| 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) |
| 2026-05-12 00:00 |
17:03:01.69 |
-11:10:02.3 |
HIP 83372 |
16.08 |
| 2026-05-12 12:00 |
17:02:47.06 |
-11:08:49.7 |
HIP 83372 |
13.15 |
| 2026-05-13 00:00 |
17:02:32.29 |
-11:07:37.5 |
HIP 83372 |
10.76 |
| 2026-05-13 12:00 |
17:02:17.38 |
-11:06:25.6 |
HIP 83372 |
9.39 |
| 2026-05-14 00:00 |
17:02:02.33 |
-11:05:14.1 |
HIP 83372 |
9.51 |
| 2026-05-14 12:00 |
17:01:47.14 |
-11:04:03.0 |
HIP 83372 |
11.12 |
| 2026-05-15 00:00 |
17:01:31.81 |
-11:02:52.3 |
HIP 83372 |
13.73 |
| 2026-05-15 12:00 |
17:01:16.35 |
-11:01:42.0 |
HIP 83233 |
10.47 |
| 2026-05-16 00:00 |
17:01:00.77 |
-11:00:32.1 |
HIP 83233 |
7.43 |
| 2026-05-16 12:00 |
17:00:45.05 |
-10:59:22.7 |
HIP 83233 |
5.71 |
| 2026-05-17 00:00 |
17:00:29.21 |
-10:58:13.6 |
HIP 83233 |
6.51 |
| 2026-05-17 12:00 |
17:00:13.24 |
-10:57:05.1 |
HIP 83233 |
9.24 |
| 2026-05-18 00:00 |
16:59:57.16 |
-10:55:56.9 |
HIP 83233 |
12.73 |
| 2026-05-18 12:00 |
16:59:40.96 |
-10:54:49.3 |
HIP 83233 |
16.52 |
| 2026-05-19 00:00 |
16:59:24.65 |
-10:53:42.1 |
HIP 83233 |
20.47 |
| 2026-05-19 12:00 |
16:59:08.23 |
-10:52:35.3 |
HIP 83048 |
24.15 |
| 2026-05-20 00:00 |
16:58:51.70 |
-10:51:29.1 |
HIP 83048 |
21.10 |
| 2026-05-20 12:00 |
16:58:35.06 |
-10:50:23.4 |
HIP 82979 |
18.50 |
| 2026-05-21 00:00 |
16:58:18.33 |
-10:49:18.2 |
HIP 82979 |
15.40 |
| 2026-05-21 12:00 |
16:58:01.50 |
-10:48:13.5 |
HIP 82979 |
12.94 |
| 2026-05-22 00:00 |
16:57:44.57 |
-10:47:09.3 |
HIP 82979 |
11.57 |
| 2026-05-22 12:00 |
16:57:27.55 |
-10:46:05.7 |
HIP 82979 |
11.70 |
| 2026-05-23 00:00 |
16:57:10.44 |
-10:45:02.6 |
HIP 82979 |
13.31 |
| 2026-05-23 12:00 |
16:56:53.25 |
-10:44:00.1 |
HIP 82921 |
13.26 |
| 2026-05-24 00:00 |
16:56:35.97 |
-10:42:58.1 |
HIP 82921 |
14.27 |
| 2026-05-24 12:00 |
16:56:18.61 |
-10:41:56.7 |
HIP 82921 |
16.42 |
| 2026-05-25 00:00 |
16:56:01.18 |
-10:40:55.9 |
HIP 82921 |
19.35 |
| 2026-05-25 12:00 |
16:55:43.67 |
-10:39:55.7 |
HIP 82921 |
22.75 |
| 2026-05-26 00:00 |
16:55:26.09 |
-10:38:56.1 |
HIP 82921 |
26.47 |
| 2026-05-26 12:00 |
16:55:08.45 |
-10:37:57.0 |
HIP 82642 |
24.31 |
| 2026-05-27 00:00 |
16:54:50.74 |
-10:36:58.6 |
HIP 82642 |
20.57 |
| 2026-05-27 12:00 |
16:54:32.97 |
-10:36:00.8 |
HIP 82642 |
17.16 |
| 2026-05-28 00:00 |
16:54:15.13 |
-10:35:03.6 |
HIP 82642 |
14.32 |
| 2026-05-28 12:00 |
16:53:57.25 |
-10:34:07.0 |
HIP 82642 |
12.47 |
| 2026-05-29 00:00 |
16:53:39.31 |
-10:33:11.1 |
HIP 82642 |
12.09 |
| 2026-05-29 12:00 |
16:53:21.32 |
-10:32:15.9 |
HIP 82642 |
13.31 |
| 2026-05-30 00:00 |
16:53:03.28 |
-10:31:21.3 |
HIP 82642 |
15.77 |
| 2026-05-30 12:00 |
16:52:45.21 |
-10:30:27.3 |
HIP 82642 |
19.00 |
| 2026-05-31 00:00 |
16:52:27.09 |
-10:29:34.1 |
HIP 82642 |
22.69 |
| 2026-05-31 12:00 |
16:52:08.93 |
-10:28:41.5 |
HIP 82642 |
26.64 |
| 2026-06-01 00:00 |
16:51:50.74 |
-10:27:49.6 |
HIP 82642 |
30.75 |
| 2026-06-01 12:00 |
16:51:32.52 |
-10:26:58.4 |
HIP 82369 |
32.17 |
| 2026-06-02 00:00 |
16:51:14.27 |
-10:26:07.9 |
HIP 82369 |
29.38 |