| 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) |
| 2026-06-01 00:00 |
07:29:17.60 |
+19:50:40.8 |
HIP 36411 |
13.06 |
| 2026-06-01 12:00 |
07:29:18.48 |
+19:50:39.3 |
HIP 36411 |
12.99 |
| 2026-06-02 00:00 |
07:29:19.37 |
+19:50:37.7 |
HIP 36411 |
12.92 |
| 2026-06-02 12:00 |
07:29:20.26 |
+19:50:36.1 |
HIP 36411 |
12.85 |
| 2026-06-03 00:00 |
07:29:21.15 |
+19:50:34.5 |
HIP 36411 |
12.78 |
| 2026-06-03 12:00 |
07:29:22.06 |
+19:50:32.9 |
HIP 36411 |
12.72 |
| 2026-06-04 00:00 |
07:29:22.97 |
+19:50:31.2 |
HIP 36411 |
12.66 |
| 2026-06-04 12:00 |
07:29:23.88 |
+19:50:29.6 |
HIP 36411 |
12.61 |
| 2026-06-05 00:00 |
07:29:24.80 |
+19:50:27.9 |
HIP 36411 |
12.55 |
| 2026-06-05 12:00 |
07:29:25.73 |
+19:50:26.2 |
HIP 36411 |
12.50 |
| 2026-06-06 00:00 |
07:29:26.66 |
+19:50:24.5 |
HIP 36411 |
12.45 |
| 2026-06-06 12:00 |
07:29:27.60 |
+19:50:22.8 |
HIP 36411 |
12.41 |
| 2026-06-07 00:00 |
07:29:28.54 |
+19:50:21.0 |
HIP 36411 |
12.37 |
| 2026-06-07 12:00 |
07:29:29.49 |
+19:50:19.3 |
HIP 36411 |
12.33 |
| 2026-06-08 00:00 |
07:29:30.45 |
+19:50:17.5 |
HIP 36411 |
12.30 |
| 2026-06-08 12:00 |
07:29:31.41 |
+19:50:15.7 |
HIP 36411 |
12.27 |
| 2026-06-09 00:00 |
07:29:32.38 |
+19:50:13.9 |
HIP 36481 |
12.07 |
| 2026-06-09 12:00 |
07:29:33.35 |
+19:50:12.1 |
HIP 36481 |
11.84 |
| 2026-06-10 00:00 |
07:29:34.33 |
+19:50:10.3 |
HIP 36481 |
11.61 |
| 2026-06-10 12:00 |
07:29:35.31 |
+19:50:08.4 |
HIP 36481 |
11.37 |
| 2026-06-11 00:00 |
07:29:36.29 |
+19:50:06.5 |
HIP 36481 |
11.14 |
| 2026-06-11 12:00 |
07:29:37.29 |
+19:50:04.7 |
HIP 36481 |
10.90 |
| 2026-06-12 00:00 |
07:29:38.28 |
+19:50:02.8 |
HIP 36481 |
10.67 |
| 2026-06-12 12:00 |
07:29:39.29 |
+19:50:00.8 |
HIP 36481 |
10.43 |
| 2026-06-13 00:00 |
07:29:40.29 |
+19:49:58.9 |
HIP 36481 |
10.19 |
| 2026-06-13 12:00 |
07:29:41.31 |
+19:49:57.0 |
HIP 36481 |
9.95 |
| 2026-06-14 00:00 |
07:29:42.32 |
+19:49:55.0 |
HIP 36481 |
9.71 |
| 2026-06-14 12:00 |
07:29:43.34 |
+19:49:53.0 |
HIP 36481 |
9.47 |
| 2026-06-15 00:00 |
07:29:44.37 |
+19:49:51.0 |
HIP 36481 |
9.22 |
| 2026-06-15 12:00 |
07:29:45.40 |
+19:49:49.0 |
HIP 36481 |
8.98 |
| 2026-06-16 00:00 |
07:29:46.43 |
+19:49:47.0 |
HIP 36481 |
8.73 |
| 2026-06-16 12:00 |
07:29:47.47 |
+19:49:45.0 |
HIP 36481 |
8.49 |
| 2026-06-17 00:00 |
07:29:48.52 |
+19:49:42.9 |
HIP 36481 |
8.24 |
| 2026-06-17 12:00 |
07:29:49.56 |
+19:49:40.9 |
HIP 36481 |
7.99 |
| 2026-06-18 00:00 |
07:29:50.62 |
+19:49:38.8 |
HIP 36481 |
7.74 |
| 2026-06-18 12:00 |
07:29:51.67 |
+19:49:36.7 |
HIP 36481 |
7.49 |
| 2026-06-19 00:00 |
07:29:52.73 |
+19:49:34.6 |
HIP 36481 |
7.24 |
| 2026-06-19 12:00 |
07:29:53.79 |
+19:49:32.5 |
HIP 36481 |
6.99 |
| 2026-06-20 00:00 |
07:29:54.86 |
+19:49:30.3 |
HIP 36481 |
6.73 |
| 2026-06-20 12:00 |
07:29:55.93 |
+19:49:28.2 |
HIP 36481 |
6.48 |
| 2026-06-21 00:00 |
07:29:57.00 |
+19:49:26.0 |
HIP 36481 |
6.22 |
| 2026-06-21 12:00 |
07:29:58.08 |
+19:49:23.9 |
HIP 36481 |
5.97 |
| 2026-06-22 00:00 |
07:29:59.16 |
+19:49:21.7 |
HIP 36481 |
5.71 |