| Parameter |
Value |
| Designation |
37P/Forbes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-04T04:20:40.490880Z |
| Orbit solution date (soln_date, UTC) |
2025-11-23T22:22:59Z |
| Obs used |
1737 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
21.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-07-09.0000000 |
| e |
0.53418886 |
| q (au) |
1.610684 |
| a (au) |
3.457805 |
| i (deg) |
8.956078 |
| Ω (om, deg) |
314.577863 |
| ω (w, deg) |
330.024671 |
| M (ma, deg) |
66.038643 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.398 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.398 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2024-02-05 |
2024-10-07 |
+32.4582 |
-8.642 |
| 2024-10-07 |
2024-04-20 |
-1.5202 |
+0.726 |
| 2024-04-20 |
2025-01-05 |
+15.9337 |
-5.687 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:23:20.48 |
+28:19:00.5 |
HIP 20512 |
9.36 |
| 2026-06-01 12:00 |
04:23:53.95 |
+28:20:08.6 |
HIP 20512 |
9.22 |
| 2026-06-02 00:00 |
04:24:27.41 |
+28:21:16.3 |
HIP 20512 |
13.90 |
| 2026-06-02 12:00 |
04:25:00.85 |
+28:22:23.9 |
HIP 20512 |
20.31 |
| 2026-06-03 00:00 |
04:25:34.27 |
+28:23:31.1 |
HIP 20512 |
27.24 |
| 2026-06-03 12:00 |
04:26:07.67 |
+28:24:38.2 |
HIP 20512 |
34.38 |
| 2026-06-04 00:00 |
04:26:41.06 |
+28:25:44.9 |
HIP 20512 |
41.62 |
| 2026-06-04 12:00 |
04:27:14.42 |
+28:26:51.4 |
HIP 20864 |
42.39 |
| 2026-06-05 00:00 |
04:27:47.76 |
+28:27:57.7 |
HIP 21010 |
39.05 |
| 2026-06-05 12:00 |
04:28:21.07 |
+28:29:03.7 |
HIP 21010 |
33.65 |
| 2026-06-06 00:00 |
04:28:54.37 |
+28:30:09.4 |
HIP 21010 |
29.15 |
| 2026-06-06 12:00 |
04:29:27.64 |
+28:31:14.9 |
HIP 21010 |
26.03 |
| 2026-06-07 00:00 |
04:30:00.89 |
+28:32:20.1 |
HIP 21010 |
24.79 |
| 2026-06-07 12:00 |
04:30:34.12 |
+28:33:25.1 |
HIP 21010 |
25.70 |
| 2026-06-08 00:00 |
04:31:07.32 |
+28:34:29.8 |
HIP 21010 |
28.56 |
| 2026-06-08 12:00 |
04:31:40.49 |
+28:35:34.2 |
HIP 21159 |
26.23 |
| 2026-06-09 00:00 |
04:32:13.64 |
+28:36:38.4 |
HIP 21262 |
20.83 |
| 2026-06-09 12:00 |
04:32:46.77 |
+28:37:42.3 |
HIP 21262 |
13.72 |
| 2026-06-10 00:00 |
04:33:19.86 |
+28:38:46.0 |
HIP 21262 |
7.11 |
| 2026-06-10 12:00 |
04:33:52.93 |
+28:39:49.4 |
HIP 21262 |
4.53 |
| 2026-06-11 00:00 |
04:34:25.97 |
+28:40:52.5 |
HIP 21262 |
9.89 |
| 2026-06-11 12:00 |
04:34:58.98 |
+28:41:55.4 |
HIP 21323 |
16.41 |
| 2026-06-12 00:00 |
04:35:31.96 |
+28:42:58.0 |
HIP 21323 |
18.87 |
| 2026-06-12 12:00 |
04:36:04.91 |
+28:44:00.3 |
HIP 21323 |
23.43 |
| 2026-06-13 00:00 |
04:36:37.82 |
+28:45:02.4 |
HIP 21617 |
24.32 |
| 2026-06-13 12:00 |
04:37:10.71 |
+28:46:04.2 |
HIP 21617 |
17.30 |
| 2026-06-14 00:00 |
04:37:43.56 |
+28:47:05.7 |
HIP 21617 |
10.63 |
| 2026-06-14 12:00 |
04:38:16.37 |
+28:48:07.0 |
HIP 21617 |
5.70 |
| 2026-06-15 00:00 |
04:38:49.16 |
+28:49:08.0 |
HIP 21617 |
7.59 |
| 2026-06-15 12:00 |
04:39:21.90 |
+28:50:08.7 |
HIP 21707 |
4.83 |
| 2026-06-16 00:00 |
04:39:54.61 |
+28:51:09.1 |
HIP 21707 |
5.39 |
| 2026-06-16 12:00 |
04:40:27.28 |
+28:52:09.3 |
HIP 21707 |
11.80 |
| 2026-06-17 00:00 |
04:40:59.91 |
+28:53:09.3 |
HIP 21819 |
16.82 |
| 2026-06-17 12:00 |
04:41:32.51 |
+28:54:08.9 |
HIP 21845 |
14.90 |
| 2026-06-18 00:00 |
04:42:05.06 |
+28:55:08.3 |
HIP 21845 |
16.02 |
| 2026-06-18 12:00 |
04:42:37.57 |
+28:56:07.4 |
HIP 21845 |
19.86 |
| 2026-06-19 00:00 |
04:43:10.04 |
+28:57:06.2 |
HIP 21845 |
25.21 |
| 2026-06-19 12:00 |
04:43:42.47 |
+28:58:04.8 |
HIP 21845 |
31.28 |
| 2026-06-20 00:00 |
04:44:14.86 |
+28:59:03.1 |
HIP 22138 |
28.49 |
| 2026-06-20 12:00 |
04:44:47.20 |
+29:00:01.1 |
HIP 22138 |
24.59 |
| 2026-06-21 00:00 |
04:45:19.50 |
+29:00:58.9 |
HIP 22138 |
22.36 |
| 2026-06-21 12:00 |
04:45:51.75 |
+29:01:56.4 |
HIP 22138 |
22.30 |
| 2026-06-22 00:00 |
04:46:23.96 |
+29:02:53.6 |
HIP 22250 |
21.29 |