| 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) |
| 2026-06-01 00:00 |
07:40:14.14 |
-05:52:20.3 |
HIP 37260 |
20.72 |
| 2026-06-01 12:00 |
07:40:15.18 |
-05:52:15.8 |
HIP 37260 |
20.88 |
| 2026-06-02 00:00 |
07:40:16.23 |
-05:52:11.4 |
HIP 37260 |
21.05 |
| 2026-06-02 12:00 |
07:40:17.29 |
-05:52:07.1 |
HIP 37260 |
21.23 |
| 2026-06-03 00:00 |
07:40:18.36 |
-05:52:02.9 |
HIP 37260 |
21.41 |
| 2026-06-03 12:00 |
07:40:19.43 |
-05:51:58.7 |
HIP 37260 |
21.60 |
| 2026-06-04 00:00 |
07:40:20.51 |
-05:51:54.6 |
HIP 37260 |
21.78 |
| 2026-06-04 12:00 |
07:40:21.59 |
-05:51:50.6 |
HIP 37260 |
21.98 |
| 2026-06-05 00:00 |
07:40:22.69 |
-05:51:46.7 |
HIP 37260 |
22.17 |
| 2026-06-05 12:00 |
07:40:23.79 |
-05:51:42.9 |
HIP 37260 |
22.38 |
| 2026-06-06 00:00 |
07:40:24.90 |
-05:51:39.1 |
HIP 37260 |
22.58 |
| 2026-06-06 12:00 |
07:40:26.01 |
-05:51:35.4 |
HIP 37260 |
22.79 |
| 2026-06-07 00:00 |
07:40:27.14 |
-05:51:31.8 |
HIP 37260 |
23.00 |
| 2026-06-07 12:00 |
07:40:28.27 |
-05:51:28.3 |
HIP 37260 |
23.22 |
| 2026-06-08 00:00 |
07:40:29.40 |
-05:51:24.8 |
HIP 37260 |
23.44 |
| 2026-06-08 12:00 |
07:40:30.55 |
-05:51:21.5 |
HIP 37260 |
23.66 |
| 2026-06-09 00:00 |
07:40:31.70 |
-05:51:18.2 |
HIP 37260 |
23.89 |
| 2026-06-09 12:00 |
07:40:32.85 |
-05:51:15.0 |
HIP 37260 |
24.12 |
| 2026-06-10 00:00 |
07:40:34.02 |
-05:51:11.9 |
HIP 37260 |
24.35 |
| 2026-06-10 12:00 |
07:40:35.18 |
-05:51:08.8 |
HIP 37260 |
24.59 |
| 2026-06-11 00:00 |
07:40:36.36 |
-05:51:05.9 |
HIP 37260 |
24.83 |
| 2026-06-11 12:00 |
07:40:37.54 |
-05:51:03.0 |
HIP 37260 |
25.08 |
| 2026-06-12 00:00 |
07:40:38.73 |
-05:51:00.2 |
HIP 37260 |
25.32 |
| 2026-06-12 12:00 |
07:40:39.93 |
-05:50:57.5 |
HIP 37260 |
25.57 |
| 2026-06-13 00:00 |
07:40:41.13 |
-05:50:54.9 |
HIP 37260 |
25.83 |
| 2026-06-13 12:00 |
07:40:42.34 |
-05:50:52.4 |
HIP 37260 |
26.08 |
| 2026-06-14 00:00 |
07:40:43.55 |
-05:50:49.9 |
HIP 37260 |
26.34 |
| 2026-06-14 12:00 |
07:40:44.77 |
-05:50:47.6 |
HIP 37260 |
26.60 |
| 2026-06-15 00:00 |
07:40:45.99 |
-05:50:45.3 |
HIP 37260 |
26.87 |
| 2026-06-15 12:00 |
07:40:47.22 |
-05:50:43.1 |
HIP 37260 |
27.14 |
| 2026-06-16 00:00 |
07:40:48.46 |
-05:50:41.0 |
HIP 37260 |
27.41 |
| 2026-06-16 12:00 |
07:40:49.70 |
-05:50:38.9 |
HIP 37260 |
27.68 |
| 2026-06-17 00:00 |
07:40:50.95 |
-05:50:37.0 |
HIP 37260 |
27.95 |
| 2026-06-17 12:00 |
07:40:52.20 |
-05:50:35.1 |
HIP 37260 |
28.23 |
| 2026-06-18 00:00 |
07:40:53.46 |
-05:50:33.3 |
HIP 37260 |
28.51 |
| 2026-06-18 12:00 |
07:40:54.72 |
-05:50:31.6 |
HIP 37260 |
28.79 |
| 2026-06-19 00:00 |
07:40:55.98 |
-05:50:30.0 |
HIP 37260 |
29.08 |
| 2026-06-19 12:00 |
07:40:57.26 |
-05:50:28.5 |
HIP 37260 |
29.37 |
| 2026-06-20 00:00 |
07:40:58.53 |
-05:50:27.1 |
HIP 37260 |
29.66 |
| 2026-06-20 12:00 |
07:40:59.82 |
-05:50:25.7 |
HIP 37260 |
29.95 |
| 2026-06-21 00:00 |
07:41:01.10 |
-05:50:24.4 |
HIP 37332 |
30.18 |
| 2026-06-21 12:00 |
07:41:02.39 |
-05:50:23.2 |
HIP 37332 |
30.38 |
| 2026-06-22 00:00 |
07:41:03.69 |
-05:50:22.1 |
HIP 37332 |
30.59 |