C/1946 P1 (Jones)
| Parameter |
Value |
| Designation |
C/1946 P1 (Jones) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1946-10-26T18:27:48.911040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
11 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1947-03-18.0000000 |
| e |
1.00097842 |
| q (au) |
1.135979 |
| a (au) |
-1161.030280 |
| i (deg) |
56.964881 |
| Ω (om, deg) |
238.335472 |
| ω (w, deg) |
320.410218 |
| M (ma, deg) |
0.003543 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.749 + 4.333\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.749 |
| n |
4.333 |
| gf |
0.996 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
00:02:48.70 |
+46:04:22.0 |
HIP 155 |
14.71 |
| 2026-02-03 12:00 |
00:02:49.77 |
+46:04:16.1 |
HIP 155 |
14.90 |
| 2026-02-04 00:00 |
00:02:50.84 |
+46:04:10.3 |
HIP 155 |
15.09 |
| 2026-02-04 12:00 |
00:02:51.93 |
+46:04:04.6 |
HIP 155 |
15.28 |
| 2026-02-05 00:00 |
00:02:53.03 |
+46:03:59.0 |
HIP 155 |
15.47 |
| 2026-02-05 12:00 |
00:02:54.14 |
+46:03:53.5 |
HIP 155 |
15.66 |
| 2026-02-06 00:00 |
00:02:55.26 |
+46:03:48.1 |
HIP 155 |
15.85 |
| 2026-02-06 12:00 |
00:02:56.38 |
+46:03:42.8 |
HIP 155 |
16.04 |
| 2026-02-07 00:00 |
00:02:57.52 |
+46:03:37.7 |
HIP 155 |
16.23 |
| 2026-02-07 12:00 |
00:02:58.66 |
+46:03:32.6 |
HIP 155 |
16.42 |
| 2026-02-08 00:00 |
00:02:59.81 |
+46:03:27.7 |
HIP 155 |
16.61 |
| 2026-02-08 12:00 |
00:03:00.97 |
+46:03:22.8 |
HIP 155 |
16.81 |
| 2026-02-09 00:00 |
00:03:02.14 |
+46:03:18.1 |
HIP 155 |
17.00 |
| 2026-02-09 12:00 |
00:03:03.32 |
+46:03:13.5 |
HIP 155 |
17.19 |
| 2026-02-10 00:00 |
00:03:04.51 |
+46:03:08.9 |
HIP 155 |
17.38 |
| 2026-02-10 12:00 |
00:03:05.71 |
+46:03:04.5 |
HIP 155 |
17.58 |
| 2026-02-11 00:00 |
00:03:06.91 |
+46:03:00.2 |
HIP 155 |
17.77 |
| 2026-02-11 12:00 |
00:03:08.12 |
+46:02:56.1 |
HIP 155 |
17.96 |
| 2026-02-12 00:00 |
00:03:09.34 |
+46:02:52.0 |
HIP 155 |
18.16 |
| 2026-02-12 12:00 |
00:03:10.57 |
+46:02:48.0 |
HIP 155 |
18.35 |
| 2026-02-13 00:00 |
00:03:11.81 |
+46:02:44.2 |
HIP 155 |
18.54 |
| 2026-02-13 12:00 |
00:03:13.05 |
+46:02:40.4 |
HIP 155 |
18.74 |
| 2026-02-14 00:00 |
00:03:14.30 |
+46:02:36.8 |
HIP 155 |
18.93 |
| 2026-02-14 12:00 |
00:03:15.56 |
+46:02:33.3 |
HIP 155 |
19.13 |
| 2026-02-15 00:00 |
00:03:16.83 |
+46:02:29.9 |
HIP 155 |
19.32 |
| 2026-02-15 12:00 |
00:03:18.10 |
+46:02:26.6 |
HIP 155 |
19.52 |
| 2026-02-16 00:00 |
00:03:19.39 |
+46:02:23.4 |
HIP 155 |
19.71 |
| 2026-02-16 12:00 |
00:03:20.68 |
+46:02:20.4 |
HIP 155 |
19.91 |
| 2026-02-17 00:00 |
00:03:21.97 |
+46:02:17.4 |
HIP 155 |
20.10 |
| 2026-02-17 12:00 |
00:03:23.28 |
+46:02:14.6 |
HIP 155 |
20.30 |
| 2026-02-18 00:00 |
00:03:24.59 |
+46:02:11.9 |
HIP 155 |
20.50 |
| 2026-02-18 12:00 |
00:03:25.91 |
+46:02:09.3 |
HIP 155 |
20.70 |
| 2026-02-19 00:00 |
00:03:27.23 |
+46:02:06.8 |
HIP 155 |
20.89 |
| 2026-02-19 12:00 |
00:03:28.56 |
+46:02:04.4 |
HIP 155 |
21.09 |
| 2026-02-20 00:00 |
00:03:29.90 |
+46:02:02.1 |
HIP 155 |
21.29 |
| 2026-02-20 12:00 |
00:03:31.24 |
+46:02:00.0 |
HIP 155 |
21.49 |
| 2026-02-21 00:00 |
00:03:32.59 |
+46:01:58.0 |
HIP 155 |
21.69 |
| 2026-02-21 12:00 |
00:03:33.95 |
+46:01:56.0 |
HIP 155 |
21.89 |
| 2026-02-22 00:00 |
00:03:35.31 |
+46:01:54.2 |
HIP 155 |
22.08 |
| 2026-02-22 12:00 |
00:03:36.68 |
+46:01:52.5 |
HIP 428 |
21.89 |
| 2026-02-23 00:00 |
00:03:38.06 |
+46:01:51.0 |
HIP 428 |
21.70 |
| 2026-02-23 12:00 |
00:03:39.44 |
+46:01:49.5 |
HIP 428 |
21.51 |
| 2026-02-24 00:00 |
00:03:40.82 |
+46:01:48.2 |
HIP 428 |
21.31 |