6 37 2 - 5 39 1 - 6 44 1 - 5 32 3 0.23 176 0 0 - 5 43 24 23 34 29.2 11 250 75 - 6 12 24 - 5 14 27 - 6 19 23 - 5 7 29 0.23 177 0 0 - 5 18 56 23 34 31.1 10 250 76 - 5 47 55 - 4 50 1 - 5 54 54 - 4 43 4 0.23 178 0 0 - 4 54 38 23 34 32.7 9 250 77 - 5 23 35 - 4 25 44 - 5 30 33 - 4 18 47 0.24 179 0 0 - 4 30 28 23 34 34.2 8 250 78 - 4 59 24 - 4 1 36 - 5 6 22 - 3 54 40 0.24 180 0 0 - 4 6 29 23 34 35.5 7 250 79 - 4 35 22 - 3 37 39 - 4 42 20 - 3 30 43 0.24 -179 0 0 - 3 42 40 23 34 36.6 6 250 80 - 4 11 32 - 3 13 52 - 4 18 29 - 3 6 56 0.25 -178 0 0 - 3 19 2 23 34 37.6 5 250 81 - 3 47 52 - 2 50 16 - 3 54 49 - 2 43 21 0.26 -177 0 0 - 2 55 36 23 34 38.3 4 250 82 - 3 24 24 - 2 26 52 - 3 31 20 - 2 19 58 0.27 -176 0 0 - 2 32 22 23 34 38.9 3 250 83 - 3 1 8 - 2 3 40 - 3 8 3 - 1 56 46 0.30 -175 0 0 - 2 9 21 23 34 39.3 2 250 83 - 2 38 4 - 1 40 41 - 2 44 59 - 1 33 47 0.35 -174 0 0 - 1 46 33 23 34 39.5 1 250 84 - 2 15 14 - 1 17 55 - 2 22 8 - 1 11 2 0.57 Uncertainty in time = +/- 5 secs Prediction of 2021 Mar 17.0 Data for the target star ------------------------ * name: TYC 6274-01496-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 31 51.0183 DE: -20 29 16.754 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 31 51.0184 DE: -20 29 16.754 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2357) Phereclos asteroid class: approx. diameter [km]: 97 approx. diameter ["]: 0.028 distance from Earth [AU]: 4.82900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 date of fit: 2021 Mar 16 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): 0.019", 0.002", 87.702° remarks: * orbital elements for (2357)Phereclos : Mean anomaly = 10.48960955 deg Arg. of pericenter = 75.14608804 deg Long. of node = 179.21612357 deg Inclination = 2.66779469 deg Eccentricity = 0.04704641 Semimajor axis = 5.21797672 AU Perihelion dist = 4.97248964 AU Mag: H = 9.08, G = 0.15 Epoch of elements : MJD 59303.97659722 TDT (2021 Mar 30.9766) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562021Mar16,7.74,2021,3,30,23.4385,0.03035,-0.18884,6.96782,1.15198,-0.00594,-0.00036,0.00000,0.00000 98.1319,-20.4727,-170.51,4.15,False TYC 6274-01496-1,18.53083842,-20.4879872,0.00,11.03,0.00,0.0,0,,18.55158059,-20.4726808 2357,Phereclos,16.69,96.8,4.8290,0,0,0.904,2.10,,6.4 0,10.4089,2021,3,30,75.1461,179.2161,2.6678,0.04705,5.21798,4.97249,9.08,5.0,0.15 1.120,0.0187,0.0024,88,0.0033,Known errors,-1.00,-1,-1,-1 20210330_1496-1,59290.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Mar 17, 01:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org