| 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) |
| 2026-03-26 00:00 |
07:28:37.10 |
+19:51:00.5 |
HIP 36319 |
11.82 |
| 2026-03-26 12:00 |
07:28:36.75 |
+19:51:01.8 |
HIP 36319 |
11.84 |
| 2026-03-27 00:00 |
07:28:36.41 |
+19:51:03.0 |
HIP 36319 |
11.85 |
| 2026-03-27 12:00 |
07:28:36.07 |
+19:51:04.3 |
HIP 36319 |
11.87 |
| 2026-03-28 00:00 |
07:28:35.75 |
+19:51:05.5 |
HIP 36319 |
11.89 |
| 2026-03-28 12:00 |
07:28:35.44 |
+19:51:06.8 |
HIP 36319 |
11.90 |
| 2026-03-29 00:00 |
07:28:35.14 |
+19:51:08.0 |
HIP 36319 |
11.92 |
| 2026-03-29 12:00 |
07:28:34.85 |
+19:51:09.1 |
HIP 36319 |
11.94 |
| 2026-03-30 00:00 |
07:28:34.56 |
+19:51:10.3 |
HIP 36319 |
11.96 |
| 2026-03-30 12:00 |
07:28:34.29 |
+19:51:11.4 |
HIP 36319 |
11.97 |
| 2026-03-31 00:00 |
07:28:34.03 |
+19:51:12.5 |
HIP 36319 |
11.99 |
| 2026-03-31 12:00 |
07:28:33.78 |
+19:51:13.6 |
HIP 36319 |
12.01 |
| 2026-04-01 00:00 |
07:28:33.54 |
+19:51:14.7 |
HIP 36319 |
12.03 |
| 2026-04-01 12:00 |
07:28:33.31 |
+19:51:15.7 |
HIP 36319 |
12.04 |
| 2026-04-02 00:00 |
07:28:33.09 |
+19:51:16.8 |
HIP 36319 |
12.06 |
| 2026-04-02 12:00 |
07:28:32.88 |
+19:51:17.8 |
HIP 36319 |
12.08 |
| 2026-04-03 00:00 |
07:28:32.68 |
+19:51:18.8 |
HIP 36319 |
12.10 |
| 2026-04-03 12:00 |
07:28:32.49 |
+19:51:19.7 |
HIP 36319 |
12.11 |
| 2026-04-04 00:00 |
07:28:32.31 |
+19:51:20.7 |
HIP 36319 |
12.13 |
| 2026-04-04 12:00 |
07:28:32.14 |
+19:51:21.6 |
HIP 36319 |
12.15 |
| 2026-04-05 00:00 |
07:28:31.99 |
+19:51:22.5 |
HIP 36319 |
12.16 |
| 2026-04-05 12:00 |
07:28:31.84 |
+19:51:23.4 |
HIP 36319 |
12.18 |
| 2026-04-06 00:00 |
07:28:31.70 |
+19:51:24.2 |
HIP 36319 |
12.19 |
| 2026-04-06 12:00 |
07:28:31.57 |
+19:51:25.0 |
HIP 36319 |
12.21 |
| 2026-04-07 00:00 |
07:28:31.46 |
+19:51:25.9 |
HIP 36319 |
12.22 |
| 2026-04-07 12:00 |
07:28:31.35 |
+19:51:26.6 |
HIP 36319 |
12.24 |
| 2026-04-08 00:00 |
07:28:31.25 |
+19:51:27.4 |
HIP 36319 |
12.25 |
| 2026-04-08 12:00 |
07:28:31.17 |
+19:51:28.2 |
HIP 36319 |
12.26 |
| 2026-04-09 00:00 |
07:28:31.09 |
+19:51:28.9 |
HIP 36319 |
12.28 |
| 2026-04-09 12:00 |
07:28:31.03 |
+19:51:29.6 |
HIP 36319 |
12.29 |
| 2026-04-10 00:00 |
07:28:30.97 |
+19:51:30.3 |
HIP 36319 |
12.30 |
| 2026-04-10 12:00 |
07:28:30.93 |
+19:51:30.9 |
HIP 36319 |
12.31 |
| 2026-04-11 00:00 |
07:28:30.89 |
+19:51:31.6 |
HIP 36319 |
12.32 |
| 2026-04-11 12:00 |
07:28:30.87 |
+19:51:32.2 |
HIP 36319 |
12.33 |
| 2026-04-12 00:00 |
07:28:30.86 |
+19:51:32.8 |
HIP 36319 |
12.34 |
| 2026-04-12 12:00 |
07:28:30.85 |
+19:51:33.3 |
HIP 36319 |
12.35 |
| 2026-04-13 00:00 |
07:28:30.86 |
+19:51:33.9 |
HIP 36319 |
12.36 |
| 2026-04-13 12:00 |
07:28:30.88 |
+19:51:34.4 |
HIP 36319 |
12.37 |
| 2026-04-14 00:00 |
07:28:30.91 |
+19:51:34.9 |
HIP 36319 |
12.38 |
| 2026-04-14 12:00 |
07:28:30.94 |
+19:51:35.4 |
HIP 36319 |
12.39 |
| 2026-04-15 00:00 |
07:28:30.99 |
+19:51:35.9 |
HIP 36319 |
12.39 |
| 2026-04-15 12:00 |
07:28:31.05 |
+19:51:36.3 |
HIP 36319 |
12.40 |
| 2026-04-16 00:00 |
07:28:31.12 |
+19:51:36.7 |
HIP 36319 |
12.41 |