| 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) |
| 2026-06-01 00:00 |
22:27:02.91 |
+21:54:20.0 |
HIP 110791 |
4.37 |
| 2026-06-01 12:00 |
22:27:02.81 |
+21:54:28.3 |
HIP 110791 |
4.42 |
| 2026-06-02 00:00 |
22:27:02.70 |
+21:54:36.5 |
HIP 110791 |
4.47 |
| 2026-06-02 12:00 |
22:27:02.58 |
+21:54:44.7 |
HIP 110791 |
4.53 |
| 2026-06-03 00:00 |
22:27:02.46 |
+21:54:52.8 |
HIP 110791 |
4.58 |
| 2026-06-03 12:00 |
22:27:02.32 |
+21:55:00.9 |
HIP 110791 |
4.64 |
| 2026-06-04 00:00 |
22:27:02.17 |
+21:55:09.0 |
HIP 110791 |
4.69 |
| 2026-06-04 12:00 |
22:27:02.02 |
+21:55:17.0 |
HIP 110791 |
4.75 |
| 2026-06-05 00:00 |
22:27:01.86 |
+21:55:24.9 |
HIP 110791 |
4.81 |
| 2026-06-05 12:00 |
22:27:01.68 |
+21:55:32.8 |
HIP 110791 |
4.87 |
| 2026-06-06 00:00 |
22:27:01.50 |
+21:55:40.6 |
HIP 110791 |
4.93 |
| 2026-06-06 12:00 |
22:27:01.31 |
+21:55:48.4 |
HIP 110791 |
4.99 |
| 2026-06-07 00:00 |
22:27:01.11 |
+21:55:56.1 |
HIP 110791 |
5.06 |
| 2026-06-07 12:00 |
22:27:00.90 |
+21:56:03.8 |
HIP 110791 |
5.12 |
| 2026-06-08 00:00 |
22:27:00.68 |
+21:56:11.4 |
HIP 110791 |
5.19 |
| 2026-06-08 12:00 |
22:27:00.46 |
+21:56:19.0 |
HIP 110791 |
5.25 |
| 2026-06-09 00:00 |
22:27:00.22 |
+21:56:26.5 |
HIP 110791 |
5.32 |
| 2026-06-09 12:00 |
22:26:59.97 |
+21:56:34.0 |
HIP 110791 |
5.38 |
| 2026-06-10 00:00 |
22:26:59.72 |
+21:56:41.3 |
HIP 110791 |
5.45 |
| 2026-06-10 12:00 |
22:26:59.46 |
+21:56:48.7 |
HIP 110791 |
5.52 |
| 2026-06-11 00:00 |
22:26:59.18 |
+21:56:56.0 |
HIP 110791 |
5.59 |
| 2026-06-11 12:00 |
22:26:58.90 |
+21:57:03.2 |
HIP 110791 |
5.66 |
| 2026-06-12 00:00 |
22:26:58.61 |
+21:57:10.3 |
HIP 110791 |
5.73 |
| 2026-06-12 12:00 |
22:26:58.31 |
+21:57:17.4 |
HIP 110791 |
5.80 |
| 2026-06-13 00:00 |
22:26:58.01 |
+21:57:24.5 |
HIP 110791 |
5.87 |
| 2026-06-13 12:00 |
22:26:57.69 |
+21:57:31.4 |
HIP 110791 |
5.94 |
| 2026-06-14 00:00 |
22:26:57.36 |
+21:57:38.4 |
HIP 110791 |
6.01 |
| 2026-06-14 12:00 |
22:26:57.03 |
+21:57:45.2 |
HIP 110791 |
6.08 |
| 2026-06-15 00:00 |
22:26:56.68 |
+21:57:52.0 |
HIP 110791 |
6.16 |
| 2026-06-15 12:00 |
22:26:56.33 |
+21:57:58.7 |
HIP 110791 |
6.23 |
| 2026-06-16 00:00 |
22:26:55.97 |
+21:58:05.4 |
HIP 110791 |
6.30 |
| 2026-06-16 12:00 |
22:26:55.60 |
+21:58:12.0 |
HIP 110791 |
6.38 |
| 2026-06-17 00:00 |
22:26:55.22 |
+21:58:18.5 |
HIP 110791 |
6.45 |
| 2026-06-17 12:00 |
22:26:54.83 |
+21:58:25.0 |
HIP 110791 |
6.53 |
| 2026-06-18 00:00 |
22:26:54.44 |
+21:58:31.4 |
HIP 110791 |
6.60 |
| 2026-06-18 12:00 |
22:26:54.03 |
+21:58:37.7 |
HIP 110791 |
6.68 |
| 2026-06-19 00:00 |
22:26:53.62 |
+21:58:44.0 |
HIP 110791 |
6.76 |
| 2026-06-19 12:00 |
22:26:53.20 |
+21:58:50.2 |
HIP 110791 |
6.83 |
| 2026-06-20 00:00 |
22:26:52.77 |
+21:58:56.3 |
HIP 110791 |
6.91 |
| 2026-06-20 12:00 |
22:26:52.33 |
+21:59:02.4 |
HIP 110791 |
6.99 |
| 2026-06-21 00:00 |
22:26:51.88 |
+21:59:08.4 |
HIP 110791 |
7.07 |
| 2026-06-21 12:00 |
22:26:51.43 |
+21:59:14.3 |
HIP 110791 |
7.15 |
| 2026-06-22 00:00 |
22:26:50.96 |
+21:59:20.2 |
HIP 110791 |
7.23 |