| Parameter |
Value |
| Designation |
C/1951 C1 (Pajdusakova) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1951-01-30T10:13:38.858880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1951-03-17.0000000 |
| e |
1.00000000 |
| q (au) |
0.719061 |
| a (au) |
- |
| i (deg) |
87.896744 |
| Ω (om, deg) |
311.219655 |
| ω (w, deg) |
68.601740 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (9.458 + 5.562\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.458 |
| n |
5.562 |
| gf |
1.000 |
| gb |
-0.881 |
| 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 |
07:55:28.35 |
-39:32:08.4 |
HIP 38628 |
11.91 |
| 2026-09-20 12:00 |
07:55:29.07 |
-39:32:22.9 |
HIP 38628 |
11.90 |
| 2026-09-21 00:00 |
07:55:29.78 |
-39:32:37.5 |
HIP 38628 |
11.89 |
| 2026-09-21 12:00 |
07:55:30.48 |
-39:32:52.1 |
HIP 38628 |
11.89 |
| 2026-09-22 00:00 |
07:55:31.16 |
-39:33:06.7 |
HIP 38628 |
11.89 |
| 2026-09-22 12:00 |
07:55:31.84 |
-39:33:21.4 |
HIP 38628 |
11.90 |
| 2026-09-23 00:00 |
07:55:32.50 |
-39:33:36.2 |
HIP 38628 |
11.91 |
| 2026-09-23 12:00 |
07:55:33.16 |
-39:33:51.0 |
HIP 38628 |
11.92 |
| 2026-09-24 00:00 |
07:55:33.80 |
-39:34:05.8 |
HIP 38628 |
11.94 |
| 2026-09-24 12:00 |
07:55:34.43 |
-39:34:20.7 |
HIP 38628 |
11.96 |
| 2026-09-25 00:00 |
07:55:35.05 |
-39:34:35.6 |
HIP 38628 |
11.99 |
| 2026-09-25 12:00 |
07:55:35.66 |
-39:34:50.6 |
HIP 38628 |
12.02 |
| 2026-09-26 00:00 |
07:55:36.25 |
-39:35:05.6 |
HIP 38628 |
12.05 |
| 2026-09-26 12:00 |
07:55:36.84 |
-39:35:20.7 |
HIP 38628 |
12.09 |
| 2026-09-27 00:00 |
07:55:37.41 |
-39:35:35.8 |
HIP 38628 |
12.13 |
| 2026-09-27 12:00 |
07:55:37.97 |
-39:35:50.9 |
HIP 38628 |
12.17 |
| 2026-09-28 00:00 |
07:55:38.52 |
-39:36:06.1 |
HIP 38628 |
12.22 |
| 2026-09-28 12:00 |
07:55:39.06 |
-39:36:21.3 |
HIP 38628 |
12.27 |
| 2026-09-29 00:00 |
07:55:39.59 |
-39:36:36.6 |
HIP 38628 |
12.33 |
| 2026-09-29 12:00 |
07:55:40.10 |
-39:36:51.9 |
HIP 38628 |
12.39 |
| 2026-09-30 00:00 |
07:55:40.60 |
-39:37:07.2 |
HIP 38628 |
12.45 |
| 2026-09-30 12:00 |
07:55:41.09 |
-39:37:22.5 |
HIP 38628 |
12.52 |
| 2026-10-01 00:00 |
07:55:41.57 |
-39:37:37.9 |
HIP 38628 |
12.59 |
| 2026-10-01 12:00 |
07:55:42.03 |
-39:37:53.3 |
HIP 38628 |
12.66 |
| 2026-10-02 00:00 |
07:55:42.49 |
-39:38:08.8 |
HIP 38628 |
12.73 |
| 2026-10-02 12:00 |
07:55:42.93 |
-39:38:24.3 |
HIP 38628 |
12.81 |
| 2026-10-03 00:00 |
07:55:43.36 |
-39:38:39.8 |
HIP 38628 |
12.89 |
| 2026-10-03 12:00 |
07:55:43.78 |
-39:38:55.3 |
HIP 38628 |
12.98 |
| 2026-10-04 00:00 |
07:55:44.18 |
-39:39:10.9 |
HIP 38628 |
13.06 |
| 2026-10-04 12:00 |
07:55:44.57 |
-39:39:26.5 |
HIP 38628 |
13.15 |
| 2026-10-05 00:00 |
07:55:44.95 |
-39:39:42.1 |
HIP 38628 |
13.24 |
| 2026-10-05 12:00 |
07:55:45.32 |
-39:39:57.7 |
HIP 38628 |
13.34 |
| 2026-10-06 00:00 |
07:55:45.67 |
-39:40:13.4 |
HIP 38628 |
13.44 |
| 2026-10-06 12:00 |
07:55:46.02 |
-39:40:29.0 |
HIP 38628 |
13.53 |
| 2026-10-07 00:00 |
07:55:46.35 |
-39:40:44.7 |
HIP 38628 |
13.64 |
| 2026-10-07 12:00 |
07:55:46.66 |
-39:41:00.5 |
HIP 38628 |
13.74 |
| 2026-10-08 00:00 |
07:55:46.97 |
-39:41:16.2 |
HIP 38628 |
13.84 |
| 2026-10-08 12:00 |
07:55:47.26 |
-39:41:31.9 |
HIP 38628 |
13.95 |
| 2026-10-09 00:00 |
07:55:47.54 |
-39:41:47.7 |
HIP 38628 |
14.06 |
| 2026-10-09 12:00 |
07:55:47.80 |
-39:42:03.5 |
HIP 38628 |
14.17 |
| 2026-10-10 00:00 |
07:55:48.06 |
-39:42:19.3 |
HIP 38628 |
14.29 |
| 2026-10-10 12:00 |
07:55:48.30 |
-39:42:35.1 |
HIP 38628 |
14.40 |
| 2026-10-11 00:00 |
07:55:48.52 |
-39:42:50.9 |
HIP 38628 |
14.52 |