| Parameter |
Value |
| Designation |
C/1966 P1 (Kilston) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1966-10-28T01:52:48.731520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
208 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
8.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1966-09-09.0000000 |
| e |
0.99948025 |
| q (au) |
2.384769 |
| a (au) |
4588.291435 |
| i (deg) |
40.264536 |
| Ω (om, deg) |
156.051601 |
| ω (w, deg) |
154.485693 |
| M (ma, deg) |
359.999844 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.337 + 3.100\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.337 |
| n |
3.100 |
| gf |
0.885 |
| gb |
-0.500 |
| k |
0.926 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
07:44:41.07 |
-06:06:54.1 |
HIP 37661 |
19.29 |
| 2026-09-20 12:00 |
07:44:41.72 |
-06:07:04.0 |
HIP 37661 |
19.32 |
| 2026-09-21 00:00 |
07:44:42.36 |
-06:07:14.0 |
HIP 37661 |
19.35 |
| 2026-09-21 12:00 |
07:44:42.99 |
-06:07:24.0 |
HIP 37661 |
19.38 |
| 2026-09-22 00:00 |
07:44:43.61 |
-06:07:34.0 |
HIP 37661 |
19.41 |
| 2026-09-22 12:00 |
07:44:44.22 |
-06:07:44.0 |
HIP 37661 |
19.44 |
| 2026-09-23 00:00 |
07:44:44.82 |
-06:07:54.0 |
HIP 37661 |
19.47 |
| 2026-09-23 12:00 |
07:44:45.41 |
-06:08:04.0 |
HIP 37661 |
19.50 |
| 2026-09-24 00:00 |
07:44:45.98 |
-06:08:14.0 |
HIP 37661 |
19.53 |
| 2026-09-24 12:00 |
07:44:46.55 |
-06:08:24.0 |
HIP 37661 |
19.57 |
| 2026-09-25 00:00 |
07:44:47.10 |
-06:08:34.1 |
HIP 37661 |
19.60 |
| 2026-09-25 12:00 |
07:44:47.65 |
-06:08:44.1 |
HIP 37661 |
19.63 |
| 2026-09-26 00:00 |
07:44:48.18 |
-06:08:54.2 |
HIP 37661 |
19.66 |
| 2026-09-26 12:00 |
07:44:48.70 |
-06:09:04.3 |
HIP 37661 |
19.69 |
| 2026-09-27 00:00 |
07:44:49.21 |
-06:09:14.3 |
HIP 37661 |
19.72 |
| 2026-09-27 12:00 |
07:44:49.71 |
-06:09:24.4 |
HIP 37661 |
19.75 |
| 2026-09-28 00:00 |
07:44:50.20 |
-06:09:34.5 |
HIP 37661 |
19.78 |
| 2026-09-28 12:00 |
07:44:50.68 |
-06:09:44.6 |
HIP 37661 |
19.82 |
| 2026-09-29 00:00 |
07:44:51.15 |
-06:09:54.6 |
HIP 37661 |
19.84 |
| 2026-09-29 12:00 |
07:44:51.60 |
-06:10:04.7 |
HIP 37661 |
19.87 |
| 2026-09-30 00:00 |
07:44:52.05 |
-06:10:14.8 |
HIP 37661 |
19.90 |
| 2026-09-30 12:00 |
07:44:52.48 |
-06:10:24.9 |
HIP 37661 |
19.93 |
| 2026-10-01 00:00 |
07:44:52.90 |
-06:10:35.0 |
HIP 37661 |
19.96 |
| 2026-10-01 12:00 |
07:44:53.31 |
-06:10:45.1 |
HIP 37661 |
19.99 |
| 2026-10-02 00:00 |
07:44:53.71 |
-06:10:55.2 |
HIP 37661 |
20.01 |
| 2026-10-02 12:00 |
07:44:54.10 |
-06:11:05.2 |
HIP 37661 |
20.04 |
| 2026-10-03 00:00 |
07:44:54.48 |
-06:11:15.3 |
HIP 37661 |
20.06 |
| 2026-10-03 12:00 |
07:44:54.84 |
-06:11:25.4 |
HIP 37661 |
20.09 |
| 2026-10-04 00:00 |
07:44:55.19 |
-06:11:35.5 |
HIP 37661 |
20.11 |
| 2026-10-04 12:00 |
07:44:55.53 |
-06:11:45.5 |
HIP 37661 |
20.13 |
| 2026-10-05 00:00 |
07:44:55.86 |
-06:11:55.6 |
HIP 37661 |
20.15 |
| 2026-10-05 12:00 |
07:44:56.18 |
-06:12:05.6 |
HIP 37661 |
20.17 |
| 2026-10-06 00:00 |
07:44:56.49 |
-06:12:15.7 |
HIP 37661 |
20.19 |
| 2026-10-06 12:00 |
07:44:56.78 |
-06:12:25.7 |
HIP 37661 |
20.21 |
| 2026-10-07 00:00 |
07:44:57.07 |
-06:12:35.7 |
HIP 37661 |
20.23 |
| 2026-10-07 12:00 |
07:44:57.34 |
-06:12:45.8 |
HIP 37661 |
20.24 |
| 2026-10-08 00:00 |
07:44:57.60 |
-06:12:55.8 |
HIP 37661 |
20.26 |
| 2026-10-08 12:00 |
07:44:57.84 |
-06:13:05.8 |
HIP 37661 |
20.27 |
| 2026-10-09 00:00 |
07:44:58.08 |
-06:13:15.7 |
HIP 37661 |
20.28 |
| 2026-10-09 12:00 |
07:44:58.30 |
-06:13:25.7 |
HIP 37661 |
20.29 |
| 2026-10-10 00:00 |
07:44:58.51 |
-06:13:35.7 |
HIP 37661 |
20.30 |
| 2026-10-10 12:00 |
07:44:58.71 |
-06:13:45.6 |
HIP 37661 |
20.31 |
| 2026-10-11 00:00 |
07:44:58.90 |
-06:13:55.5 |
HIP 37661 |
20.32 |