| Parameter |
Value |
| Designation |
292P/Li |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-02-06T08:53:58.968960Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:14:15Z |
| Obs used |
498 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
13.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-05-04.0000000 |
| e |
0.58678712 |
| q (au) |
2.535007 |
| a (au) |
6.134869 |
| i (deg) |
24.316162 |
| Ω (om, deg) |
91.860435 |
| ω (w, deg) |
318.847932 |
| M (ma, deg) |
247.179418 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.075 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.075 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
| 2013-05-09 |
2014-02-01 |
+14.5124 |
-5.970 |
| 2014-02-06 |
2018-04-23 |
-1.1227 |
+0.220 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
18:10:52.88 |
-28:20:07.8 |
HIP 89088 |
15.88 |
| 2026-09-25 12:00 |
18:10:58.50 |
-28:20:20.3 |
HIP 89088 |
16.07 |
| 2026-09-26 00:00 |
18:11:04.30 |
-28:20:32.6 |
HIP 89088 |
16.36 |
| 2026-09-26 12:00 |
18:11:10.27 |
-28:20:44.9 |
HIP 89088 |
16.75 |
| 2026-09-27 00:00 |
18:11:16.41 |
-28:20:57.1 |
HIP 89088 |
17.25 |
| 2026-09-27 12:00 |
18:11:22.73 |
-28:21:09.3 |
HIP 89088 |
17.84 |
| 2026-09-28 00:00 |
18:11:29.21 |
-28:21:21.3 |
HIP 89238 |
16.67 |
| 2026-09-28 12:00 |
18:11:35.87 |
-28:21:33.2 |
HIP 89238 |
15.45 |
| 2026-09-29 00:00 |
18:11:42.71 |
-28:21:45.1 |
HIP 89238 |
14.25 |
| 2026-09-29 12:00 |
18:11:49.71 |
-28:21:56.9 |
HIP 89238 |
13.09 |
| 2026-09-30 00:00 |
18:11:56.88 |
-28:22:08.6 |
HIP 89238 |
11.98 |
| 2026-09-30 12:00 |
18:12:04.22 |
-28:22:20.2 |
HIP 89238 |
10.97 |
| 2026-10-01 00:00 |
18:12:11.74 |
-28:22:31.7 |
HIP 89238 |
10.10 |
| 2026-10-01 12:00 |
18:12:19.42 |
-28:22:43.2 |
HIP 89238 |
9.43 |
| 2026-10-02 00:00 |
18:12:27.27 |
-28:22:54.6 |
HIP 89238 |
9.02 |
| 2026-10-02 12:00 |
18:12:35.29 |
-28:23:05.8 |
HIP 89238 |
8.93 |
| 2026-10-03 00:00 |
18:12:43.48 |
-28:23:17.1 |
HIP 89238 |
9.20 |
| 2026-10-03 12:00 |
18:12:51.83 |
-28:23:28.2 |
HIP 89238 |
9.81 |
| 2026-10-04 00:00 |
18:13:00.35 |
-28:23:39.2 |
HIP 89319 |
10.65 |
| 2026-10-04 12:00 |
18:13:09.04 |
-28:23:50.2 |
HIP 89319 |
9.74 |
| 2026-10-05 00:00 |
18:13:17.90 |
-28:24:01.0 |
HIP 89319 |
9.13 |
| 2026-10-05 12:00 |
18:13:26.92 |
-28:24:11.8 |
HIP 89319 |
8.92 |
| 2026-10-06 00:00 |
18:13:36.10 |
-28:24:22.5 |
HIP 89319 |
9.14 |
| 2026-10-06 12:00 |
18:13:45.46 |
-28:24:33.2 |
HIP 89319 |
9.81 |
| 2026-10-07 00:00 |
18:13:54.97 |
-28:24:43.7 |
HIP 89319 |
10.85 |
| 2026-10-07 12:00 |
18:14:04.65 |
-28:24:54.2 |
HIP 89319 |
12.19 |
| 2026-10-08 00:00 |
18:14:14.49 |
-28:25:04.6 |
HIP 89319 |
13.75 |
| 2026-10-08 12:00 |
18:14:24.49 |
-28:25:14.8 |
HIP 89319 |
15.49 |
| 2026-10-09 00:00 |
18:14:34.66 |
-28:25:25.1 |
HIP 89319 |
17.37 |
| 2026-10-09 12:00 |
18:14:44.99 |
-28:25:35.2 |
HIP 89356 |
18.42 |
| 2026-10-10 00:00 |
18:14:55.48 |
-28:25:45.2 |
HIP 89356 |
19.56 |
| 2026-10-10 12:00 |
18:15:06.12 |
-28:25:55.2 |
HIP 89356 |
20.91 |
| 2026-10-11 00:00 |
18:15:16.93 |
-28:26:05.1 |
HIP 89356 |
22.46 |
| 2026-10-11 12:00 |
18:15:27.89 |
-28:26:14.8 |
HIP 89356 |
24.16 |
| 2026-10-12 00:00 |
18:15:39.02 |
-28:26:24.6 |
HIP 89620 |
24.75 |
| 2026-10-12 12:00 |
18:15:50.30 |
-28:26:34.2 |
HIP 89620 |
22.53 |
| 2026-10-13 00:00 |
18:16:01.73 |
-28:26:43.7 |
HIP 89620 |
20.33 |
| 2026-10-13 12:00 |
18:16:13.33 |
-28:26:53.2 |
HIP 89620 |
18.19 |
| 2026-10-14 00:00 |
18:16:25.07 |
-28:27:02.5 |
HIP 89620 |
16.15 |
| 2026-10-14 12:00 |
18:16:36.97 |
-28:27:11.8 |
HIP 89620 |
14.25 |
| 2026-10-15 00:00 |
18:16:49.03 |
-28:27:21.0 |
HIP 89620 |
12.60 |
| 2026-10-15 12:00 |
18:17:01.23 |
-28:27:30.1 |
HIP 89620 |
11.32 |
| 2026-10-16 00:00 |
18:17:13.59 |
-28:27:39.1 |
HIP 89620 |
10.57 |