IOTA/IOTA-ES occultation update for (322) Phaeo / TYC 1254-00391-1 event on 2022 Feb 05, 01:39 UT Visible from South America Summary ------- On 2022 Feb 05 UT, the 72 km diameter asteroid (322) Phaeo will occult a 10.8 mag star in the constellation Taurus 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 2.99 mag to 13.69 mag (the magnitude of the asteroid) for at most 6.570 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: 2022 Feb 05, 01:30 - 2022 Feb 05, 01:48 * geocentric midpoint of event [JD]: 2459615.56907083 * magnitude of target star: 10.77 * magnitude drop [mag]: 2.99 * estimated maximum duration [s]: 6.570 * Moon: 17 % sunlit, 57° distance * Sun: 106° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.001", 88°) * approx speed of asteroid's shadow [km/s]: 10.9668 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1254-00391-1 by 322 Phaeo on 2022 Feb 5 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 -176 0 0 -27 57 41 1 30 54.7 1 68 65 -28 21 21 -27 34 7 -28 22 36 -27 32 52 .... -175 0 0 -27 37 1 1 30 55.0 2 68 65 -28 0 41 -27 13 27 -28 1 56 -27 12 13 0.31 -174 0 0 -27 16 20 1 30 55.4 3 67 64 -27 40 0 -26 52 46 -27 41 15 -26 51 32 0.38 -173 0 0 -26 55 38 1 30 56.0 4 67 63 -27 19 17 -26 32 4 -27 20 32 -26 30 50 0.42 -172 0 0 -26 34 55 1 30 56.8 5 67 63 -26 58 33 -26 11 22 -26 59 48 -26 10 7 0.44 -171 0 0 -26 14 11 1 30 57.8 6 66 62 -26 37 50 -25 50 39 -26 39 5 -25 49 24 0.45 -170 0 0 -25 53 29 1 30 59.0 7 66 61 -26 17 6 -25 29 57 -26 18 21 -25 28 42 0.46 -169 0 0 -25 32 47 1 31 0.4 8 65 60 -25 56 24 -25 9 15 -25 57 39 -25 8 1 0.47 -168 0 0 -25 12 6 1 31 2.0 9 65 59 -25 35 43 -24 48 36 -25 36 58 -24 47 21 0.48 -167 0 0 -24 51 28 1 31 3.7 10 64 59 -25 15 3 -24 27 58 -25 16 18 -24 26 44 0.48 -166 0 0 -24 30 52 1 31 5.7 11 64 58 -24 54 27 -24 7 23 -24 55 41 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44 -22 0 42 -21 11 30 0.53 - 31 0 0 -21 55 48 1 47 48.1 10 295 -51 -22 19 14 -21 32 28 -22 20 29 -21 31 14 0.54 - 30 0 0 -22 15 41 1 47 50.0 9 294 -51 -22 39 8 -21 52 19 -22 40 22 -21 51 5 0.54 - 29 0 0 -22 35 39 1 47 51.7 8 294 -51 -22 59 7 -22 12 17 -23 0 22 -22 11 3 0.54 - 28 0 0 -22 55 44 1 47 53.2 7 294 -51 -23 19 13 -22 32 20 -23 20 28 -22 31 6 0.54 - 27 0 0 -23 15 54 1 47 54.5 6 293 -51 -23 39 24 -22 52 29 -23 40 39 -22 51 15 0.54 - 26 0 0 -23 36 9 1 47 55.6 5 293 -50 -23 59 40 -23 12 43 -24 0 54 -23 11 29 0.55 - 25 0 0 -23 56 28 1 47 56.5 4 292 -50 -24 19 59 -23 33 1 -24 21 14 -23 31 47 0.55 - 24 0 0 -24 16 50 1 47 57.2 3 292 -50 -24 40 23 -23 53 23 -24 41 38 -23 52 9 0.56 - 23 0 0 -24 37 16 1 47 57.7 2 292 -50 -25 0 50 -24 13 48 -25 2 5 -24 12 34 0.57 - 22 0 0 -24 57 45 1 47 58.0 1 291 -49 -25 21 20 -24 34 16 -25 22 35 -24 33 2 0.61 - 21 0 0 -25 18 16 1 47 58.2 0 291 -49 -25 41 51 -24 54 47 -25 43 6 -24 53 32 0.92 Uncertainty in time = +/- 3 secs Prediction of 2021 Dec 15.0 Data for the target star ------------------------ * name: TYC 1254-00391-1 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 01 09.5830 DE: +18 31 02.477 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 01 09.5827 DE: +18 31 02.477 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (322) Phaeo asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.049 distance from Earth [AU]: 2.02390 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 date of fit: 2021 Nov 10 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): 0.024", 0.001", 88.005° remarks: * orbital elements for (322)Phaeo : Mean anomaly = 51.4051968868 deg Arg. of pericenter = 114.6914097839 deg Long. of node = 252.3207884835 deg Inclination = 8.0460382286 deg Eccentricity = 0.2447998969 Semimajor axis = 2.7824839221 AU Perihelion dist = 2.1013321447 AU Mag: H = 9.11, G = 0.15 Epoch of elements : MJD 59615.06916667 TDT (2022 Feb 05.0692) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592021Nov10,6.57,2022,2,5,1.6577,0.014864,-0.473392,6.187759,0.165926,0.005493,0.001155,0.000000,0.000000 -99.4512,18.5787,158.62,-15.97,False TYC 1254-00391-1,4.01932856,18.5173547,0.00,10.77,0.00,0.0,4,,4.04044979,18.5786822,2.99,0.00,0,0,0 322,Phaeo,13.69,72.0,2.0239,0,0,1.891,0.72,,3.6 0,51.1782,2022,2,4,114.6914,252.3208,8.0460,0.24480,2.78248,2.10133,9.11,5.0,0.15 1.026,0.0243,0.0013,88,0.0013,Known errors,-1.00,-1,-1,-1 20220205_0391-1,59563.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Dec 15, 04:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org