| 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) |
| 2026-03-26 00:00 |
00:05:10.45 |
+46:03:52.5 |
HIP 473 |
15.99 |
| 2026-03-26 12:00 |
00:05:11.98 |
+46:03:57.8 |
HIP 473 |
15.99 |
| 2026-03-27 00:00 |
00:05:13.51 |
+46:04:03.3 |
HIP 473 |
16.00 |
| 2026-03-27 12:00 |
00:05:15.04 |
+46:04:08.9 |
HIP 473 |
16.01 |
| 2026-03-28 00:00 |
00:05:16.57 |
+46:04:14.5 |
HIP 473 |
16.03 |
| 2026-03-28 12:00 |
00:05:18.10 |
+46:04:20.3 |
HIP 473 |
16.06 |
| 2026-03-29 00:00 |
00:05:19.63 |
+46:04:26.1 |
HIP 473 |
16.09 |
| 2026-03-29 12:00 |
00:05:21.16 |
+46:04:32.1 |
HIP 473 |
16.13 |
| 2026-03-30 00:00 |
00:05:22.68 |
+46:04:38.2 |
HIP 473 |
16.18 |
| 2026-03-30 12:00 |
00:05:24.20 |
+46:04:44.3 |
HIP 473 |
16.23 |
| 2026-03-31 00:00 |
00:05:25.72 |
+46:04:50.6 |
HIP 473 |
16.29 |
| 2026-03-31 12:00 |
00:05:27.24 |
+46:04:56.9 |
HIP 473 |
16.36 |
| 2026-04-01 00:00 |
00:05:28.76 |
+46:05:03.3 |
HIP 473 |
16.43 |
| 2026-04-01 12:00 |
00:05:30.27 |
+46:05:09.9 |
HIP 473 |
16.51 |
| 2026-04-02 00:00 |
00:05:31.79 |
+46:05:16.5 |
HIP 473 |
16.59 |
| 2026-04-02 12:00 |
00:05:33.30 |
+46:05:23.2 |
HIP 473 |
16.68 |
| 2026-04-03 00:00 |
00:05:34.80 |
+46:05:30.0 |
HIP 473 |
16.78 |
| 2026-04-03 12:00 |
00:05:36.31 |
+46:05:36.9 |
HIP 473 |
16.88 |
| 2026-04-04 00:00 |
00:05:37.81 |
+46:05:43.9 |
HIP 473 |
16.99 |
| 2026-04-04 12:00 |
00:05:39.31 |
+46:05:51.0 |
HIP 473 |
17.10 |
| 2026-04-05 00:00 |
00:05:40.81 |
+46:05:58.2 |
HIP 473 |
17.22 |
| 2026-04-05 12:00 |
00:05:42.30 |
+46:06:05.5 |
HIP 473 |
17.35 |
| 2026-04-06 00:00 |
00:05:43.79 |
+46:06:12.8 |
HIP 473 |
17.48 |
| 2026-04-06 12:00 |
00:05:45.28 |
+46:06:20.3 |
HIP 473 |
17.61 |
| 2026-04-07 00:00 |
00:05:46.77 |
+46:06:27.8 |
HIP 473 |
17.75 |
| 2026-04-07 12:00 |
00:05:48.25 |
+46:06:35.4 |
HIP 473 |
17.90 |
| 2026-04-08 00:00 |
00:05:49.73 |
+46:06:43.2 |
HIP 473 |
18.05 |
| 2026-04-08 12:00 |
00:05:51.20 |
+46:06:51.0 |
HIP 473 |
18.20 |
| 2026-04-09 00:00 |
00:05:52.67 |
+46:06:58.9 |
HIP 473 |
18.36 |
| 2026-04-09 12:00 |
00:05:54.14 |
+46:07:06.8 |
HIP 473 |
18.52 |
| 2026-04-10 00:00 |
00:05:55.60 |
+46:07:14.9 |
HIP 473 |
18.69 |
| 2026-04-10 12:00 |
00:05:57.06 |
+46:07:23.1 |
HIP 473 |
18.86 |
| 2026-04-11 00:00 |
00:05:58.52 |
+46:07:31.3 |
HIP 473 |
19.04 |
| 2026-04-11 12:00 |
00:05:59.97 |
+46:07:39.6 |
HIP 473 |
19.22 |
| 2026-04-12 00:00 |
00:06:01.42 |
+46:07:48.0 |
HIP 473 |
19.40 |
| 2026-04-12 12:00 |
00:06:02.86 |
+46:07:56.5 |
HIP 473 |
19.59 |
| 2026-04-13 00:00 |
00:06:04.30 |
+46:08:05.1 |
HIP 473 |
19.78 |
| 2026-04-13 12:00 |
00:06:05.73 |
+46:08:13.7 |
HIP 473 |
19.98 |
| 2026-04-14 00:00 |
00:06:07.16 |
+46:08:22.5 |
HIP 473 |
20.18 |
| 2026-04-14 12:00 |
00:06:08.59 |
+46:08:31.3 |
HIP 473 |
20.38 |
| 2026-04-15 00:00 |
00:06:10.01 |
+46:08:40.2 |
HIP 473 |
20.58 |
| 2026-04-15 12:00 |
00:06:11.42 |
+46:08:49.1 |
HIP 473 |
20.79 |
| 2026-04-16 00:00 |
00:06:12.83 |
+46:08:58.2 |
HIP 473 |
21.00 |