| Parameter |
Value |
| Designation |
450P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2027-01-21T05:07:39.394560Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:26Z |
| Obs used |
963 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
11.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2004-01-13T06:33:13.248000Z |
| Discovery magnitude (MPC) |
18.40 N |
| Discovery observatory (MPC) |
699 · Lowell Observatory-LONEOS |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-01-25.0000000 |
| e |
0.31136698 |
| q (au) |
5.465121 |
| a (au) |
7.936188 |
| i (deg) |
10.559466 |
| Ω (om, deg) |
124.902793 |
| ω (w, deg) |
21.730541 |
| M (ma, deg) |
215.261080 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.085 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.085 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.939 |
| 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 |
| 2022-08-21 |
2026-04-09 |
+10.0246 |
-7.575 |
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 |
08:01:32.56 |
+20:55:09.8 |
HIP 39064 |
28.09 |
| 2026-06-01 12:00 |
08:01:55.38 |
+20:54:29.9 |
HIP 39260 |
27.83 |
| 2026-06-02 00:00 |
08:02:18.27 |
+20:53:49.6 |
HIP 39260 |
28.27 |
| 2026-06-02 12:00 |
08:02:41.24 |
+20:53:08.8 |
HIP 39503 |
26.00 |
| 2026-06-03 00:00 |
08:03:04.30 |
+20:52:27.5 |
HIP 39503 |
21.15 |
| 2026-06-03 12:00 |
08:03:27.43 |
+20:51:45.7 |
HIP 39503 |
16.63 |
| 2026-06-04 00:00 |
08:03:50.63 |
+20:51:03.5 |
HIP 39503 |
12.86 |
| 2026-06-04 12:00 |
08:04:13.92 |
+20:50:20.9 |
HIP 39503 |
10.67 |
| 2026-06-05 00:00 |
08:04:37.28 |
+20:49:37.8 |
HIP 39503 |
11.07 |
| 2026-06-05 12:00 |
08:05:00.71 |
+20:48:54.2 |
HIP 39624 |
11.35 |
| 2026-06-06 00:00 |
08:05:24.22 |
+20:48:10.1 |
HIP 39624 |
5.84 |
| 2026-06-06 12:00 |
08:05:47.81 |
+20:47:25.7 |
HIP 39624 |
0.86 |
| 2026-06-07 00:00 |
08:06:11.46 |
+20:46:40.7 |
HIP 39624 |
5.43 |
| 2026-06-07 12:00 |
08:06:35.19 |
+20:45:55.3 |
HIP 39711 |
9.75 |
| 2026-06-08 00:00 |
08:06:58.99 |
+20:45:09.4 |
HIP 39711 |
8.36 |
| 2026-06-08 12:00 |
08:07:22.87 |
+20:44:23.1 |
HIP 39711 |
10.40 |
| 2026-06-09 00:00 |
08:07:46.81 |
+20:43:36.3 |
HIP 39711 |
14.50 |
| 2026-06-09 12:00 |
08:08:10.82 |
+20:42:49.1 |
HIP 39711 |
19.42 |
| 2026-06-10 00:00 |
08:08:34.90 |
+20:42:01.4 |
HIP 39711 |
24.68 |
| 2026-06-10 12:00 |
08:08:59.05 |
+20:41:13.3 |
HIP 39826 |
27.30 |
| 2026-06-11 00:00 |
08:09:23.27 |
+20:40:24.7 |
HIP 40054 |
22.09 |
| 2026-06-11 12:00 |
08:09:47.55 |
+20:39:35.7 |
HIP 40054 |
17.05 |
| 2026-06-12 00:00 |
08:10:11.90 |
+20:38:46.2 |
HIP 40054 |
12.62 |
| 2026-06-12 12:00 |
08:10:36.32 |
+20:37:56.3 |
HIP 40054 |
9.70 |
| 2026-06-13 00:00 |
08:11:00.80 |
+20:37:05.9 |
HIP 40054 |
9.79 |
| 2026-06-13 12:00 |
08:11:25.34 |
+20:36:15.1 |
HIP 40054 |
12.83 |
| 2026-06-14 00:00 |
08:11:49.94 |
+20:35:23.8 |
HIP 40054 |
17.36 |
| 2026-06-14 12:00 |
08:12:14.61 |
+20:34:32.1 |
HIP 40054 |
22.51 |
| 2026-06-15 00:00 |
08:12:39.34 |
+20:33:39.9 |
HIP 40270 |
19.68 |
| 2026-06-15 12:00 |
08:13:04.13 |
+20:32:47.3 |
HIP 40270 |
16.55 |
| 2026-06-16 00:00 |
08:13:28.98 |
+20:31:54.3 |
HIP 40270 |
15.13 |
| 2026-06-16 12:00 |
08:13:53.89 |
+20:31:00.8 |
HIP 40361 |
13.83 |
| 2026-06-17 00:00 |
08:14:18.86 |
+20:30:06.9 |
HIP 40361 |
12.50 |
| 2026-06-17 12:00 |
08:14:43.88 |
+20:29:12.6 |
HIP 40399 |
12.25 |
| 2026-06-18 00:00 |
08:15:08.97 |
+20:28:17.8 |
HIP 40399 |
11.89 |
| 2026-06-18 12:00 |
08:15:34.10 |
+20:27:22.6 |
HIP 40399 |
14.26 |
| 2026-06-19 00:00 |
08:15:59.29 |
+20:26:27.0 |
HIP 40399 |
18.36 |
| 2026-06-19 12:00 |
08:16:24.54 |
+20:25:31.0 |
HIP 40471 |
20.94 |
| 2026-06-20 00:00 |
08:16:49.83 |
+20:24:34.5 |
HIP 40471 |
24.67 |
| 2026-06-20 12:00 |
08:17:15.18 |
+20:23:37.6 |
HIP 40471 |
29.18 |
| 2026-06-21 00:00 |
08:17:40.58 |
+20:22:40.3 |
HIP 40813 |
29.55 |
| 2026-06-21 12:00 |
08:18:06.03 |
+20:21:42.6 |
HIP 40813 |
23.53 |
| 2026-06-22 00:00 |
08:18:31.54 |
+20:20:44.4 |
HIP 40813 |
17.52 |