| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
16:50:56.00 |
-10:25:18.1 |
HIP 82369 |
27.07 |
| 2026-06-03 00:00 |
16:50:37.71 |
-10:24:29.0 |
HIP 82369 |
25.36 |
| 2026-06-03 12:00 |
16:50:19.39 |
-10:23:40.7 |
HIP 82369 |
24.39 |
| 2026-06-04 00:00 |
16:50:01.07 |
-10:22:53.1 |
HIP 82369 |
24.24 |
| 2026-06-04 12:00 |
16:49:42.73 |
-10:22:06.2 |
HIP 82369 |
24.93 |
| 2026-06-05 00:00 |
16:49:24.38 |
-10:21:20.1 |
HIP 82369 |
26.39 |
| 2026-06-05 12:00 |
16:49:06.02 |
-10:20:34.7 |
HIP 82197 |
25.20 |
| 2026-06-06 00:00 |
16:48:47.67 |
-10:19:50.1 |
HIP 82197 |
21.59 |
| 2026-06-06 12:00 |
16:48:29.31 |
-10:19:06.3 |
HIP 82197 |
18.40 |
| 2026-06-07 00:00 |
16:48:10.96 |
-10:18:23.2 |
HIP 82197 |
15.90 |
| 2026-06-07 12:00 |
16:47:52.61 |
-10:17:40.9 |
HIP 82197 |
14.44 |
| 2026-06-08 00:00 |
16:47:34.28 |
-10:16:59.4 |
HIP 82197 |
14.33 |
| 2026-06-08 12:00 |
16:47:15.96 |
-10:16:18.7 |
HIP 82197 |
15.60 |
| 2026-06-09 00:00 |
16:46:57.66 |
-10:15:38.9 |
HIP 82197 |
17.96 |
| 2026-06-09 12:00 |
16:46:39.37 |
-10:14:59.8 |
HIP 82197 |
21.04 |
| 2026-06-10 00:00 |
16:46:21.11 |
-10:14:21.5 |
HIP 82197 |
24.56 |
| 2026-06-10 12:00 |
16:46:02.88 |
-10:13:44.1 |
HIP 82197 |
28.35 |
| 2026-06-11 00:00 |
16:45:44.68 |
-10:13:07.5 |
HIP 82197 |
32.33 |
| 2026-06-11 12:00 |
16:45:26.51 |
-10:12:31.8 |
HIP 82197 |
36.41 |
| 2026-06-12 00:00 |
16:45:08.38 |
-10:11:56.9 |
HIP 81869 |
33.07 |
| 2026-06-12 12:00 |
16:44:50.28 |
-10:11:22.8 |
HIP 81869 |
29.13 |
| 2026-06-13 00:00 |
16:44:32.24 |
-10:10:49.6 |
HIP 81869 |
25.40 |
| 2026-06-13 12:00 |
16:44:14.23 |
-10:10:17.3 |
HIP 81869 |
21.96 |
| 2026-06-14 00:00 |
16:43:56.28 |
-10:09:45.8 |
HIP 81869 |
18.98 |
| 2026-06-14 12:00 |
16:43:38.39 |
-10:09:15.3 |
HIP 81869 |
16.68 |
| 2026-06-15 00:00 |
16:43:20.55 |
-10:08:45.6 |
HIP 81869 |
15.36 |
| 2026-06-15 12:00 |
16:43:02.77 |
-10:08:16.7 |
HIP 81869 |
15.27 |
| 2026-06-16 00:00 |
16:42:45.06 |
-10:07:48.8 |
HIP 81869 |
16.41 |
| 2026-06-16 12:00 |
16:42:27.41 |
-10:07:21.8 |
HIP 81869 |
18.55 |
| 2026-06-17 00:00 |
16:42:09.83 |
-10:06:55.6 |
HIP 81869 |
21.37 |
| 2026-06-17 12:00 |
16:41:52.33 |
-10:06:30.4 |
HIP 81869 |
24.63 |
| 2026-06-18 00:00 |
16:41:34.91 |
-10:06:06.1 |
HIP 81869 |
28.18 |
| 2026-06-18 12:00 |
16:41:17.56 |
-10:05:42.7 |
HIP 81869 |
31.89 |
| 2026-06-19 00:00 |
16:41:00.30 |
-10:05:20.1 |
HIP 81869 |
35.73 |
| 2026-06-19 12:00 |
16:40:43.13 |
-10:04:58.5 |
HIP 81500 |
35.30 |
| 2026-06-20 00:00 |
16:40:26.04 |
-10:04:37.9 |
HIP 81500 |
32.29 |
| 2026-06-20 12:00 |
16:40:09.05 |
-10:04:18.1 |
HIP 81500 |
29.57 |
| 2026-06-21 00:00 |
16:39:52.15 |
-10:03:59.3 |
HIP 81500 |
27.24 |
| 2026-06-21 12:00 |
16:39:35.36 |
-10:03:41.3 |
HIP 81500 |
25.37 |
| 2026-06-22 00:00 |
16:39:18.66 |
-10:03:24.4 |
HIP 81500 |
24.07 |