| Parameter |
Value |
| Designation |
493P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-01-26T11:37:46.035840Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:15Z |
| Obs used |
1391 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
14.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2005-09-30T09:07:51.744000Z |
| Discovery magnitude (MPC) |
19.10 N |
| Discovery observatory (MPC) |
699 · Lowell Observatory-LONEOS |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-03-21.0000000 |
| e |
0.46279882 |
| q (au) |
3.822893 |
| a (au) |
7.116316 |
| i (deg) |
24.052994 |
| Ω (om, deg) |
1.354612 |
| ω (w, deg) |
83.554180 |
| M (ma, deg) |
211.072889 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.250 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.250 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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 |
| 2024-08-02 |
2026-01-25 |
+6.1626 |
-3.719 |
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 |
09:38:31.58 |
+32:44:25.0 |
HIP 47223 |
16.85 |
| 2026-09-25 12:00 |
09:39:06.03 |
+32:42:12.2 |
HIP 47223 |
24.08 |
| 2026-09-26 00:00 |
09:39:40.35 |
+32:40:00.0 |
HIP 47483 |
24.24 |
| 2026-09-26 12:00 |
09:40:14.56 |
+32:37:48.4 |
HIP 47483 |
23.11 |
| 2026-09-27 00:00 |
09:40:48.65 |
+32:35:37.3 |
HIP 47483 |
24.35 |
| 2026-09-27 12:00 |
09:41:22.61 |
+32:33:26.9 |
HIP 47652 |
26.25 |
| 2026-09-28 00:00 |
09:41:56.45 |
+32:31:17.1 |
HIP 47652 |
19.75 |
| 2026-09-28 12:00 |
09:42:30.16 |
+32:29:07.9 |
HIP 47652 |
14.25 |
| 2026-09-29 00:00 |
09:43:03.76 |
+32:26:59.3 |
HIP 47714 |
7.74 |
| 2026-09-29 12:00 |
09:43:37.22 |
+32:24:51.4 |
HIP 47714 |
3.98 |
| 2026-09-30 00:00 |
09:44:10.56 |
+32:22:44.1 |
HIP 47714 |
8.95 |
| 2026-09-30 12:00 |
09:44:43.78 |
+32:20:37.4 |
HIP 47714 |
15.86 |
| 2026-10-01 00:00 |
09:45:16.87 |
+32:18:31.4 |
HIP 47955 |
18.85 |
| 2026-10-01 12:00 |
09:45:49.83 |
+32:16:26.1 |
HIP 47955 |
13.10 |
| 2026-10-02 00:00 |
09:46:22.66 |
+32:14:21.5 |
HIP 47955 |
9.69 |
| 2026-10-02 12:00 |
09:46:55.36 |
+32:12:17.5 |
HIP 47955 |
11.01 |
| 2026-10-03 00:00 |
09:47:27.94 |
+32:10:14.3 |
HIP 48082 |
9.27 |
| 2026-10-03 12:00 |
09:48:00.38 |
+32:08:11.7 |
HIP 48082 |
2.21 |
| 2026-10-04 00:00 |
09:48:32.69 |
+32:06:09.9 |
HIP 48082 |
5.12 |
| 2026-10-04 12:00 |
09:49:04.87 |
+32:04:08.8 |
HIP 48082 |
12.19 |
| 2026-10-05 00:00 |
09:49:36.92 |
+32:02:08.4 |
HIP 48082 |
19.27 |
| 2026-10-05 12:00 |
09:50:08.83 |
+32:00:08.7 |
HIP 48082 |
26.32 |
| 2026-10-06 00:00 |
09:50:40.61 |
+31:58:09.8 |
HIP 48082 |
33.34 |
| 2026-10-06 12:00 |
09:51:12.26 |
+31:56:11.6 |
HIP 48435 |
28.72 |
| 2026-10-07 00:00 |
09:51:43.76 |
+31:54:14.2 |
HIP 48435 |
23.72 |
| 2026-10-07 12:00 |
09:52:15.13 |
+31:52:17.6 |
HIP 48435 |
19.96 |
| 2026-10-08 00:00 |
09:52:46.37 |
+31:50:21.7 |
HIP 48435 |
18.19 |
| 2026-10-08 12:00 |
09:53:17.46 |
+31:48:26.6 |
HIP 48435 |
18.94 |
| 2026-10-09 00:00 |
09:53:48.41 |
+31:46:32.3 |
HIP 48435 |
21.93 |
| 2026-10-09 12:00 |
09:54:19.22 |
+31:44:38.9 |
HIP 48435 |
26.39 |
| 2026-10-10 00:00 |
09:54:49.89 |
+31:42:46.2 |
HIP 48740 |
21.36 |
| 2026-10-10 12:00 |
09:55:20.42 |
+31:40:54.3 |
HIP 48740 |
15.21 |
| 2026-10-11 00:00 |
09:55:50.80 |
+31:39:03.3 |
HIP 48740 |
9.88 |
| 2026-10-11 12:00 |
09:56:21.04 |
+31:37:13.1 |
HIP 48740 |
7.36 |
| 2026-10-12 00:00 |
09:56:51.14 |
+31:35:23.8 |
HIP 48740 |
9.99 |
| 2026-10-12 12:00 |
09:57:21.09 |
+31:33:35.3 |
HIP 48740 |
15.27 |
| 2026-10-13 00:00 |
09:57:50.89 |
+31:31:47.6 |
HIP 48740 |
21.28 |
| 2026-10-13 12:00 |
09:58:20.54 |
+31:30:00.8 |
HIP 48997 |
18.42 |
| 2026-10-14 00:00 |
09:58:50.05 |
+31:28:14.9 |
HIP 48997 |
12.05 |
| 2026-10-14 12:00 |
09:59:19.41 |
+31:26:29.8 |
HIP 48997 |
6.06 |
| 2026-10-15 00:00 |
09:59:48.61 |
+31:24:45.6 |
HIP 48997 |
3.54 |
| 2026-10-15 12:00 |
10:00:17.67 |
+31:23:02.3 |
HIP 48997 |
8.46 |
| 2026-10-16 00:00 |
10:00:46.57 |
+31:21:19.9 |
HIP 49088 |
12.64 |