| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
00:07:51.27 |
+46:27:21.4 |
HIP 767 |
17.09 |
| 2026-06-03 00:00 |
00:07:51.82 |
+46:27:34.3 |
HIP 767 |
17.05 |
| 2026-06-03 12:00 |
00:07:52.36 |
+46:27:47.1 |
HIP 767 |
17.02 |
| 2026-06-04 00:00 |
00:07:52.89 |
+46:28:00.0 |
HIP 767 |
16.99 |
| 2026-06-04 12:00 |
00:07:53.41 |
+46:28:12.9 |
HIP 767 |
16.96 |
| 2026-06-05 00:00 |
00:07:53.92 |
+46:28:25.8 |
HIP 767 |
16.94 |
| 2026-06-05 12:00 |
00:07:54.41 |
+46:28:38.6 |
HIP 767 |
16.93 |
| 2026-06-06 00:00 |
00:07:54.89 |
+46:28:51.5 |
HIP 767 |
16.92 |
| 2026-06-06 12:00 |
00:07:55.36 |
+46:29:04.4 |
HIP 767 |
16.91 |
| 2026-06-07 00:00 |
00:07:55.82 |
+46:29:17.2 |
HIP 767 |
16.91 |
| 2026-06-07 12:00 |
00:07:56.27 |
+46:29:30.1 |
HIP 767 |
16.92 |
| 2026-06-08 00:00 |
00:07:56.70 |
+46:29:42.9 |
HIP 767 |
16.93 |
| 2026-06-08 12:00 |
00:07:57.12 |
+46:29:55.7 |
HIP 767 |
16.94 |
| 2026-06-09 00:00 |
00:07:57.53 |
+46:30:08.5 |
HIP 767 |
16.96 |
| 2026-06-09 12:00 |
00:07:57.93 |
+46:30:21.3 |
HIP 767 |
16.99 |
| 2026-06-10 00:00 |
00:07:58.32 |
+46:30:34.1 |
HIP 591 |
16.93 |
| 2026-06-10 12:00 |
00:07:58.69 |
+46:30:46.9 |
HIP 591 |
16.77 |
| 2026-06-11 00:00 |
00:07:59.05 |
+46:30:59.6 |
HIP 591 |
16.62 |
| 2026-06-11 12:00 |
00:07:59.40 |
+46:31:12.4 |
HIP 591 |
16.46 |
| 2026-06-12 00:00 |
00:07:59.73 |
+46:31:25.1 |
HIP 591 |
16.31 |
| 2026-06-12 12:00 |
00:08:00.06 |
+46:31:37.8 |
HIP 591 |
16.16 |
| 2026-06-13 00:00 |
00:08:00.37 |
+46:31:50.5 |
HIP 591 |
16.00 |
| 2026-06-13 12:00 |
00:08:00.67 |
+46:32:03.2 |
HIP 591 |
15.85 |
| 2026-06-14 00:00 |
00:08:00.95 |
+46:32:15.8 |
HIP 591 |
15.70 |
| 2026-06-14 12:00 |
00:08:01.23 |
+46:32:28.5 |
HIP 591 |
15.55 |
| 2026-06-15 00:00 |
00:08:01.49 |
+46:32:41.1 |
HIP 591 |
15.40 |
| 2026-06-15 12:00 |
00:08:01.74 |
+46:32:53.7 |
HIP 591 |
15.25 |
| 2026-06-16 00:00 |
00:08:01.97 |
+46:33:06.2 |
HIP 591 |
15.10 |
| 2026-06-16 12:00 |
00:08:02.20 |
+46:33:18.8 |
HIP 591 |
14.96 |
| 2026-06-17 00:00 |
00:08:02.41 |
+46:33:31.3 |
HIP 591 |
14.81 |
| 2026-06-17 12:00 |
00:08:02.60 |
+46:33:43.8 |
HIP 591 |
14.66 |
| 2026-06-18 00:00 |
00:08:02.79 |
+46:33:56.2 |
HIP 591 |
14.52 |
| 2026-06-18 12:00 |
00:08:02.96 |
+46:34:08.7 |
HIP 591 |
14.37 |
| 2026-06-19 00:00 |
00:08:03.12 |
+46:34:21.1 |
HIP 591 |
14.23 |
| 2026-06-19 12:00 |
00:08:03.27 |
+46:34:33.4 |
HIP 591 |
14.08 |
| 2026-06-20 00:00 |
00:08:03.40 |
+46:34:45.8 |
HIP 591 |
13.94 |
| 2026-06-20 12:00 |
00:08:03.53 |
+46:34:58.1 |
HIP 591 |
13.80 |
| 2026-06-21 00:00 |
00:08:03.63 |
+46:35:10.3 |
HIP 591 |
13.66 |
| 2026-06-21 12:00 |
00:08:03.73 |
+46:35:22.6 |
HIP 591 |
13.52 |
| 2026-06-22 00:00 |
00:08:03.81 |
+46:35:34.8 |
HIP 591 |
13.37 |