| Parameter |
Value |
| Designation |
C/2001 K3 (Skiff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-04-22T21:02:11.837760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:09Z |
| Obs used |
331 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-07-19.0000000 |
| e |
0.99893567 |
| q (au) |
3.060125 |
| a (au) |
2875.163026 |
| i (deg) |
52.026577 |
| Ω (om, deg) |
289.850117 |
| ω (w, deg) |
3.452328 |
| M (ma, deg) |
0.000557 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.428 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.428 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.752 |
| k |
0.800 |
| δ90 |
10.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
06:09:21.27 |
+43:42:28.1 |
HIP 29059 |
17.46 |
| 2026-05-12 12:00 |
06:09:24.05 |
+43:42:17.2 |
HIP 29059 |
17.99 |
| 2026-05-13 00:00 |
06:09:26.84 |
+43:42:06.5 |
HIP 29059 |
18.52 |
| 2026-05-13 12:00 |
06:09:29.65 |
+43:41:55.8 |
HIP 29059 |
19.06 |
| 2026-05-14 00:00 |
06:09:32.48 |
+43:41:45.2 |
HIP 29059 |
19.60 |
| 2026-05-14 12:00 |
06:09:35.33 |
+43:41:34.6 |
HIP 29059 |
20.14 |
| 2026-05-15 00:00 |
06:09:38.20 |
+43:41:24.2 |
HIP 29059 |
20.69 |
| 2026-05-15 12:00 |
06:09:41.08 |
+43:41:13.8 |
HIP 29378 |
21.14 |
| 2026-05-16 00:00 |
06:09:43.98 |
+43:41:03.6 |
HIP 29378 |
20.70 |
| 2026-05-16 12:00 |
06:09:46.90 |
+43:40:53.4 |
HIP 29378 |
20.27 |
| 2026-05-17 00:00 |
06:09:49.83 |
+43:40:43.3 |
HIP 29378 |
19.83 |
| 2026-05-17 12:00 |
06:09:52.78 |
+43:40:33.3 |
HIP 29378 |
19.40 |
| 2026-05-18 00:00 |
06:09:55.75 |
+43:40:23.3 |
HIP 29378 |
18.97 |
| 2026-05-18 12:00 |
06:09:58.74 |
+43:40:13.5 |
HIP 29378 |
18.55 |
| 2026-05-19 00:00 |
06:10:01.74 |
+43:40:03.7 |
HIP 29378 |
18.12 |
| 2026-05-19 12:00 |
06:10:04.76 |
+43:39:54.1 |
HIP 29378 |
17.71 |
| 2026-05-20 00:00 |
06:10:07.79 |
+43:39:44.5 |
HIP 29378 |
17.30 |
| 2026-05-20 12:00 |
06:10:10.84 |
+43:39:35.0 |
HIP 29378 |
16.89 |
| 2026-05-21 00:00 |
06:10:13.90 |
+43:39:25.6 |
HIP 29378 |
16.50 |
| 2026-05-21 12:00 |
06:10:16.98 |
+43:39:16.3 |
HIP 29378 |
16.10 |
| 2026-05-22 00:00 |
06:10:20.07 |
+43:39:07.1 |
HIP 29378 |
15.72 |
| 2026-05-22 12:00 |
06:10:23.18 |
+43:38:57.9 |
HIP 29378 |
15.35 |
| 2026-05-23 00:00 |
06:10:26.30 |
+43:38:48.9 |
HIP 29378 |
14.99 |
| 2026-05-23 12:00 |
06:10:29.44 |
+43:38:40.0 |
HIP 29378 |
14.64 |
| 2026-05-24 00:00 |
06:10:32.59 |
+43:38:31.1 |
HIP 29378 |
14.30 |
| 2026-05-24 12:00 |
06:10:35.75 |
+43:38:22.3 |
HIP 29378 |
13.98 |
| 2026-05-25 00:00 |
06:10:38.93 |
+43:38:13.6 |
HIP 29378 |
13.67 |
| 2026-05-25 12:00 |
06:10:42.12 |
+43:38:05.1 |
HIP 29378 |
13.37 |
| 2026-05-26 00:00 |
06:10:45.32 |
+43:37:56.6 |
HIP 29378 |
13.10 |
| 2026-05-26 12:00 |
06:10:48.54 |
+43:37:48.2 |
HIP 29378 |
12.84 |
| 2026-05-27 00:00 |
06:10:51.77 |
+43:37:39.9 |
HIP 29378 |
12.60 |
| 2026-05-27 12:00 |
06:10:55.01 |
+43:37:31.6 |
HIP 29378 |
12.39 |
| 2026-05-28 00:00 |
06:10:58.26 |
+43:37:23.5 |
HIP 29378 |
12.20 |
| 2026-05-28 12:00 |
06:11:01.53 |
+43:37:15.5 |
HIP 29378 |
12.03 |
| 2026-05-29 00:00 |
06:11:04.80 |
+43:37:07.6 |
HIP 29378 |
11.89 |
| 2026-05-29 12:00 |
06:11:08.09 |
+43:36:59.7 |
HIP 29378 |
11.78 |
| 2026-05-30 00:00 |
06:11:11.39 |
+43:36:52.0 |
HIP 29378 |
11.70 |
| 2026-05-30 12:00 |
06:11:14.70 |
+43:36:44.3 |
HIP 29378 |
11.64 |
| 2026-05-31 00:00 |
06:11:18.03 |
+43:36:36.8 |
HIP 29378 |
11.62 |
| 2026-05-31 12:00 |
06:11:21.36 |
+43:36:29.3 |
HIP 29378 |
11.63 |
| 2026-06-01 00:00 |
06:11:24.70 |
+43:36:21.9 |
HIP 29378 |
11.66 |
| 2026-06-01 12:00 |
06:11:28.06 |
+43:36:14.7 |
HIP 29378 |
11.73 |
| 2026-06-02 00:00 |
06:11:31.42 |
+43:36:07.5 |
HIP 29378 |
11.83 |