| 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) |
| 2026-09-20 00:00 |
07:32:53.49 |
+19:42:12.2 |
HIP 36607 |
22.91 |
| 2026-09-20 12:00 |
07:32:53.95 |
+19:42:10.6 |
HIP 36607 |
23.01 |
| 2026-09-21 00:00 |
07:32:54.40 |
+19:42:09.0 |
HIP 36607 |
23.11 |
| 2026-09-21 12:00 |
07:32:54.84 |
+19:42:07.4 |
HIP 36607 |
23.20 |
| 2026-09-22 00:00 |
07:32:55.27 |
+19:42:05.8 |
HIP 36607 |
23.29 |
| 2026-09-22 12:00 |
07:32:55.69 |
+19:42:04.3 |
HIP 36607 |
23.38 |
| 2026-09-23 00:00 |
07:32:56.10 |
+19:42:02.8 |
HIP 36607 |
23.47 |
| 2026-09-23 12:00 |
07:32:56.51 |
+19:42:01.3 |
HIP 36607 |
23.56 |
| 2026-09-24 00:00 |
07:32:56.90 |
+19:41:59.8 |
HIP 36607 |
23.64 |
| 2026-09-24 12:00 |
07:32:57.28 |
+19:41:58.3 |
HIP 36607 |
23.73 |
| 2026-09-25 00:00 |
07:32:57.66 |
+19:41:56.8 |
HIP 36607 |
23.81 |
| 2026-09-25 12:00 |
07:32:58.02 |
+19:41:55.4 |
HIP 36607 |
23.89 |
| 2026-09-26 00:00 |
07:32:58.38 |
+19:41:54.0 |
HIP 36607 |
23.96 |
| 2026-09-26 12:00 |
07:32:58.73 |
+19:41:52.6 |
HIP 36607 |
24.04 |
| 2026-09-27 00:00 |
07:32:59.06 |
+19:41:51.2 |
HIP 36607 |
24.11 |
| 2026-09-27 12:00 |
07:32:59.39 |
+19:41:49.9 |
HIP 36607 |
24.19 |
| 2026-09-28 00:00 |
07:32:59.71 |
+19:41:48.6 |
HIP 36607 |
24.26 |
| 2026-09-28 12:00 |
07:33:00.01 |
+19:41:47.3 |
HIP 36607 |
24.33 |
| 2026-09-29 00:00 |
07:33:00.31 |
+19:41:46.0 |
HIP 36607 |
24.39 |
| 2026-09-29 12:00 |
07:33:00.60 |
+19:41:44.7 |
HIP 36607 |
24.46 |
| 2026-09-30 00:00 |
07:33:00.88 |
+19:41:43.4 |
HIP 36607 |
24.52 |
| 2026-09-30 12:00 |
07:33:01.15 |
+19:41:42.2 |
HIP 36607 |
24.58 |
| 2026-10-01 00:00 |
07:33:01.40 |
+19:41:41.0 |
HIP 36607 |
24.64 |
| 2026-10-01 12:00 |
07:33:01.65 |
+19:41:39.8 |
HIP 36607 |
24.70 |
| 2026-10-02 00:00 |
07:33:01.89 |
+19:41:38.6 |
HIP 36607 |
24.75 |
| 2026-10-02 12:00 |
07:33:02.12 |
+19:41:37.5 |
HIP 36607 |
24.81 |
| 2026-10-03 00:00 |
07:33:02.34 |
+19:41:36.4 |
HIP 36607 |
24.86 |
| 2026-10-03 12:00 |
07:33:02.55 |
+19:41:35.3 |
HIP 36607 |
24.91 |
| 2026-10-04 00:00 |
07:33:02.75 |
+19:41:34.2 |
HIP 36607 |
24.95 |
| 2026-10-04 12:00 |
07:33:02.94 |
+19:41:33.1 |
HIP 36607 |
25.00 |
| 2026-10-05 00:00 |
07:33:03.11 |
+19:41:32.1 |
HIP 36607 |
25.04 |
| 2026-10-05 12:00 |
07:33:03.28 |
+19:41:31.1 |
HIP 36607 |
25.08 |
| 2026-10-06 00:00 |
07:33:03.44 |
+19:41:30.1 |
HIP 36607 |
25.12 |
| 2026-10-06 12:00 |
07:33:03.59 |
+19:41:29.1 |
HIP 36607 |
25.16 |
| 2026-10-07 00:00 |
07:33:03.73 |
+19:41:28.1 |
HIP 36607 |
25.19 |
| 2026-10-07 12:00 |
07:33:03.85 |
+19:41:27.2 |
HIP 36607 |
25.23 |
| 2026-10-08 00:00 |
07:33:03.97 |
+19:41:26.3 |
HIP 36607 |
25.26 |
| 2026-10-08 12:00 |
07:33:04.08 |
+19:41:25.4 |
HIP 36607 |
25.29 |
| 2026-10-09 00:00 |
07:33:04.18 |
+19:41:24.5 |
HIP 36607 |
25.31 |
| 2026-10-09 12:00 |
07:33:04.26 |
+19:41:23.7 |
HIP 36607 |
25.34 |
| 2026-10-10 00:00 |
07:33:04.34 |
+19:41:22.9 |
HIP 36607 |
25.36 |
| 2026-10-10 12:00 |
07:33:04.40 |
+19:41:22.1 |
HIP 36607 |
25.38 |
| 2026-10-11 00:00 |
07:33:04.46 |
+19:41:21.3 |
HIP 36607 |
25.40 |