| Parameter |
Value |
| Designation |
C/1942 C1 (Whipple-Bernasconi-Kulin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1942-04-30T19:52:28.176960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:05Z |
| Obs used |
8 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1942-03-29.0000000 |
| e |
1.00101873 |
| q (au) |
1.445344 |
| a (au) |
-1418.765903 |
| i (deg) |
79.454034 |
| Ω (om, deg) |
340.934457 |
| ω (w, deg) |
223.411736 |
| M (ma, deg) |
-0.000605 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.871 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.871 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.520 |
| 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 |
22:25:58.82 |
+21:32:48.6 |
HIP 110752 |
3.67 |
| 2026-03-26 12:00 |
22:25:59.77 |
+21:32:57.5 |
HIP 110752 |
3.48 |
| 2026-03-27 00:00 |
22:26:00.71 |
+21:33:06.5 |
HIP 110752 |
3.31 |
| 2026-03-27 12:00 |
22:26:01.65 |
+21:33:15.5 |
HIP 110752 |
3.15 |
| 2026-03-28 00:00 |
22:26:02.58 |
+21:33:24.6 |
HIP 110752 |
3.01 |
| 2026-03-28 12:00 |
22:26:03.51 |
+21:33:33.7 |
HIP 110752 |
2.89 |
| 2026-03-29 00:00 |
22:26:04.43 |
+21:33:42.8 |
HIP 110752 |
2.79 |
| 2026-03-29 12:00 |
22:26:05.35 |
+21:33:52.0 |
HIP 110752 |
2.71 |
| 2026-03-30 00:00 |
22:26:06.26 |
+21:34:01.2 |
HIP 110752 |
2.66 |
| 2026-03-30 12:00 |
22:26:07.17 |
+21:34:10.4 |
HIP 110752 |
2.63 |
| 2026-03-31 00:00 |
22:26:08.07 |
+21:34:19.7 |
HIP 110752 |
2.63 |
| 2026-03-31 12:00 |
22:26:08.97 |
+21:34:29.0 |
HIP 110752 |
2.66 |
| 2026-04-01 00:00 |
22:26:09.86 |
+21:34:38.4 |
HIP 110752 |
2.71 |
| 2026-04-01 12:00 |
22:26:10.75 |
+21:34:47.7 |
HIP 110752 |
2.78 |
| 2026-04-02 00:00 |
22:26:11.63 |
+21:34:57.1 |
HIP 110752 |
2.88 |
| 2026-04-02 12:00 |
22:26:12.50 |
+21:35:06.6 |
HIP 110752 |
3.00 |
| 2026-04-03 00:00 |
22:26:13.37 |
+21:35:16.1 |
HIP 110752 |
3.14 |
| 2026-04-03 12:00 |
22:26:14.24 |
+21:35:25.6 |
HIP 110752 |
3.29 |
| 2026-04-04 00:00 |
22:26:15.09 |
+21:35:35.1 |
HIP 110752 |
3.45 |
| 2026-04-04 12:00 |
22:26:15.95 |
+21:35:44.7 |
HIP 110752 |
3.63 |
| 2026-04-05 00:00 |
22:26:16.79 |
+21:35:54.3 |
HIP 110752 |
3.81 |
| 2026-04-05 12:00 |
22:26:17.63 |
+21:36:03.9 |
HIP 110752 |
4.00 |
| 2026-04-06 00:00 |
22:26:18.46 |
+21:36:13.5 |
HIP 110752 |
4.20 |
| 2026-04-06 12:00 |
22:26:19.29 |
+21:36:23.2 |
HIP 110752 |
4.40 |
| 2026-04-07 00:00 |
22:26:20.11 |
+21:36:32.9 |
HIP 110752 |
4.61 |
| 2026-04-07 12:00 |
22:26:20.93 |
+21:36:42.6 |
HIP 110752 |
4.82 |
| 2026-04-08 00:00 |
22:26:21.74 |
+21:36:52.4 |
HIP 110752 |
5.04 |
| 2026-04-08 12:00 |
22:26:22.54 |
+21:37:02.2 |
HIP 110752 |
5.26 |
| 2026-04-09 00:00 |
22:26:23.34 |
+21:37:11.9 |
HIP 110752 |
5.48 |
| 2026-04-09 12:00 |
22:26:24.13 |
+21:37:21.8 |
HIP 110752 |
5.70 |
| 2026-04-10 00:00 |
22:26:24.91 |
+21:37:31.6 |
HIP 110752 |
5.92 |
| 2026-04-10 12:00 |
22:26:25.69 |
+21:37:41.5 |
HIP 110752 |
6.15 |
| 2026-04-11 00:00 |
22:26:26.46 |
+21:37:51.4 |
HIP 110752 |
6.37 |
| 2026-04-11 12:00 |
22:26:27.22 |
+21:38:01.3 |
HIP 110752 |
6.60 |
| 2026-04-12 00:00 |
22:26:27.98 |
+21:38:11.2 |
HIP 110752 |
6.83 |
| 2026-04-12 12:00 |
22:26:28.73 |
+21:38:21.1 |
HIP 110752 |
7.06 |
| 2026-04-13 00:00 |
22:26:29.47 |
+21:38:31.1 |
HIP 110752 |
7.29 |
| 2026-04-13 12:00 |
22:26:30.21 |
+21:38:41.1 |
HIP 110752 |
7.52 |
| 2026-04-14 00:00 |
22:26:30.94 |
+21:38:51.1 |
HIP 110752 |
7.74 |
| 2026-04-14 12:00 |
22:26:31.66 |
+21:39:01.1 |
HIP 110752 |
7.97 |
| 2026-04-15 00:00 |
22:26:32.38 |
+21:39:11.1 |
HIP 110752 |
8.20 |
| 2026-04-15 12:00 |
22:26:33.09 |
+21:39:21.2 |
HIP 110752 |
8.43 |
| 2026-04-16 00:00 |
22:26:33.79 |
+21:39:31.2 |
HIP 110752 |
8.66 |