JPL/HORIZONS 41P/Tuttle-Giacobini-Kresak 2017-Mar-06 10:52:44 Rec #: (+COV) Soln.date: 2017-Jan-19_13:48:03 # obs: 571 ( )

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JPL/HORIZONS 41P/Tuttle-Giacobini-Kresak 2017-Mar-06 10:52:44 Rec #:900480 (+COV) Soln.date: 2017-Jan-19_13:48:03 # obs: 571 (2006-2017) Date UT RA (J2000) DEC (J2000) T-Mag N-Mag Distance Vel Cnst 2017-Mar-13 0:00 10 12 16 42 17 34 10.79 14.84 25.63-5.58 UMa 2017-Mar-13 4:00 10 12 53 42 31 27 10.78 14.84 25.55-5.36 UMa 2017-Mar-13 8:00 10 13 29 42 44 57 10.77 14.84 25.47-5.06 UMa 2017-Mar-13 12:00 10 14 8 42 58 7 10.75 14.84 25.40-4.92 UMa 2017-Mar-13 16:00 10 14 51 43 11 25 10.74 14.84 25.33-5.05 UMa 2017-Mar-13 20:00 10 15 36 43 25 10 10.73 14.83 25.26-5.26 UMa 2017-Mar-14 0:00 10 16 20 43 39 19 10.72 14.83 25.18-5.31 UMa 2017-Mar-14 4:00 10 17 0 43 53 25 10.70 14.83 25.11-5.09 UMa 2017-Mar-14 8:00 10 17 40 44 7 7 10.69 14.83 25.03-4.79 UMa 2017-Mar-14 12:00 10 18 23 44 20 28 10.68 14.83 24.97-4.66 UMa 2017-Mar-14 16:00 10 19 10 44 33 56 10.66 14.83 24.90-4.78 UMa 2017-Mar-14 20:00 10 19 59 44 47 52 10.65 14.83 24.83-4.99 UMa 2017-Mar-15 0:00 10 20 47 45 2 13 10.64 14.83 24.76-5.03 UMa 2017-Mar-15 4:00 10 21 32 45 16 30 10.62 14.83 24.69-4.82 UMa 2017-Mar-15 8:00 10 22 15 45 30 22 10.61 14.83 24.62-4.53 UMa 2017-Mar-15 12:00 10 23 3 45 43 52 10.60 14.83 24.55-4.40 UMa 2017-Mar-15 16:00 10 23 54 45 57 28 10.59 14.83 24.49-4.51 UMa 2017-Mar-15 20:00 10 24 48 46 11 33 10.58 14.83 24.42-4.72 UMa 2017-Mar-16 0:00 10 25 41 46 26 3 10.56 14.83 24.35-4.76 UMa 2017-Mar-16 4:00 10 26 30 46 40 29 10.55 14.83 24.29-4.55 UMa 2017-Mar-16 8:00 10 27 18 46 54 28 10.54 14.83 24.22-4.26 UMa 2017-Mar-16 12:00 10 28 10 47 8 3 10.53 14.83 24.16-4.13 UMa 2017-Mar-16 16:00 10 29 7 47 21 45 10.51 14.83 24.10-4.24 UMa 2017-Mar-16 20:00 10 30 6 47 35 56 10.50 14.83 24.04-4.44 UMa 2017-Mar-17 0:00 10 31 3 47 50 33 10.49 14.83 23.98-4.47 UMa 2017-Mar-17 4:00 10 31 57 48 5 5 10.48 14.83 23.91-4.27 UMa 2017-Mar-17 8:00 10 32 51 48 19 8 10.47 14.83 23.85-3.99 UMa 2017-Mar-17 12:00 10 33 48 48 32 47 10.46 14.83 23.80-3.86 UMa 2017-Mar-17 16:00 10 34 50 48 46 30 10.44 14.83 23.74-3.97 UMa 2017-Mar-17 20:00 10 35 55 49 0 45 10.43 14.83 23.68-4.15 UMa 2017-Mar-18 0:00 10 36 58 49 15 24 10.42 14.83 23.62-4.19 UMa 2017-Mar-18 4:00 10 37 57 49 29 59 10.41 14.83 23.56-4.00 UMa 2017-Mar-18 8:00 10 38 56 49 44 4 10.40 14.83 23.51-3.72 UMa 2017-Mar-18 12:00 10 39 59 49 57 42 10.39 14.84 23.46-3.59 UMa 2017-Mar-18 16:00 10 41 7 50 11 24 10.38 14.84 23.40-3.69 UMa 2017-Mar-18 20:00 10 42 18 50 25 37 10.36 14.84 23.35-3.87 UMa 2017-Mar-19 0:00 10 43 28 50 40 17 10.35 14.84 23.29-3.91 UMa 2017-Mar-19 4:00 10 44 33 50 54 51 10.34 14.84 23.24-3.72 UMa 2017-Mar-19 8:00 10 45 38 51 8 53 10.33 14.84 23.19-3.45 UMa 2017-Mar-19 12:00 10 46 47 51 22 26 10.32 14.84 23.14-3.32 UMa 2017-Mar-19 16:00 10 48 2 51 36 3 10.31 14.84 23.09-3.41 UMa 2017-Mar-19 20:00 10 49 20 51 50 11 10.30 14.84 23.04-3.58 UMa 2017-Mar-20 0:00 10 50 36 52 4 45 10.29 14.84 22.99-3.62 UMa Page 1 of 5

2017-Mar-20 4:00 10 51 49 52 19 14 10.28 14.84 22.94-3.44 UMa 2017-Mar-20 8:00 10 53 0 52 33 9 10.27 14.85 22.89-3.17 UMa 2017-Mar-20 12:00 10 54 16 52 46 34 10.26 14.85 22.84-3.04 UMa 2017-Mar-20 16:00 10 55 38 53 0 0 10.25 14.85 22.80-3.12 UMa 2017-Mar-20 20:00 10 57 3 53 13 58 10.24 14.85 22.75-3.29 UMa 2017-Mar-21 0:00 10 58 27 53 28 22 10.23 14.85 22.71-3.33 UMa 2017-Mar-21 4:00 10 59 47 53 42 40 10.22 14.85 22.66-3.15 UMa 2017-Mar-21 8:00 11 1 6 53 56 23 10.21 14.85 22.62-2.89 UMa 2017-Mar-21 12:00 11 2 30 54 9 34 10.20 14.86 22.58-2.76 UMa 2017-Mar-21 16:00 11 3 59 54 22 45 10.19 14.86 22.54-2.84 UMa 2017-Mar-21 20:00 11 5 33 54 36 26 10.18 14.86 22.49-3.00 UMa 2017-Mar-22 0:00 11 7 5 54 50 35 10.17 14.86 22.45-3.04 UMa 2017-Mar-22 4:00 11 8 33 55 4 37 10.16 14.86 22.41-2.87 UMa 2017-Mar-22 8:00 11 10 0 55 18 2 10.15 14.86 22.37-2.62 UMa 2017-Mar-22 12:00 11 11 32 55 30 53 10.14 14.87 22.33-2.48 UMa 2017-Mar-22 16:00 11 13 10 55 43 42 10.13 14.87 22.29-2.55 UMa 2017-Mar-22 20:00 11 14 52 55 57 1 10.13 14.87 22.26-2.71 UMa 2017-Mar-23 0:00 11 16 33 56 10 48 10.12 14.87 22.22-2.75 UMa 2017-Mar-23 4:00 11 18 10 56 24 27 10.11 14.87 22.18-2.59 UMa 2017-Mar-23 8:00 11 19 46 56 37 28 10.10 14.88 22.14-2.34 UMa 2017-Mar-23 12:00 11 21 26 56 49 52 10.09 14.88 22.11-2.20 UMa 2017-Mar-23 16:00 11 23 14 57 2 13 10.08 14.88 22.08-2.26 UMa 2017-Mar-23 20:00 11 25 6 57 15 3 10.07 14.88 22.04-2.41 UMa 2017-Mar-24 0:00 11 26 56 57 28 20 10.07 14.89 22.01-2.45 UMa 2017-Mar-24 4:00 11 28 43 57 41 30 10.06 14.89 21.98-2.30 UMa 2017-Mar-24 8:00 11 30 28 57 54 0 10.05 14.89 21.94-2.06 UMa 2017-Mar-24 12:00 11 32 18 58 5 50 10.04 14.89 21.92-1.92 UMa 2017-Mar-24 16:00 11 34 15 58 17 35 10.03 14.90 21.89-1.98 UMa 2017-Mar-24 20:00 11 36 17 58 29 47 10.03 14.90 21.86-2.12 UMa 2017-Mar-25 0:00 11 38 18 58 42 27 10.02 14.90 21.83-2.16 UMa 2017-Mar-25 4:00 11 40 15 58 55 0 10.01 14.90 21.80-2.02 UMa 2017-Mar-25 8:00 11 42 10 59 6 51 10.00 14.91 21.77-1.78 UMa 2017-Mar-25 12:00 11 44 10 59 18 0 10.00 14.91 21.75-1.64 UMa 2017-Mar-25 16:00 11 46 18 59 29 0 9.99 14.91 21.72-1.69 UMa 2017-Mar-25 20:00 11 48 30 59 40 27 9.98 14.91 21.70-1.82 UMa 2017-Mar-26 0:00 11 50 42 59 52 21 9.98 14.92 21.67-1.87 UMa 2017-Mar-26 4:00 11 52 49 60 4 8 9.97 14.92 21.64-1.73 UMa 2017-Mar-26 8:00 11 54 55 60 15 12 9.96 14.92 21.62-1.51 UMa 2017-Mar-26 12:00 11 57 5 60 25 31 9.95 14.93 21.60-1.36 UMa 2017-Mar-26 16:00 11 59 23 60 35 39 9.95 14.93 21.58-1.40 UMa 2017-Mar-26 20:00 12 1 47 60 46 11 9.94 14.93 21.56-1.52 UMa 2017-Mar-27 0:00 12 4 10 60 57 10 9.94 14.94 21.54-1.57 UMa 2017-Mar-27 4:00 12 6 28 61 8 3 9.93 14.94 21.51-1.45 UMa 2017-Mar-27 8:00 12 8 44 61 18 11 9.92 14.94 21.49-1.23 UMa 2017-Mar-27 12:00 12 11 5 61 27 31 9.92 14.95 21.48-1.09 UMa 2017-Mar-27 16:00 12 13 34 61 36 37 9.91 14.95 21.46-1.11 UMa Page 2 of 5

2017-Mar-27 20:00 12 16 8 61 46 5 9.91 14.95 21.45-1.23 UMa 2017-Mar-28 0:00 12 18 42 61 56 0 9.90 14.96 21.43-1.28 UMa 2017-Mar-28 4:00 12 21 11 62 5 49 9.89 14.96 21.41-1.17 UMa 2017-Mar-28 8:00 12 23 38 62 14 53 9.89 14.96 21.39-0.96 UMa 2017-Mar-28 12:00 12 26 9 62 23 6 9.88 14.97 21.38-0.81 UMa 2017-Mar-28 16:00 12 28 48 62 31 1 9.88 14.97 21.37-0.82 UMa 2017-Mar-28 20:00 12 31 33 62 39 16 9.87 14.97 21.36-0.94 UMa 2017-Mar-29 0:00 12 34 18 62 47 58 9.87 14.98 21.34-1.00 UMa 2017-Mar-29 4:00 12 36 57 62 56 34 9.86 14.98 21.33-0.89 UMa 2017-Mar-29 8:00 12 39 34 63 4 24 9.86 14.99 21.32-0.69 UMa 2017-Mar-29 12:00 12 42 14 63 11 22 9.85 14.99 21.31-0.53 UMa 2017-Mar-29 16:00 12 45 3 63 17 58 9.85 14.99 21.30-0.54 UMa 2017-Mar-29 20:00 12 47 58 63 24 51 9.84 15.00 21.29-0.65 Dra 2017-Mar-30 0:00 12 50 52 63 32 10 9.84 15.00 21.28-0.71 Dra 2017-Mar-30 4:00 12 53 41 63 39 25 9.83 15.01 21.27-0.62 Dra 2017-Mar-30 8:00 12 56 26 63 45 55 9.83 15.01 21.27-0.42 Dra 2017-Mar-30 12:00 12 59 15 63 51 29 9.83 15.01 21.26-0.26 Dra 2017-Mar-30 16:00 13 2 12 63 56 38 9.82 15.02 21.26-0.26 Dra 2017-Mar-30 20:00 13 5 15 64 2 2 9.82 15.02 21.25-0.37 Dra 2017-Mar-31 0:00 13 8 18 64 7 52 9.81 15.03 21.25-0.43 Dra 2017-Mar-31 4:00 13 11 15 64 13 38 9.81 15.03 21.24-0.35 Dra 2017-Mar-31 8:00 13 14 8 64 18 40 9.81 15.03 21.24-0.16 Dra 2017-Mar-31 12:00 13 17 3 64 22 45 9.80 15.04 21.24 0.00 Dra 2017-Mar-31 16:00 13 20 6 64 26 21 9.80 15.04 21.24 0.02 Dra 2017-Mar-31 20:00 13 23 16 64 30 9 9.80 15.05 21.24-0.08 Dra 2017-Apr-01 0:00 13 26 25 64 34 23 9.79 15.05 21.24-0.16 Dra 2017-Apr-01 4:00 13 29 28 64 38 36 9.79 15.05 21.23-0.08 Dra 2017-Apr-01 8:00 13 32 26 64 42 5 9.79 15.06 21.23 0.10 Dra 2017-Apr-01 12:00 13 35 25 64 44 36 9.78 15.06 21.24 0.27 Dra 2017-Apr-01 16:00 13 38 33 64 46 34 9.78 15.07 21.24 0.29 Dra 2017-Apr-01 20:00 13 41 46 64 48 43 9.78 15.07 21.24 0.19 Dra 2017-Apr-02 0:00 13 44 59 64 51 17 9.78 15.08 21.25 0.12 Dra 2017-Apr-02 4:00 13 48 6 64 53 53 9.77 15.08 21.25 0.18 Dra 2017-Apr-02 8:00 13 51 6 64 55 46 9.77 15.09 21.25 0.36 Dra 2017-Apr-02 12:00 13 54 8 64 56 41 9.77 15.09 21.26 0.52 Dra 2017-Apr-02 16:00 13 57 16 64 57 1 9.77 15.09 21.27 0.56 Dra 2017-Apr-02 20:00 14 0 31 64 57 28 9.77 15.10 21.27 0.46 Dra 2017-Apr-03 0:00 14 3 45 64 58 22 9.76 15.10 21.28 0.38 Dra 2017-Apr-03 4:00 14 6 53 64 59 19 9.76 15.11 21.29 0.43 Dra 2017-Apr-03 8:00 14 9 54 64 59 37 9.76 15.11 21.29 0.60 Dra 2017-Apr-03 12:00 14 12 55 64 58 56 9.76 15.12 21.30 0.78 Dra 2017-Apr-03 16:00 14 16 2 64 57 37 9.76 15.12 21.31 0.82 Dra 2017-Apr-03 20:00 14 19 15 64 56 25 9.76 15.13 21.33 0.73 Dra 2017-Apr-04 0:00 14 22 27 64 55 39 9.75 15.13 21.34 0.64 Dra 2017-Apr-04 4:00 14 25 33 64 54 59 9.75 15.14 21.34 0.68 Dra 2017-Apr-04 8:00 14 28 31 64 53 44 9.75 15.14 21.36 0.85 Dra Page 3 of 5

2017-Apr-04 12:00 14 31 29 64 51 30 9.75 15.15 21.37 1.02 Dra 2017-Apr-04 16:00 14 34 32 64 48 37 9.75 15.15 21.38 1.07 Dra 2017-Apr-04 20:00 14 37 40 64 45 49 9.75 15.16 21.40 0.99 Dra 2017-Apr-05 0:00 14 40 49 64 43 27 9.75 15.16 21.41 0.89 Dra TIME Prior to 1962, times are UT1. Dates thereafter are UTC. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system. Time tags refer to the same instant throughout the solar system, regardless of where the observer is located. For example, if an observation from the surface of another body has an output time-tag of 12:31:00 UTC, an Earth-based time-scale, it refers to the instant on that body simultaneous to 12:31:00 UTC on Earth. The Barycentric Dynamical Time scale (TDB) is used internally as defined by the planetary equations of motion. Conversion between TDB and the selected non-uniform UT output time-scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used as a constant over future intervals. NOTE: "n.a." in output means quantity "not available" at the print-time. SOLAR PRESENCE (OBSERVING SITE) Time tag is followed by a blank, then a solar-presence symbol: '*' Daylight (refracted solar upper-limb on or above apparent horizon) 'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE (OBSERVING SITE) The solar-presence symbol is immediately followed by a lunar-presence symbol: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric ephemeris R.A._(ICRF/J2000.0)_DEC = J2000.0 astrometric right ascension and declination of target center. Adjusted for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f) T-mag N-mag = Page 4 of 5

Comet's approximate apparent visual total magnitude ("T-mag") and nuclear magnitude ("N-mag") by following standard IAU definitions: T-mag = M1 + 5*log10(delta) + k1*log10(r) N-mag = M2 + 5*log10(delta) + k2*log10(r) + phcof*beta Units: MAGNITUDES Ang-diam = The equatorial angular width of the target body full disk, if it were fully visible to the observer. Units: ARCSECONDS delta deldot = Range ("delta") and range-rate ("delta-dot") of the target center relative to the observer at the instant light seen by the observer at print-time would have left the target center (print-time minus down-leg light-time); the distance traveled by a light ray emanating from the center of the target and recorded by the observer at print-time. "deldot" is a projection of the velocity vector along this ray, the light-time-corrected line-of-sight from the coordinate center, and indicates relative motion. A positive "deldot" means the target center is moving away from the observer (coordinate center). A negative "deldot" means the target center is moving toward the observer. Units: KM and KM/S Cnst = Constellation ID; the 3-letter abbreviation for the name of the constellation containing the target center's astrometric position, as defined by IAU (1930) boundary delineation. See documentation for list of abbreviations. Computations by... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA Information: http://ssd.jpl.nasa.gov/ Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser) telnet ssd.jpl.nasa.gov 6775 (via command-line) Author : Jon.Giorgini@jpl.nasa.gov Page 5 of 5