| Parameter |
Value |
| Designation |
C/1946 K1 (Pajdusakova-Rotbart-Weber) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1946-05-11T10:41:13.211520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
6 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1946-06-10.0000000 |
| e |
0.99943474 |
| q (au) |
1.018412 |
| a (au) |
1801.671047 |
| i (deg) |
169.559810 |
| Ω (om, deg) |
301.949074 |
| ω (w, deg) |
22.226648 |
| M (ma, deg) |
0.000381 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.823 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.823 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
07:31:23.26 |
+19:46:16.7 |
HIP 36607 |
12.52 |
| 2026-07-29 12:00 |
07:31:24.37 |
+19:46:14.1 |
HIP 36607 |
12.47 |
| 2026-07-30 00:00 |
07:31:25.49 |
+19:46:11.4 |
HIP 36607 |
12.42 |
| 2026-07-30 12:00 |
07:31:26.60 |
+19:46:08.7 |
HIP 36607 |
12.38 |
| 2026-07-31 00:00 |
07:31:27.71 |
+19:46:06.1 |
HIP 36607 |
12.35 |
| 2026-07-31 12:00 |
07:31:28.81 |
+19:46:03.4 |
HIP 36607 |
12.32 |
| 2026-08-01 00:00 |
07:31:29.91 |
+19:46:00.8 |
HIP 36607 |
12.30 |
| 2026-08-01 12:00 |
07:31:31.01 |
+19:45:58.1 |
HIP 36607 |
12.28 |
| 2026-08-02 00:00 |
07:31:32.11 |
+19:45:55.5 |
HIP 36607 |
12.27 |
| 2026-08-02 12:00 |
07:31:33.21 |
+19:45:52.8 |
HIP 36607 |
12.26 |
| 2026-08-03 00:00 |
07:31:34.30 |
+19:45:50.2 |
HIP 36607 |
12.26 |
| 2026-08-03 12:00 |
07:31:35.38 |
+19:45:47.5 |
HIP 36607 |
12.27 |
| 2026-08-04 00:00 |
07:31:36.47 |
+19:45:44.9 |
HIP 36607 |
12.28 |
| 2026-08-04 12:00 |
07:31:37.55 |
+19:45:42.3 |
HIP 36607 |
12.29 |
| 2026-08-05 00:00 |
07:31:38.63 |
+19:45:39.6 |
HIP 36607 |
12.32 |
| 2026-08-05 12:00 |
07:31:39.70 |
+19:45:37.0 |
HIP 36607 |
12.34 |
| 2026-08-06 00:00 |
07:31:40.77 |
+19:45:34.4 |
HIP 36607 |
12.37 |
| 2026-08-06 12:00 |
07:31:41.84 |
+19:45:31.7 |
HIP 36607 |
12.41 |
| 2026-08-07 00:00 |
07:31:42.90 |
+19:45:29.1 |
HIP 36607 |
12.45 |
| 2026-08-07 12:00 |
07:31:43.96 |
+19:45:26.5 |
HIP 36607 |
12.50 |
| 2026-08-08 00:00 |
07:31:45.02 |
+19:45:23.9 |
HIP 36607 |
12.55 |
| 2026-08-08 12:00 |
07:31:46.07 |
+19:45:21.2 |
HIP 36607 |
12.61 |
| 2026-08-09 00:00 |
07:31:47.11 |
+19:45:18.6 |
HIP 36607 |
12.67 |
| 2026-08-09 12:00 |
07:31:48.16 |
+19:45:16.0 |
HIP 36607 |
12.74 |
| 2026-08-10 00:00 |
07:31:49.20 |
+19:45:13.4 |
HIP 36607 |
12.81 |
| 2026-08-10 12:00 |
07:31:50.23 |
+19:45:10.8 |
HIP 36607 |
12.88 |
| 2026-08-11 00:00 |
07:31:51.26 |
+19:45:08.2 |
HIP 36607 |
12.96 |
| 2026-08-11 12:00 |
07:31:52.29 |
+19:45:05.6 |
HIP 36607 |
13.04 |
| 2026-08-12 00:00 |
07:31:53.31 |
+19:45:03.0 |
HIP 36607 |
13.13 |
| 2026-08-12 12:00 |
07:31:54.33 |
+19:45:00.5 |
HIP 36607 |
13.22 |
| 2026-08-13 00:00 |
07:31:55.34 |
+19:44:57.9 |
HIP 36607 |
13.31 |
| 2026-08-13 12:00 |
07:31:56.35 |
+19:44:55.3 |
HIP 36607 |
13.41 |
| 2026-08-14 00:00 |
07:31:57.35 |
+19:44:52.8 |
HIP 36607 |
13.51 |
| 2026-08-14 12:00 |
07:31:58.35 |
+19:44:50.2 |
HIP 36607 |
13.61 |
| 2026-08-15 00:00 |
07:31:59.34 |
+19:44:47.7 |
HIP 36607 |
13.72 |
| 2026-08-15 12:00 |
07:32:00.33 |
+19:44:45.1 |
HIP 36607 |
13.83 |
| 2026-08-16 00:00 |
07:32:01.31 |
+19:44:42.6 |
HIP 36607 |
13.94 |
| 2026-08-16 12:00 |
07:32:02.29 |
+19:44:40.1 |
HIP 36607 |
14.05 |
| 2026-08-17 00:00 |
07:32:03.26 |
+19:44:37.5 |
HIP 36607 |
14.17 |
| 2026-08-17 12:00 |
07:32:04.22 |
+19:44:35.0 |
HIP 36607 |
14.29 |
| 2026-08-18 00:00 |
07:32:05.19 |
+19:44:32.5 |
HIP 36607 |
14.41 |
| 2026-08-18 12:00 |
07:32:06.14 |
+19:44:30.0 |
HIP 36607 |
14.53 |
| 2026-08-19 00:00 |
07:32:07.09 |
+19:44:27.5 |
HIP 36607 |
14.65 |