| 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) |
| 2026-05-12 00:00 |
00:07:16.94 |
+46:18:18.2 |
HIP 767 |
23.09 |
| 2026-05-12 12:00 |
00:07:17.95 |
+46:18:30.3 |
HIP 767 |
22.87 |
| 2026-05-13 00:00 |
00:07:18.96 |
+46:18:42.5 |
HIP 767 |
22.66 |
| 2026-05-13 12:00 |
00:07:19.96 |
+46:18:54.7 |
HIP 767 |
22.45 |
| 2026-05-14 00:00 |
00:07:20.95 |
+46:19:06.9 |
HIP 767 |
22.24 |
| 2026-05-14 12:00 |
00:07:21.92 |
+46:19:19.2 |
HIP 767 |
22.04 |
| 2026-05-15 00:00 |
00:07:22.89 |
+46:19:31.5 |
HIP 767 |
21.84 |
| 2026-05-15 12:00 |
00:07:23.85 |
+46:19:43.8 |
HIP 767 |
21.64 |
| 2026-05-16 00:00 |
00:07:24.80 |
+46:19:56.2 |
HIP 767 |
21.44 |
| 2026-05-16 12:00 |
00:07:25.74 |
+46:20:08.6 |
HIP 767 |
21.25 |
| 2026-05-17 00:00 |
00:07:26.67 |
+46:20:21.0 |
HIP 767 |
21.06 |
| 2026-05-17 12:00 |
00:07:27.59 |
+46:20:33.4 |
HIP 767 |
20.88 |
| 2026-05-18 00:00 |
00:07:28.49 |
+46:20:45.9 |
HIP 767 |
20.70 |
| 2026-05-18 12:00 |
00:07:29.39 |
+46:20:58.4 |
HIP 767 |
20.52 |
| 2026-05-19 00:00 |
00:07:30.28 |
+46:21:10.9 |
HIP 767 |
20.34 |
| 2026-05-19 12:00 |
00:07:31.15 |
+46:21:23.5 |
HIP 767 |
20.17 |
| 2026-05-20 00:00 |
00:07:32.02 |
+46:21:36.1 |
HIP 767 |
20.00 |
| 2026-05-20 12:00 |
00:07:32.88 |
+46:21:48.7 |
HIP 767 |
19.84 |
| 2026-05-21 00:00 |
00:07:33.72 |
+46:22:01.3 |
HIP 767 |
19.68 |
| 2026-05-21 12:00 |
00:07:34.56 |
+46:22:13.9 |
HIP 767 |
19.52 |
| 2026-05-22 00:00 |
00:07:35.38 |
+46:22:26.6 |
HIP 767 |
19.37 |
| 2026-05-22 12:00 |
00:07:36.19 |
+46:22:39.3 |
HIP 767 |
19.22 |
| 2026-05-23 00:00 |
00:07:37.00 |
+46:22:52.0 |
HIP 767 |
19.07 |
| 2026-05-23 12:00 |
00:07:37.79 |
+46:23:04.7 |
HIP 767 |
18.93 |
| 2026-05-24 00:00 |
00:07:38.57 |
+46:23:17.4 |
HIP 767 |
18.80 |
| 2026-05-24 12:00 |
00:07:39.34 |
+46:23:30.2 |
HIP 767 |
18.67 |
| 2026-05-25 00:00 |
00:07:40.10 |
+46:23:42.9 |
HIP 767 |
18.54 |
| 2026-05-25 12:00 |
00:07:40.84 |
+46:23:55.7 |
HIP 767 |
18.41 |
| 2026-05-26 00:00 |
00:07:41.58 |
+46:24:08.5 |
HIP 767 |
18.30 |
| 2026-05-26 12:00 |
00:07:42.31 |
+46:24:21.3 |
HIP 767 |
18.18 |
| 2026-05-27 00:00 |
00:07:43.02 |
+46:24:34.1 |
HIP 767 |
18.07 |
| 2026-05-27 12:00 |
00:07:43.72 |
+46:24:47.0 |
HIP 767 |
17.97 |
| 2026-05-28 00:00 |
00:07:44.41 |
+46:24:59.8 |
HIP 767 |
17.87 |
| 2026-05-28 12:00 |
00:07:45.09 |
+46:25:12.6 |
HIP 767 |
17.77 |
| 2026-05-29 00:00 |
00:07:45.76 |
+46:25:25.5 |
HIP 767 |
17.68 |
| 2026-05-29 12:00 |
00:07:46.42 |
+46:25:38.3 |
HIP 767 |
17.60 |
| 2026-05-30 00:00 |
00:07:47.07 |
+46:25:51.2 |
HIP 767 |
17.52 |
| 2026-05-30 12:00 |
00:07:47.70 |
+46:26:04.1 |
HIP 767 |
17.44 |
| 2026-05-31 00:00 |
00:07:48.32 |
+46:26:17.0 |
HIP 767 |
17.37 |
| 2026-05-31 12:00 |
00:07:48.94 |
+46:26:29.8 |
HIP 767 |
17.30 |
| 2026-06-01 00:00 |
00:07:49.54 |
+46:26:42.7 |
HIP 767 |
17.24 |
| 2026-06-01 12:00 |
00:07:50.13 |
+46:26:55.6 |
HIP 767 |
17.19 |
| 2026-06-02 00:00 |
00:07:50.70 |
+46:27:08.5 |
HIP 767 |
17.14 |