36P/Whipple
| Parameter |
Value |
| Designation |
36P/Whipple |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-01T11:32:39.073920Z |
| Orbit solution date (soln_date, UTC) |
2023-08-28T08:56:03Z |
| Obs used |
943 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-08-12.0000000 |
| e |
0.25822503 |
| q (au) |
3.089226 |
| a (au) |
4.164640 |
| i (deg) |
9.935343 |
| Ω (om, deg) |
182.391226 |
| ω (w, deg) |
201.955974 |
| M (ma, deg) |
216.491915 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.524 + 5.641\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.524 |
| n |
5.641 |
| gf |
1.000 |
| gb |
-0.683 |
| 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) |
| 2026-02-03 00:00 |
16:48:16.94 |
-14:20:51.9 |
HIP 82323 |
14.19 |
| 2026-02-03 12:00 |
16:48:38.28 |
-14:20:40.3 |
HIP 82323 |
9.09 |
| 2026-02-04 00:00 |
16:48:59.51 |
-14:20:28.0 |
HIP 82323 |
4.18 |
| 2026-02-04 12:00 |
16:49:20.63 |
-14:20:15.1 |
HIP 82323 |
2.29 |
| 2026-02-05 00:00 |
16:49:41.62 |
-14:20:01.5 |
HIP 82323 |
6.72 |
| 2026-02-05 12:00 |
16:50:02.50 |
-14:19:47.2 |
HIP 82323 |
11.67 |
| 2026-02-06 00:00 |
16:50:23.26 |
-14:19:32.2 |
HIP 82323 |
16.66 |
| 2026-02-06 12:00 |
16:50:43.91 |
-14:19:16.6 |
HIP 82323 |
21.65 |
| 2026-02-07 00:00 |
16:51:04.43 |
-14:19:00.3 |
HIP 82535 |
17.38 |
| 2026-02-07 12:00 |
16:51:24.82 |
-14:18:43.4 |
HIP 82535 |
12.63 |
| 2026-02-08 00:00 |
16:51:45.10 |
-14:18:25.8 |
HIP 82535 |
8.17 |
| 2026-02-08 12:00 |
16:52:05.25 |
-14:18:07.5 |
HIP 82535 |
4.73 |
| 2026-02-09 00:00 |
16:52:25.28 |
-14:17:48.5 |
HIP 82535 |
5.08 |
| 2026-02-09 12:00 |
16:52:45.18 |
-14:17:29.0 |
HIP 82535 |
8.73 |
| 2026-02-10 00:00 |
16:53:04.95 |
-14:17:08.7 |
HIP 82535 |
13.14 |
| 2026-02-10 12:00 |
16:53:24.59 |
-14:16:47.8 |
HIP 82701 |
13.63 |
| 2026-02-11 00:00 |
16:53:44.11 |
-14:16:26.2 |
HIP 82701 |
9.43 |
| 2026-02-11 12:00 |
16:54:03.49 |
-14:16:04.0 |
HIP 82701 |
6.13 |
| 2026-02-12 00:00 |
16:54:22.74 |
-14:15:41.1 |
HIP 82701 |
5.53 |
| 2026-02-12 12:00 |
16:54:41.86 |
-14:15:17.6 |
HIP 82701 |
8.19 |
| 2026-02-13 00:00 |
16:55:00.84 |
-14:14:53.4 |
HIP 82701 |
12.10 |
| 2026-02-13 12:00 |
16:55:19.69 |
-14:14:28.6 |
HIP 82701 |
16.35 |
| 2026-02-14 00:00 |
16:55:38.40 |
-14:14:03.1 |
HIP 82701 |
20.72 |
| 2026-02-14 12:00 |
16:55:56.97 |
-14:13:37.0 |
HIP 82701 |
25.12 |
| 2026-02-15 00:00 |
16:56:15.40 |
-14:13:10.2 |
HIP 83045 |
29.13 |
| 2026-02-15 12:00 |
16:56:33.69 |
-14:12:42.8 |
HIP 83045 |
25.13 |
| 2026-02-16 00:00 |
16:56:51.84 |
-14:12:14.7 |
HIP 83045 |
21.36 |
| 2026-02-16 12:00 |
16:57:09.85 |
-14:11:46.1 |
HIP 83045 |
17.91 |
| 2026-02-17 00:00 |
16:57:27.72 |
-14:11:16.7 |
HIP 83045 |
15.00 |
| 2026-02-17 12:00 |
16:57:45.44 |
-14:10:46.8 |
HIP 83045 |
12.96 |
| 2026-02-18 00:00 |
16:58:03.01 |
-14:10:16.2 |
HIP 83045 |
12.18 |
| 2026-02-18 12:00 |
16:58:20.44 |
-14:09:45.0 |
HIP 83045 |
12.87 |
| 2026-02-19 00:00 |
16:58:37.72 |
-14:09:13.1 |
HIP 83045 |
14.80 |
| 2026-02-19 12:00 |
16:58:54.85 |
-14:08:40.7 |
HIP 83045 |
17.54 |
| 2026-02-20 00:00 |
16:59:11.83 |
-14:08:07.6 |
HIP 83045 |
20.74 |
| 2026-02-20 12:00 |
16:59:28.65 |
-14:07:33.9 |
HIP 83045 |
24.21 |
| 2026-02-21 00:00 |
16:59:45.33 |
-14:06:59.6 |
HIP 83045 |
27.84 |
| 2026-02-21 12:00 |
17:00:01.85 |
-14:06:24.7 |
HIP 83045 |
31.54 |
| 2026-02-22 00:00 |
17:00:18.22 |
-14:05:49.1 |
HIP 83276 |
34.30 |
| 2026-02-22 12:00 |
17:00:34.43 |
-14:05:13.0 |
HIP 83276 |
32.46 |
| 2026-02-23 00:00 |
17:00:50.49 |
-14:04:36.2 |
HIP 83276 |
31.02 |
| 2026-02-23 12:00 |
17:01:06.39 |
-14:03:58.9 |
HIP 83276 |
30.02 |
| 2026-02-24 00:00 |
17:01:22.13 |
-14:03:20.9 |
HIP 83276 |
29.50 |