| Parameter |
Value |
| Designation |
C/2001 K5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-10-11T17:47:00.801600Z |
| Orbit solution date (soln_date, UTC) |
2025-08-07T09:12:14Z |
| Obs used |
3292 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
8.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-01-31.0000000 |
| e |
0.99953401 |
| q (au) |
5.184239 |
| a (au) |
11125.172368 |
| i (deg) |
72.590404 |
| Ω (om, deg) |
237.457730 |
| ω (w, deg) |
47.054253 |
| M (ma, deg) |
0.000093 |
Magnitude
Scatter + Global Linear
$$
M_a = (0.479 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.479 |
| n |
6.000 |
| gf |
0.890 |
| gb |
-0.500 |
| k |
0.937 |
| δ90 |
3.269 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2001-04-30 |
2002-10-11 |
+9.4650 |
-7.250 |
| 2002-10-11 |
2005-01-02 |
+4.3531 |
-3.239 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
03:58:09.48 |
+14:47:13.3 |
HIP 18576 |
19.00 |
| 2026-07-29 12:00 |
03:58:10.78 |
+14:47:10.3 |
HIP 18576 |
18.94 |
| 2026-07-30 00:00 |
03:58:12.05 |
+14:47:07.2 |
HIP 18576 |
18.90 |
| 2026-07-30 12:00 |
03:58:13.30 |
+14:47:04.1 |
HIP 18576 |
18.86 |
| 2026-07-31 00:00 |
03:58:14.53 |
+14:47:00.9 |
HIP 18576 |
18.83 |
| 2026-07-31 12:00 |
03:58:15.74 |
+14:46:57.6 |
HIP 18576 |
18.81 |
| 2026-08-01 00:00 |
03:58:16.93 |
+14:46:54.2 |
HIP 18576 |
18.80 |
| 2026-08-01 12:00 |
03:58:18.10 |
+14:46:50.7 |
HIP 18576 |
18.79 |
| 2026-08-02 00:00 |
03:58:19.24 |
+14:46:47.2 |
HIP 18576 |
18.79 |
| 2026-08-02 12:00 |
03:58:20.37 |
+14:46:43.6 |
HIP 18576 |
18.79 |
| 2026-08-03 00:00 |
03:58:21.47 |
+14:46:39.9 |
HIP 18576 |
18.80 |
| 2026-08-03 12:00 |
03:58:22.55 |
+14:46:36.1 |
HIP 18576 |
18.82 |
| 2026-08-04 00:00 |
03:58:23.61 |
+14:46:32.2 |
HIP 18576 |
18.84 |
| 2026-08-04 12:00 |
03:58:24.65 |
+14:46:28.3 |
HIP 18576 |
18.87 |
| 2026-08-05 00:00 |
03:58:25.67 |
+14:46:24.3 |
HIP 18576 |
18.91 |
| 2026-08-05 12:00 |
03:58:26.66 |
+14:46:20.2 |
HIP 18576 |
18.95 |
| 2026-08-06 00:00 |
03:58:27.64 |
+14:46:16.0 |
HIP 18576 |
18.99 |
| 2026-08-06 12:00 |
03:58:28.59 |
+14:46:11.8 |
HIP 18576 |
19.04 |
| 2026-08-07 00:00 |
03:58:29.51 |
+14:46:07.5 |
HIP 18576 |
19.10 |
| 2026-08-07 12:00 |
03:58:30.42 |
+14:46:03.0 |
HIP 18576 |
19.16 |
| 2026-08-08 00:00 |
03:58:31.30 |
+14:45:58.6 |
HIP 18576 |
19.22 |
| 2026-08-08 12:00 |
03:58:32.16 |
+14:45:54.0 |
HIP 18576 |
19.29 |
| 2026-08-09 00:00 |
03:58:33.00 |
+14:45:49.3 |
HIP 18576 |
19.36 |
| 2026-08-09 12:00 |
03:58:33.82 |
+14:45:44.6 |
HIP 18576 |
19.43 |
| 2026-08-10 00:00 |
03:58:34.61 |
+14:45:39.8 |
HIP 18576 |
19.51 |
| 2026-08-10 12:00 |
03:58:35.38 |
+14:45:34.9 |
HIP 18576 |
19.59 |
| 2026-08-11 00:00 |
03:58:36.13 |
+14:45:30.0 |
HIP 18576 |
19.67 |
| 2026-08-11 12:00 |
03:58:36.85 |
+14:45:24.9 |
HIP 18576 |
19.76 |
| 2026-08-12 00:00 |
03:58:37.55 |
+14:45:19.8 |
HIP 18576 |
19.85 |
| 2026-08-12 12:00 |
03:58:38.23 |
+14:45:14.6 |
HIP 18576 |
19.94 |
| 2026-08-13 00:00 |
03:58:38.89 |
+14:45:09.3 |
HIP 18576 |
20.04 |
| 2026-08-13 12:00 |
03:58:39.52 |
+14:45:03.9 |
HIP 18576 |
20.13 |
| 2026-08-14 00:00 |
03:58:40.13 |
+14:44:58.5 |
HIP 18576 |
20.23 |
| 2026-08-14 12:00 |
03:58:40.71 |
+14:44:53.0 |
HIP 18576 |
20.33 |
| 2026-08-15 00:00 |
03:58:41.27 |
+14:44:47.4 |
HIP 18576 |
20.43 |
| 2026-08-15 12:00 |
03:58:41.81 |
+14:44:41.7 |
HIP 18576 |
20.54 |
| 2026-08-16 00:00 |
03:58:42.33 |
+14:44:36.0 |
HIP 18576 |
20.64 |
| 2026-08-16 12:00 |
03:58:42.82 |
+14:44:30.2 |
HIP 18576 |
20.75 |
| 2026-08-17 00:00 |
03:58:43.29 |
+14:44:24.3 |
HIP 18576 |
20.86 |
| 2026-08-17 12:00 |
03:58:43.73 |
+14:44:18.3 |
HIP 18576 |
20.97 |
| 2026-08-18 00:00 |
03:58:44.15 |
+14:44:12.2 |
HIP 18576 |
21.08 |
| 2026-08-18 12:00 |
03:58:44.55 |
+14:44:06.1 |
HIP 18576 |
21.19 |
| 2026-08-19 00:00 |
03:58:44.92 |
+14:43:59.9 |
HIP 18576 |
21.30 |