| 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 |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
00:05:22.60 |
+46:51:32.2 |
HIP 485 |
14.34 |
| 2026-09-20 12:00 |
00:05:21.09 |
+46:51:28.2 |
HIP 485 |
14.48 |
| 2026-09-21 00:00 |
00:05:19.58 |
+46:51:24.1 |
HIP 485 |
14.63 |
| 2026-09-21 12:00 |
00:05:18.06 |
+46:51:19.9 |
HIP 485 |
14.78 |
| 2026-09-22 00:00 |
00:05:16.55 |
+46:51:15.6 |
HIP 485 |
14.94 |
| 2026-09-22 12:00 |
00:05:15.03 |
+46:51:11.1 |
HIP 485 |
15.10 |
| 2026-09-23 00:00 |
00:05:13.52 |
+46:51:06.6 |
HIP 485 |
15.27 |
| 2026-09-23 12:00 |
00:05:12.01 |
+46:51:01.9 |
HIP 485 |
15.44 |
| 2026-09-24 00:00 |
00:05:10.49 |
+46:50:57.2 |
HIP 485 |
15.62 |
| 2026-09-24 12:00 |
00:05:08.97 |
+46:50:52.3 |
HIP 485 |
15.80 |
| 2026-09-25 00:00 |
00:05:07.46 |
+46:50:47.3 |
HIP 485 |
15.98 |
| 2026-09-25 12:00 |
00:05:05.94 |
+46:50:42.2 |
HIP 485 |
16.17 |
| 2026-09-26 00:00 |
00:05:04.43 |
+46:50:37.0 |
HIP 485 |
16.36 |
| 2026-09-26 12:00 |
00:05:02.91 |
+46:50:31.7 |
HIP 485 |
16.56 |
| 2026-09-27 00:00 |
00:05:01.40 |
+46:50:26.3 |
HIP 485 |
16.76 |
| 2026-09-27 12:00 |
00:04:59.89 |
+46:50:20.8 |
HIP 485 |
16.96 |
| 2026-09-28 00:00 |
00:04:58.37 |
+46:50:15.2 |
HIP 485 |
17.17 |
| 2026-09-28 12:00 |
00:04:56.86 |
+46:50:09.4 |
HIP 485 |
17.38 |
| 2026-09-29 00:00 |
00:04:55.35 |
+46:50:03.6 |
HIP 485 |
17.59 |
| 2026-09-29 12:00 |
00:04:53.84 |
+46:49:57.7 |
HIP 485 |
17.81 |
| 2026-09-30 00:00 |
00:04:52.33 |
+46:49:51.6 |
HIP 485 |
18.03 |
| 2026-09-30 12:00 |
00:04:50.82 |
+46:49:45.5 |
HIP 485 |
18.25 |
| 2026-10-01 00:00 |
00:04:49.32 |
+46:49:39.2 |
HIP 485 |
18.47 |
| 2026-10-01 12:00 |
00:04:47.81 |
+46:49:32.9 |
HIP 485 |
18.70 |
| 2026-10-02 00:00 |
00:04:46.31 |
+46:49:26.4 |
HIP 485 |
18.93 |
| 2026-10-02 12:00 |
00:04:44.81 |
+46:49:19.8 |
HIP 485 |
19.17 |
| 2026-10-03 00:00 |
00:04:43.31 |
+46:49:13.2 |
HIP 485 |
19.40 |
| 2026-10-03 12:00 |
00:04:41.81 |
+46:49:06.4 |
HIP 485 |
19.64 |
| 2026-10-04 00:00 |
00:04:40.31 |
+46:48:59.6 |
HIP 485 |
19.88 |
| 2026-10-04 12:00 |
00:04:38.82 |
+46:48:52.6 |
HIP 485 |
20.12 |
| 2026-10-05 00:00 |
00:04:37.32 |
+46:48:45.5 |
HIP 485 |
20.37 |
| 2026-10-05 12:00 |
00:04:35.83 |
+46:48:38.4 |
HIP 485 |
20.61 |
| 2026-10-06 00:00 |
00:04:34.35 |
+46:48:31.1 |
HIP 485 |
20.86 |
| 2026-10-06 12:00 |
00:04:32.86 |
+46:48:23.7 |
HIP 485 |
21.11 |
| 2026-10-07 00:00 |
00:04:31.38 |
+46:48:16.3 |
HIP 485 |
21.37 |
| 2026-10-07 12:00 |
00:04:29.90 |
+46:48:08.7 |
HIP 485 |
21.62 |
| 2026-10-08 00:00 |
00:04:28.43 |
+46:48:01.0 |
HIP 485 |
21.88 |
| 2026-10-08 12:00 |
00:04:26.95 |
+46:47:53.3 |
HIP 485 |
22.13 |
| 2026-10-09 00:00 |
00:04:25.49 |
+46:47:45.4 |
HIP 485 |
22.39 |
| 2026-10-09 12:00 |
00:04:24.02 |
+46:47:37.5 |
HIP 485 |
22.65 |
| 2026-10-10 00:00 |
00:04:22.56 |
+46:47:29.4 |
HIP 485 |
22.91 |
| 2026-10-10 12:00 |
00:04:21.10 |
+46:47:21.3 |
HIP 485 |
23.18 |
| 2026-10-11 00:00 |
00:04:19.64 |
+46:47:13.0 |
HIP 485 |
23.44 |