| 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 |
0.999 |
| 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) |
| 2026-03-26 00:00 |
07:50:10.69 |
-39:50:59.4 |
HIP 38369 |
21.55 |
| 2026-03-26 12:00 |
07:50:10.13 |
-39:50:44.4 |
HIP 38369 |
21.79 |
| 2026-03-27 00:00 |
07:50:09.58 |
-39:50:29.3 |
HIP 38369 |
22.03 |
| 2026-03-27 12:00 |
07:50:09.04 |
-39:50:14.1 |
HIP 38369 |
22.26 |
| 2026-03-28 00:00 |
07:50:08.52 |
-39:49:59.0 |
HIP 38369 |
22.50 |
| 2026-03-28 12:00 |
07:50:08.01 |
-39:49:43.8 |
HIP 38369 |
22.74 |
| 2026-03-29 00:00 |
07:50:07.51 |
-39:49:28.5 |
HIP 38369 |
22.97 |
| 2026-03-29 12:00 |
07:50:07.03 |
-39:49:13.3 |
HIP 38369 |
23.21 |
| 2026-03-30 00:00 |
07:50:06.55 |
-39:48:58.0 |
HIP 38369 |
23.44 |
| 2026-03-30 12:00 |
07:50:06.09 |
-39:48:42.7 |
HIP 38369 |
23.68 |
| 2026-03-31 00:00 |
07:50:05.64 |
-39:48:27.4 |
HIP 38369 |
23.91 |
| 2026-03-31 12:00 |
07:50:05.21 |
-39:48:12.1 |
HIP 38369 |
24.14 |
| 2026-04-01 00:00 |
07:50:04.79 |
-39:47:56.7 |
HIP 38369 |
24.37 |
| 2026-04-01 12:00 |
07:50:04.38 |
-39:47:41.3 |
HIP 38369 |
24.60 |
| 2026-04-02 00:00 |
07:50:03.98 |
-39:47:26.0 |
HIP 38369 |
24.83 |
| 2026-04-02 12:00 |
07:50:03.60 |
-39:47:10.5 |
HIP 38369 |
25.06 |
| 2026-04-03 00:00 |
07:50:03.23 |
-39:46:55.1 |
HIP 38369 |
25.29 |
| 2026-04-03 12:00 |
07:50:02.87 |
-39:46:39.7 |
HIP 38369 |
25.52 |
| 2026-04-04 00:00 |
07:50:02.53 |
-39:46:24.2 |
HIP 38369 |
25.74 |
| 2026-04-04 12:00 |
07:50:02.19 |
-39:46:08.7 |
HIP 38071 |
25.68 |
| 2026-04-05 00:00 |
07:50:01.88 |
-39:45:53.3 |
HIP 38071 |
25.50 |
| 2026-04-05 12:00 |
07:50:01.57 |
-39:45:37.8 |
HIP 38071 |
25.33 |
| 2026-04-06 00:00 |
07:50:01.28 |
-39:45:22.3 |
HIP 38071 |
25.16 |
| 2026-04-06 12:00 |
07:50:01.00 |
-39:45:06.8 |
HIP 38071 |
24.99 |
| 2026-04-07 00:00 |
07:50:00.73 |
-39:44:51.3 |
HIP 38071 |
24.83 |
| 2026-04-07 12:00 |
07:50:00.48 |
-39:44:35.7 |
HIP 38071 |
24.67 |
| 2026-04-08 00:00 |
07:50:00.24 |
-39:44:20.2 |
HIP 38071 |
24.52 |
| 2026-04-08 12:00 |
07:50:00.01 |
-39:44:04.7 |
HIP 38071 |
24.37 |
| 2026-04-09 00:00 |
07:49:59.79 |
-39:43:49.2 |
HIP 38071 |
24.22 |
| 2026-04-09 12:00 |
07:49:59.59 |
-39:43:33.6 |
HIP 38071 |
24.08 |
| 2026-04-10 00:00 |
07:49:59.40 |
-39:43:18.1 |
HIP 38071 |
23.95 |
| 2026-04-10 12:00 |
07:49:59.23 |
-39:43:02.6 |
HIP 38071 |
23.81 |
| 2026-04-11 00:00 |
07:49:59.06 |
-39:42:47.0 |
HIP 38071 |
23.69 |
| 2026-04-11 12:00 |
07:49:58.92 |
-39:42:31.5 |
HIP 38071 |
23.56 |
| 2026-04-12 00:00 |
07:49:58.78 |
-39:42:16.0 |
HIP 38071 |
23.44 |
| 2026-04-12 12:00 |
07:49:58.66 |
-39:42:00.5 |
HIP 38071 |
23.33 |
| 2026-04-13 00:00 |
07:49:58.55 |
-39:41:45.0 |
HIP 38071 |
23.22 |
| 2026-04-13 12:00 |
07:49:58.45 |
-39:41:29.5 |
HIP 38071 |
23.12 |
| 2026-04-14 00:00 |
07:49:58.37 |
-39:41:14.0 |
HIP 38071 |
23.02 |
| 2026-04-14 12:00 |
07:49:58.30 |
-39:40:58.5 |
HIP 38071 |
22.92 |
| 2026-04-15 00:00 |
07:49:58.24 |
-39:40:43.0 |
HIP 38071 |
22.83 |
| 2026-04-15 12:00 |
07:49:58.19 |
-39:40:27.6 |
HIP 38071 |
22.75 |
| 2026-04-16 00:00 |
07:49:58.16 |
-39:40:12.2 |
HIP 38071 |
22.67 |