| Parameter |
Value |
| Designation |
493P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-01-26T12:27:24.261120Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:27Z |
| Obs used |
1386 |
| 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) |
2018-03-07.0000000 |
| e |
0.46281239 |
| q (au) |
3.822731 |
| a (au) |
7.116193 |
| i (deg) |
24.052948 |
| Ω (om, deg) |
1.355621 |
| ω (w, deg) |
83.556049 |
| M (ma, deg) |
210.340358 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.253 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.253 |
| 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 |
-3.722 |
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 |
06:48:14.17 |
+42:11:50.7 |
HIP 32493 |
18.01 |
| 2026-06-01 12:00 |
06:49:03.09 |
+42:09:47.8 |
HIP 32493 |
25.48 |
| 2026-06-02 00:00 |
06:49:52.02 |
+42:07:44.6 |
HIP 32844 |
23.14 |
| 2026-06-02 12:00 |
06:50:40.96 |
+42:05:41.0 |
HIP 32844 |
18.81 |
| 2026-06-03 00:00 |
06:51:29.90 |
+42:03:37.1 |
HIP 33050 |
17.89 |
| 2026-06-03 12:00 |
06:52:18.85 |
+42:01:32.8 |
HIP 33050 |
8.71 |
| 2026-06-04 00:00 |
06:53:07.80 |
+41:59:28.2 |
HIP 33050 |
2.30 |
| 2026-06-04 12:00 |
06:53:56.75 |
+41:57:23.3 |
HIP 33050 |
10.43 |
| 2026-06-05 00:00 |
06:54:45.70 |
+41:55:17.9 |
HIP 33304 |
12.14 |
| 2026-06-05 12:00 |
06:55:34.65 |
+41:53:12.3 |
HIP 33304 |
9.43 |
| 2026-06-06 00:00 |
06:56:23.61 |
+41:51:06.2 |
HIP 33433 |
10.82 |
| 2026-06-06 12:00 |
06:57:12.57 |
+41:48:59.8 |
HIP 33433 |
9.08 |
| 2026-06-07 00:00 |
06:58:01.52 |
+41:46:53.1 |
HIP 33507 |
4.76 |
| 2026-06-07 12:00 |
06:58:50.47 |
+41:44:46.0 |
HIP 33507 |
10.81 |
| 2026-06-08 00:00 |
06:59:39.43 |
+41:42:38.5 |
HIP 33507 |
19.68 |
| 2026-06-08 12:00 |
07:00:28.37 |
+41:40:30.7 |
HIP 33936 |
23.25 |
| 2026-06-09 00:00 |
07:01:17.32 |
+41:38:22.5 |
HIP 33936 |
13.99 |
| 2026-06-09 12:00 |
07:02:06.26 |
+41:36:14.0 |
HIP 33936 |
5.21 |
| 2026-06-10 00:00 |
07:02:55.20 |
+41:34:05.1 |
HIP 33936 |
5.91 |
| 2026-06-10 12:00 |
07:03:44.13 |
+41:31:55.8 |
HIP 34120 |
9.98 |
| 2026-06-11 00:00 |
07:04:33.05 |
+41:29:46.2 |
HIP 34120 |
7.28 |
| 2026-06-11 12:00 |
07:05:21.97 |
+41:27:36.2 |
HIP 34120 |
13.54 |
| 2026-06-12 00:00 |
07:06:10.88 |
+41:25:25.9 |
HIP 34315 |
10.25 |
| 2026-06-12 12:00 |
07:06:59.78 |
+41:23:15.2 |
HIP 34315 |
4.90 |
| 2026-06-13 00:00 |
07:07:48.67 |
+41:21:04.1 |
HIP 34403 |
5.80 |
| 2026-06-13 12:00 |
07:08:37.55 |
+41:18:52.7 |
HIP 34403 |
8.21 |
| 2026-06-14 00:00 |
07:09:26.42 |
+41:16:41.0 |
HIP 34403 |
16.72 |
| 2026-06-14 12:00 |
07:10:15.27 |
+41:14:28.8 |
HIP 34403 |
25.88 |
| 2026-06-15 00:00 |
07:11:04.12 |
+41:12:16.4 |
HIP 34743 |
26.31 |
| 2026-06-15 12:00 |
07:11:52.95 |
+41:10:03.5 |
HIP 34787 |
23.44 |
| 2026-06-16 00:00 |
07:12:41.76 |
+41:07:50.4 |
HIP 34988 |
19.18 |
| 2026-06-16 12:00 |
07:13:30.56 |
+41:05:36.8 |
HIP 34988 |
11.72 |
| 2026-06-17 00:00 |
07:14:19.34 |
+41:03:23.0 |
HIP 34988 |
9.23 |
| 2026-06-17 12:00 |
07:15:08.10 |
+41:01:08.8 |
HIP 34988 |
14.55 |
| 2026-06-18 00:00 |
07:15:56.85 |
+40:58:54.2 |
HIP 35314 |
19.71 |
| 2026-06-18 12:00 |
07:16:45.57 |
+40:56:39.3 |
HIP 35314 |
10.39 |
| 2026-06-19 00:00 |
07:17:34.28 |
+40:54:24.0 |
HIP 35314 |
2.60 |
| 2026-06-19 12:00 |
07:18:22.96 |
+40:52:08.4 |
HIP 35341 |
4.01 |
| 2026-06-20 00:00 |
07:19:11.62 |
+40:49:52.4 |
HIP 35527 |
10.83 |
| 2026-06-20 12:00 |
07:20:00.26 |
+40:47:36.2 |
HIP 35527 |
4.60 |
| 2026-06-21 00:00 |
07:20:48.88 |
+40:45:19.5 |
HIP 35527 |
10.25 |
| 2026-06-21 12:00 |
07:21:37.47 |
+40:43:02.5 |
HIP 35811 |
17.29 |
| 2026-06-22 00:00 |
07:22:26.03 |
+40:40:45.2 |
HIP 35811 |
8.15 |