| 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) |
| 2026-05-12 00:00 |
07:50:14.10 |
-39:27:37.2 |
HIP 38250 |
22.78 |
| 2026-05-12 12:00 |
07:50:14.73 |
-39:27:24.1 |
HIP 38250 |
22.57 |
| 2026-05-13 00:00 |
07:50:15.37 |
-39:27:11.0 |
HIP 38250 |
22.36 |
| 2026-05-13 12:00 |
07:50:16.02 |
-39:26:58.1 |
HIP 38250 |
22.15 |
| 2026-05-14 00:00 |
07:50:16.68 |
-39:26:45.2 |
HIP 38250 |
21.94 |
| 2026-05-14 12:00 |
07:50:17.35 |
-39:26:32.3 |
HIP 38250 |
21.74 |
| 2026-05-15 00:00 |
07:50:18.04 |
-39:26:19.6 |
HIP 38250 |
21.54 |
| 2026-05-15 12:00 |
07:50:18.74 |
-39:26:06.9 |
HIP 38250 |
21.34 |
| 2026-05-16 00:00 |
07:50:19.44 |
-39:25:54.3 |
HIP 38250 |
21.15 |
| 2026-05-16 12:00 |
07:50:20.16 |
-39:25:41.8 |
HIP 38250 |
20.96 |
| 2026-05-17 00:00 |
07:50:20.89 |
-39:25:29.3 |
HIP 38250 |
20.77 |
| 2026-05-17 12:00 |
07:50:21.63 |
-39:25:17.0 |
HIP 38250 |
20.58 |
| 2026-05-18 00:00 |
07:50:22.38 |
-39:25:04.7 |
HIP 38250 |
20.39 |
| 2026-05-18 12:00 |
07:50:23.15 |
-39:24:52.5 |
HIP 38250 |
20.21 |
| 2026-05-19 00:00 |
07:50:23.92 |
-39:24:40.4 |
HIP 38250 |
20.04 |
| 2026-05-19 12:00 |
07:50:24.70 |
-39:24:28.3 |
HIP 38250 |
19.86 |
| 2026-05-20 00:00 |
07:50:25.50 |
-39:24:16.4 |
HIP 38250 |
19.69 |
| 2026-05-20 12:00 |
07:50:26.30 |
-39:24:04.5 |
HIP 38250 |
19.52 |
| 2026-05-21 00:00 |
07:50:27.12 |
-39:23:52.7 |
HIP 38250 |
19.36 |
| 2026-05-21 12:00 |
07:50:27.94 |
-39:23:41.0 |
HIP 38250 |
19.20 |
| 2026-05-22 00:00 |
07:50:28.78 |
-39:23:29.4 |
HIP 38250 |
19.04 |
| 2026-05-22 12:00 |
07:50:29.63 |
-39:23:17.9 |
HIP 38250 |
18.89 |
| 2026-05-23 00:00 |
07:50:30.48 |
-39:23:06.4 |
HIP 38250 |
18.74 |
| 2026-05-23 12:00 |
07:50:31.35 |
-39:22:55.1 |
HIP 38250 |
18.60 |
| 2026-05-24 00:00 |
07:50:32.23 |
-39:22:43.8 |
HIP 38250 |
18.46 |
| 2026-05-24 12:00 |
07:50:33.11 |
-39:22:32.7 |
HIP 38250 |
18.32 |
| 2026-05-25 00:00 |
07:50:34.01 |
-39:22:21.6 |
HIP 38250 |
18.19 |
| 2026-05-25 12:00 |
07:50:34.91 |
-39:22:10.6 |
HIP 38250 |
18.06 |
| 2026-05-26 00:00 |
07:50:35.83 |
-39:21:59.7 |
HIP 38250 |
17.94 |
| 2026-05-26 12:00 |
07:50:36.76 |
-39:21:48.9 |
HIP 38250 |
17.83 |
| 2026-05-27 00:00 |
07:50:37.69 |
-39:21:38.2 |
HIP 38250 |
17.71 |
| 2026-05-27 12:00 |
07:50:38.64 |
-39:21:27.6 |
HIP 38250 |
17.61 |
| 2026-05-28 00:00 |
07:50:39.59 |
-39:21:17.1 |
HIP 38250 |
17.50 |
| 2026-05-28 12:00 |
07:50:40.55 |
-39:21:06.7 |
HIP 38250 |
17.41 |
| 2026-05-29 00:00 |
07:50:41.53 |
-39:20:56.3 |
HIP 38250 |
17.32 |
| 2026-05-29 12:00 |
07:50:42.51 |
-39:20:46.1 |
HIP 38250 |
17.23 |
| 2026-05-30 00:00 |
07:50:43.50 |
-39:20:36.0 |
HIP 38250 |
17.15 |
| 2026-05-30 12:00 |
07:50:44.50 |
-39:20:25.9 |
HIP 38250 |
17.08 |
| 2026-05-31 00:00 |
07:50:45.51 |
-39:20:16.0 |
HIP 38250 |
17.01 |
| 2026-05-31 12:00 |
07:50:46.53 |
-39:20:06.2 |
HIP 38250 |
16.95 |
| 2026-06-01 00:00 |
07:50:47.56 |
-39:19:56.4 |
HIP 38250 |
16.89 |
| 2026-06-01 12:00 |
07:50:48.59 |
-39:19:46.8 |
HIP 38250 |
16.84 |
| 2026-06-02 00:00 |
07:50:49.64 |
-39:19:37.3 |
HIP 38250 |
16.79 |