| 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) |
| 2026-03-26 00:00 |
03:31:05.12 |
-23:35:52.1 |
HIP 16312 |
14.63 |
| 2026-03-26 12:00 |
03:31:05.86 |
-23:35:41.7 |
HIP 16312 |
14.88 |
| 2026-03-27 00:00 |
03:31:06.62 |
-23:35:31.2 |
HIP 16312 |
15.12 |
| 2026-03-27 12:00 |
03:31:07.38 |
-23:35:20.8 |
HIP 16312 |
15.36 |
| 2026-03-28 00:00 |
03:31:08.15 |
-23:35:10.5 |
HIP 16312 |
15.61 |
| 2026-03-28 12:00 |
03:31:08.93 |
-23:35:00.2 |
HIP 16312 |
15.85 |
| 2026-03-29 00:00 |
03:31:09.71 |
-23:34:49.9 |
HIP 16312 |
16.10 |
| 2026-03-29 12:00 |
03:31:10.50 |
-23:34:39.7 |
HIP 16312 |
16.35 |
| 2026-03-30 00:00 |
03:31:11.30 |
-23:34:29.6 |
HIP 16312 |
16.60 |
| 2026-03-30 12:00 |
03:31:12.11 |
-23:34:19.5 |
HIP 16312 |
16.84 |
| 2026-03-31 00:00 |
03:31:12.92 |
-23:34:09.4 |
HIP 16312 |
17.09 |
| 2026-03-31 12:00 |
03:31:13.74 |
-23:33:59.4 |
HIP 16312 |
17.35 |
| 2026-04-01 00:00 |
03:31:14.56 |
-23:33:49.5 |
HIP 16312 |
17.60 |
| 2026-04-01 12:00 |
03:31:15.40 |
-23:33:39.6 |
HIP 16312 |
17.85 |
| 2026-04-02 00:00 |
03:31:16.24 |
-23:33:29.7 |
HIP 16312 |
18.10 |
| 2026-04-02 12:00 |
03:31:17.08 |
-23:33:19.9 |
HIP 16312 |
18.35 |
| 2026-04-03 00:00 |
03:31:17.93 |
-23:33:10.2 |
HIP 16510 |
18.33 |
| 2026-04-03 12:00 |
03:31:18.79 |
-23:33:00.5 |
HIP 16510 |
18.18 |
| 2026-04-04 00:00 |
03:31:19.66 |
-23:32:50.8 |
HIP 16510 |
18.04 |
| 2026-04-04 12:00 |
03:31:20.53 |
-23:32:41.2 |
HIP 16510 |
17.89 |
| 2026-04-05 00:00 |
03:31:21.41 |
-23:32:31.7 |
HIP 16510 |
17.74 |
| 2026-04-05 12:00 |
03:31:22.29 |
-23:32:22.2 |
HIP 16510 |
17.59 |
| 2026-04-06 00:00 |
03:31:23.18 |
-23:32:12.8 |
HIP 16510 |
17.45 |
| 2026-04-06 12:00 |
03:31:24.08 |
-23:32:03.4 |
HIP 16510 |
17.31 |
| 2026-04-07 00:00 |
03:31:24.98 |
-23:31:54.1 |
HIP 16510 |
17.16 |
| 2026-04-07 12:00 |
03:31:25.89 |
-23:31:44.9 |
HIP 16510 |
17.02 |
| 2026-04-08 00:00 |
03:31:26.81 |
-23:31:35.7 |
HIP 16510 |
16.88 |
| 2026-04-08 12:00 |
03:31:27.73 |
-23:31:26.6 |
HIP 16510 |
16.74 |
| 2026-04-09 00:00 |
03:31:28.65 |
-23:31:17.5 |
HIP 16510 |
16.60 |
| 2026-04-09 12:00 |
03:31:29.59 |
-23:31:08.5 |
HIP 16510 |
16.46 |
| 2026-04-10 00:00 |
03:31:30.52 |
-23:30:59.6 |
HIP 16510 |
16.33 |
| 2026-04-10 12:00 |
03:31:31.47 |
-23:30:50.7 |
HIP 16510 |
16.19 |
| 2026-04-11 00:00 |
03:31:32.42 |
-23:30:41.9 |
HIP 16510 |
16.06 |
| 2026-04-11 12:00 |
03:31:33.37 |
-23:30:33.1 |
HIP 16510 |
15.93 |
| 2026-04-12 00:00 |
03:31:34.33 |
-23:30:24.4 |
HIP 16510 |
15.80 |
| 2026-04-12 12:00 |
03:31:35.30 |
-23:30:15.8 |
HIP 16510 |
15.67 |
| 2026-04-13 00:00 |
03:31:36.27 |
-23:30:07.2 |
HIP 16510 |
15.55 |
| 2026-04-13 12:00 |
03:31:37.25 |
-23:29:58.7 |
HIP 16510 |
15.42 |
| 2026-04-14 00:00 |
03:31:38.23 |
-23:29:50.3 |
HIP 16510 |
15.30 |
| 2026-04-14 12:00 |
03:31:39.21 |
-23:29:42.0 |
HIP 16510 |
15.18 |
| 2026-04-15 00:00 |
03:31:40.20 |
-23:29:33.7 |
HIP 16510 |
15.06 |
| 2026-04-15 12:00 |
03:31:41.20 |
-23:29:25.4 |
HIP 16510 |
14.95 |
| 2026-04-16 00:00 |
03:31:42.20 |
-23:29:17.3 |
HIP 16510 |
14.83 |