| Parameter |
Value |
| Designation |
C/1937 C1 (Whipple) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1937-06-20T01:32:24.322560Z |
| Orbit solution date (soln_date, UTC) |
2024-02-20T20:16:47Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
4.200 |
| K1 |
16.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1937-05-22.0000000 |
| e |
1.00016227 |
| q (au) |
1.733769 |
| a (au) |
-10684.390242 |
| i (deg) |
41.551722 |
| Ω (om, deg) |
128.608063 |
| ω (w, deg) |
107.736032 |
| M (ma, deg) |
-0.000026 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.940 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.940 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.526 |
| 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) |
| 2026-09-20 00:00 |
03:34:50.69 |
-23:51:04.8 |
HIP 16743 |
9.10 |
| 2026-09-20 12:00 |
03:34:50.10 |
-23:51:15.6 |
HIP 16743 |
9.09 |
| 2026-09-21 00:00 |
03:34:49.50 |
-23:51:26.4 |
HIP 16743 |
9.10 |
| 2026-09-21 12:00 |
03:34:48.90 |
-23:51:37.2 |
HIP 16743 |
9.10 |
| 2026-09-22 00:00 |
03:34:48.28 |
-23:51:48.0 |
HIP 16743 |
9.12 |
| 2026-09-22 12:00 |
03:34:47.65 |
-23:51:58.7 |
HIP 16743 |
9.15 |
| 2026-09-23 00:00 |
03:34:47.02 |
-23:52:09.4 |
HIP 16743 |
9.18 |
| 2026-09-23 12:00 |
03:34:46.38 |
-23:52:20.0 |
HIP 16743 |
9.22 |
| 2026-09-24 00:00 |
03:34:45.73 |
-23:52:30.6 |
HIP 16743 |
9.26 |
| 2026-09-24 12:00 |
03:34:45.07 |
-23:52:41.2 |
HIP 16743 |
9.32 |
| 2026-09-25 00:00 |
03:34:44.40 |
-23:52:51.8 |
HIP 16743 |
9.38 |
| 2026-09-25 12:00 |
03:34:43.73 |
-23:53:02.3 |
HIP 16743 |
9.45 |
| 2026-09-26 00:00 |
03:34:43.05 |
-23:53:12.8 |
HIP 16743 |
9.53 |
| 2026-09-26 12:00 |
03:34:42.36 |
-23:53:23.2 |
HIP 16743 |
9.61 |
| 2026-09-27 00:00 |
03:34:41.66 |
-23:53:33.6 |
HIP 16743 |
9.70 |
| 2026-09-27 12:00 |
03:34:40.95 |
-23:53:44.0 |
HIP 16743 |
9.80 |
| 2026-09-28 00:00 |
03:34:40.24 |
-23:53:54.3 |
HIP 16743 |
9.90 |
| 2026-09-28 12:00 |
03:34:39.52 |
-23:54:04.6 |
HIP 16743 |
10.01 |
| 2026-09-29 00:00 |
03:34:38.79 |
-23:54:14.8 |
HIP 16743 |
10.12 |
| 2026-09-29 12:00 |
03:34:38.05 |
-23:54:25.0 |
HIP 16743 |
10.25 |
| 2026-09-30 00:00 |
03:34:37.31 |
-23:54:35.2 |
HIP 16743 |
10.37 |
| 2026-09-30 12:00 |
03:34:36.55 |
-23:54:45.3 |
HIP 16743 |
10.51 |
| 2026-10-01 00:00 |
03:34:35.79 |
-23:54:55.3 |
HIP 16743 |
10.65 |
| 2026-10-01 12:00 |
03:34:35.02 |
-23:55:05.4 |
HIP 16743 |
10.79 |
| 2026-10-02 00:00 |
03:34:34.25 |
-23:55:15.4 |
HIP 16743 |
10.94 |
| 2026-10-02 12:00 |
03:34:33.47 |
-23:55:25.3 |
HIP 16743 |
11.10 |
| 2026-10-03 00:00 |
03:34:32.68 |
-23:55:35.2 |
HIP 16743 |
11.26 |
| 2026-10-03 12:00 |
03:34:31.88 |
-23:55:45.0 |
HIP 16743 |
11.42 |
| 2026-10-04 00:00 |
03:34:31.07 |
-23:55:54.8 |
HIP 16743 |
11.59 |
| 2026-10-04 12:00 |
03:34:30.26 |
-23:56:04.6 |
HIP 16743 |
11.77 |
| 2026-10-05 00:00 |
03:34:29.44 |
-23:56:14.2 |
HIP 16743 |
11.94 |
| 2026-10-05 12:00 |
03:34:28.62 |
-23:56:23.9 |
HIP 16743 |
12.13 |
| 2026-10-06 00:00 |
03:34:27.78 |
-23:56:33.5 |
HIP 16743 |
12.31 |
| 2026-10-06 12:00 |
03:34:26.94 |
-23:56:43.0 |
HIP 16743 |
12.50 |
| 2026-10-07 00:00 |
03:34:26.10 |
-23:56:52.5 |
HIP 16743 |
12.70 |
| 2026-10-07 12:00 |
03:34:25.24 |
-23:57:01.9 |
HIP 16743 |
12.89 |
| 2026-10-08 00:00 |
03:34:24.38 |
-23:57:11.3 |
HIP 16743 |
13.09 |
| 2026-10-08 12:00 |
03:34:23.51 |
-23:57:20.6 |
HIP 16743 |
13.30 |
| 2026-10-09 00:00 |
03:34:22.64 |
-23:57:29.9 |
HIP 16743 |
13.50 |
| 2026-10-09 12:00 |
03:34:21.76 |
-23:57:39.1 |
HIP 16743 |
13.71 |
| 2026-10-10 00:00 |
03:34:20.87 |
-23:57:48.2 |
HIP 16743 |
13.93 |
| 2026-10-10 12:00 |
03:34:19.98 |
-23:57:57.3 |
HIP 16743 |
14.14 |
| 2026-10-11 00:00 |
03:34:19.08 |
-23:58:06.3 |
HIP 16743 |
14.36 |