C/1946 K1 (Pajdusakova-Rotbart-Weber)
| 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) |
| 2026-02-03 00:00 |
07:29:59.60 |
+19:47:21.5 |
HIP 36481 |
5.78 |
| 2026-02-03 12:00 |
07:29:58.44 |
+19:47:24.2 |
HIP 36481 |
6.04 |
| 2026-02-04 00:00 |
07:29:57.29 |
+19:47:26.9 |
HIP 36481 |
6.29 |
| 2026-02-04 12:00 |
07:29:56.14 |
+19:47:29.6 |
HIP 36481 |
6.54 |
| 2026-02-05 00:00 |
07:29:55.00 |
+19:47:32.3 |
HIP 36481 |
6.80 |
| 2026-02-05 12:00 |
07:29:53.86 |
+19:47:35.0 |
HIP 36481 |
7.05 |
| 2026-02-06 00:00 |
07:29:52.73 |
+19:47:37.7 |
HIP 36481 |
7.31 |
| 2026-02-06 12:00 |
07:29:51.60 |
+19:47:40.4 |
HIP 36481 |
7.56 |
| 2026-02-07 00:00 |
07:29:50.48 |
+19:47:43.0 |
HIP 36481 |
7.82 |
| 2026-02-07 12:00 |
07:29:49.36 |
+19:47:45.7 |
HIP 36481 |
8.07 |
| 2026-02-08 00:00 |
07:29:48.25 |
+19:47:48.4 |
HIP 36481 |
8.32 |
| 2026-02-08 12:00 |
07:29:47.14 |
+19:47:51.0 |
HIP 36481 |
8.58 |
| 2026-02-09 00:00 |
07:29:46.03 |
+19:47:53.7 |
HIP 36481 |
8.83 |
| 2026-02-09 12:00 |
07:29:44.94 |
+19:47:56.3 |
HIP 36481 |
9.08 |
| 2026-02-10 00:00 |
07:29:43.84 |
+19:47:58.9 |
HIP 36481 |
9.33 |
| 2026-02-10 12:00 |
07:29:42.76 |
+19:48:01.5 |
HIP 36481 |
9.59 |
| 2026-02-11 00:00 |
07:29:41.68 |
+19:48:04.2 |
HIP 36481 |
9.84 |
| 2026-02-11 12:00 |
07:29:40.60 |
+19:48:06.8 |
HIP 36481 |
10.08 |
| 2026-02-12 00:00 |
07:29:39.53 |
+19:48:09.4 |
HIP 36481 |
10.33 |
| 2026-02-12 12:00 |
07:29:38.47 |
+19:48:12.0 |
HIP 36411 |
10.37 |
| 2026-02-13 00:00 |
07:29:37.41 |
+19:48:14.5 |
HIP 36411 |
10.37 |
| 2026-02-13 12:00 |
07:29:36.35 |
+19:48:17.1 |
HIP 36411 |
10.38 |
| 2026-02-14 00:00 |
07:29:35.31 |
+19:48:19.7 |
HIP 36411 |
10.39 |
| 2026-02-14 12:00 |
07:29:34.27 |
+19:48:22.2 |
HIP 36411 |
10.41 |
| 2026-02-15 00:00 |
07:29:33.23 |
+19:48:24.8 |
HIP 36411 |
10.44 |
| 2026-02-15 12:00 |
07:29:32.21 |
+19:48:27.3 |
HIP 36411 |
10.47 |
| 2026-02-16 00:00 |
07:29:31.18 |
+19:48:29.8 |
HIP 36411 |
10.51 |
| 2026-02-16 12:00 |
07:29:30.17 |
+19:48:32.4 |
HIP 36411 |
10.55 |
| 2026-02-17 00:00 |
07:29:29.16 |
+19:48:34.9 |
HIP 36411 |
10.60 |
| 2026-02-17 12:00 |
07:29:28.16 |
+19:48:37.4 |
HIP 36411 |
10.65 |
| 2026-02-18 00:00 |
07:29:27.17 |
+19:48:39.8 |
HIP 36411 |
10.71 |
| 2026-02-18 12:00 |
07:29:26.18 |
+19:48:42.3 |
HIP 36411 |
10.77 |
| 2026-02-19 00:00 |
07:29:25.20 |
+19:48:44.8 |
HIP 36411 |
10.83 |
| 2026-02-19 12:00 |
07:29:24.22 |
+19:48:47.2 |
HIP 36411 |
10.90 |
| 2026-02-20 00:00 |
07:29:23.25 |
+19:48:49.7 |
HIP 36411 |
10.98 |
| 2026-02-20 12:00 |
07:29:22.29 |
+19:48:52.1 |
HIP 36411 |
11.06 |
| 2026-02-21 00:00 |
07:29:21.34 |
+19:48:54.5 |
HIP 36411 |
11.14 |
| 2026-02-21 12:00 |
07:29:20.40 |
+19:48:56.9 |
HIP 36411 |
11.22 |
| 2026-02-22 00:00 |
07:29:19.46 |
+19:48:59.3 |
HIP 36411 |
11.31 |
| 2026-02-22 12:00 |
07:29:18.53 |
+19:49:01.7 |
HIP 36411 |
11.41 |
| 2026-02-23 00:00 |
07:29:17.60 |
+19:49:04.1 |
HIP 36411 |
11.50 |
| 2026-02-23 12:00 |
07:29:16.69 |
+19:49:06.4 |
HIP 36411 |
11.60 |
| 2026-02-24 00:00 |
07:29:15.78 |
+19:49:08.8 |
HIP 36411 |
11.70 |