| 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) |
| 2026-07-29 00:00 |
07:53:24.15 |
-39:14:23.6 |
HIP 38476 |
9.56 |
| 2026-07-29 12:00 |
07:53:25.61 |
-39:14:28.1 |
HIP 38476 |
9.71 |
| 2026-07-30 00:00 |
07:53:27.06 |
-39:14:32.6 |
HIP 38476 |
9.86 |
| 2026-07-30 12:00 |
07:53:28.51 |
-39:14:37.3 |
HIP 38476 |
10.01 |
| 2026-07-31 00:00 |
07:53:29.95 |
-39:14:42.1 |
HIP 38476 |
10.17 |
| 2026-07-31 12:00 |
07:53:31.40 |
-39:14:47.1 |
HIP 38476 |
10.34 |
| 2026-08-01 00:00 |
07:53:32.84 |
-39:14:52.1 |
HIP 38476 |
10.50 |
| 2026-08-01 12:00 |
07:53:34.28 |
-39:14:57.3 |
HIP 38476 |
10.68 |
| 2026-08-02 00:00 |
07:53:35.72 |
-39:15:02.6 |
HIP 38476 |
10.85 |
| 2026-08-02 12:00 |
07:53:37.15 |
-39:15:08.0 |
HIP 38476 |
11.03 |
| 2026-08-03 00:00 |
07:53:38.58 |
-39:15:13.5 |
HIP 38476 |
11.21 |
| 2026-08-03 12:00 |
07:53:40.01 |
-39:15:19.2 |
HIP 38476 |
11.39 |
| 2026-08-04 00:00 |
07:53:41.44 |
-39:15:25.0 |
HIP 38476 |
11.58 |
| 2026-08-04 12:00 |
07:53:42.86 |
-39:15:30.9 |
HIP 38476 |
11.77 |
| 2026-08-05 00:00 |
07:53:44.28 |
-39:15:36.9 |
HIP 38476 |
11.97 |
| 2026-08-05 12:00 |
07:53:45.69 |
-39:15:43.0 |
HIP 38476 |
12.16 |
| 2026-08-06 00:00 |
07:53:47.10 |
-39:15:49.3 |
HIP 38476 |
12.36 |
| 2026-08-06 12:00 |
07:53:48.51 |
-39:15:55.6 |
HIP 38476 |
12.56 |
| 2026-08-07 00:00 |
07:53:49.92 |
-39:16:02.1 |
HIP 38476 |
12.76 |
| 2026-08-07 12:00 |
07:53:51.32 |
-39:16:08.7 |
HIP 38476 |
12.96 |
| 2026-08-08 00:00 |
07:53:52.72 |
-39:16:15.5 |
HIP 38476 |
13.17 |
| 2026-08-08 12:00 |
07:53:54.11 |
-39:16:22.3 |
HIP 38476 |
13.38 |
| 2026-08-09 00:00 |
07:53:55.50 |
-39:16:29.3 |
HIP 38476 |
13.59 |
| 2026-08-09 12:00 |
07:53:56.89 |
-39:16:36.3 |
HIP 38476 |
13.80 |
| 2026-08-10 00:00 |
07:53:58.27 |
-39:16:43.5 |
HIP 38476 |
14.01 |
| 2026-08-10 12:00 |
07:53:59.64 |
-39:16:50.8 |
HIP 38476 |
14.22 |
| 2026-08-11 00:00 |
07:54:01.02 |
-39:16:58.3 |
HIP 38476 |
14.44 |
| 2026-08-11 12:00 |
07:54:02.38 |
-39:17:05.8 |
HIP 38476 |
14.66 |
| 2026-08-12 00:00 |
07:54:03.75 |
-39:17:13.4 |
HIP 38476 |
14.87 |
| 2026-08-12 12:00 |
07:54:05.11 |
-39:17:21.2 |
HIP 38476 |
15.09 |
| 2026-08-13 00:00 |
07:54:06.46 |
-39:17:29.1 |
HIP 38476 |
15.31 |
| 2026-08-13 12:00 |
07:54:07.81 |
-39:17:37.1 |
HIP 38476 |
15.53 |
| 2026-08-14 00:00 |
07:54:09.15 |
-39:17:45.2 |
HIP 38476 |
15.76 |
| 2026-08-14 12:00 |
07:54:10.49 |
-39:17:53.4 |
HIP 38476 |
15.98 |
| 2026-08-15 00:00 |
07:54:11.82 |
-39:18:01.7 |
HIP 38476 |
16.20 |
| 2026-08-15 12:00 |
07:54:13.15 |
-39:18:10.2 |
HIP 38476 |
16.43 |
| 2026-08-16 00:00 |
07:54:14.47 |
-39:18:18.7 |
HIP 38476 |
16.65 |
| 2026-08-16 12:00 |
07:54:15.79 |
-39:18:27.4 |
HIP 38476 |
16.88 |
| 2026-08-17 00:00 |
07:54:17.10 |
-39:18:36.1 |
HIP 38476 |
17.11 |
| 2026-08-17 12:00 |
07:54:18.40 |
-39:18:45.0 |
HIP 38476 |
17.33 |
| 2026-08-18 00:00 |
07:54:19.70 |
-39:18:54.0 |
HIP 38476 |
17.56 |
| 2026-08-18 12:00 |
07:54:21.00 |
-39:19:03.0 |
HIP 38476 |
17.79 |
| 2026-08-19 00:00 |
07:54:22.28 |
-39:19:12.2 |
HIP 38476 |
18.02 |