| Parameter |
Value |
| Designation |
C/2002 R3 (LONEOS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-06-13T11:35:43.209600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:20Z |
| Obs used |
1261 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
8.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-04-08.0000000 |
| e |
1.00261095 |
| q (au) |
3.869488 |
| a (au) |
-1482.020620 |
| i (deg) |
161.095162 |
| Ω (om, deg) |
54.295118 |
| ω (w, deg) |
45.068070 |
| M (ma, deg) |
-0.001149 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.252 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.252 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.696 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
14:41:12.71 |
-18:57:16.7 |
HIP 71776 |
10.05 |
| 2026-07-29 12:00 |
14:41:12.21 |
-18:57:13.0 |
HIP 71776 |
9.95 |
| 2026-07-30 00:00 |
14:41:11.73 |
-18:57:09.4 |
HIP 71776 |
9.86 |
| 2026-07-30 12:00 |
14:41:11.27 |
-18:57:05.9 |
HIP 71776 |
9.77 |
| 2026-07-31 00:00 |
14:41:10.84 |
-18:57:02.5 |
HIP 71776 |
9.68 |
| 2026-07-31 12:00 |
14:41:10.43 |
-18:56:59.2 |
HIP 71776 |
9.60 |
| 2026-08-01 00:00 |
14:41:10.05 |
-18:56:56.0 |
HIP 71776 |
9.52 |
| 2026-08-01 12:00 |
14:41:09.69 |
-18:56:52.9 |
HIP 71776 |
9.44 |
| 2026-08-02 00:00 |
14:41:09.35 |
-18:56:49.9 |
HIP 71776 |
9.37 |
| 2026-08-02 12:00 |
14:41:09.03 |
-18:56:47.1 |
HIP 71776 |
9.30 |
| 2026-08-03 00:00 |
14:41:08.74 |
-18:56:44.3 |
HIP 71776 |
9.24 |
| 2026-08-03 12:00 |
14:41:08.48 |
-18:56:41.6 |
HIP 71776 |
9.18 |
| 2026-08-04 00:00 |
14:41:08.23 |
-18:56:39.1 |
HIP 71776 |
9.12 |
| 2026-08-04 12:00 |
14:41:08.01 |
-18:56:36.6 |
HIP 71776 |
9.07 |
| 2026-08-05 00:00 |
14:41:07.82 |
-18:56:34.3 |
HIP 71776 |
9.02 |
| 2026-08-05 12:00 |
14:41:07.65 |
-18:56:32.1 |
HIP 71776 |
8.97 |
| 2026-08-06 00:00 |
14:41:07.50 |
-18:56:30.0 |
HIP 71776 |
8.93 |
| 2026-08-06 12:00 |
14:41:07.37 |
-18:56:27.9 |
HIP 71776 |
8.89 |
| 2026-08-07 00:00 |
14:41:07.27 |
-18:56:26.0 |
HIP 71776 |
8.85 |
| 2026-08-07 12:00 |
14:41:07.19 |
-18:56:24.2 |
HIP 71776 |
8.82 |
| 2026-08-08 00:00 |
14:41:07.14 |
-18:56:22.5 |
HIP 71776 |
8.79 |
| 2026-08-08 12:00 |
14:41:07.11 |
-18:56:21.0 |
HIP 71776 |
8.76 |
| 2026-08-09 00:00 |
14:41:07.11 |
-18:56:19.5 |
HIP 71776 |
8.73 |
| 2026-08-09 12:00 |
14:41:07.12 |
-18:56:18.1 |
HIP 71776 |
8.71 |
| 2026-08-10 00:00 |
14:41:07.16 |
-18:56:16.9 |
HIP 71776 |
8.70 |
| 2026-08-10 12:00 |
14:41:07.23 |
-18:56:15.7 |
HIP 71776 |
8.68 |
| 2026-08-11 00:00 |
14:41:07.32 |
-18:56:14.7 |
HIP 71776 |
8.67 |
| 2026-08-11 12:00 |
14:41:07.43 |
-18:56:13.7 |
HIP 71776 |
8.66 |
| 2026-08-12 00:00 |
14:41:07.57 |
-18:56:12.9 |
HIP 71776 |
8.66 |
| 2026-08-12 12:00 |
14:41:07.72 |
-18:56:12.2 |
HIP 71776 |
8.66 |
| 2026-08-13 00:00 |
14:41:07.91 |
-18:56:11.6 |
HIP 71776 |
8.66 |
| 2026-08-13 12:00 |
14:41:08.11 |
-18:56:11.1 |
HIP 71776 |
8.67 |
| 2026-08-14 00:00 |
14:41:08.34 |
-18:56:10.7 |
HIP 71776 |
8.67 |
| 2026-08-14 12:00 |
14:41:08.60 |
-18:56:10.5 |
HIP 71776 |
8.69 |
| 2026-08-15 00:00 |
14:41:08.87 |
-18:56:10.3 |
HIP 71776 |
8.71 |
| 2026-08-15 12:00 |
14:41:09.17 |
-18:56:10.2 |
HIP 71776 |
8.73 |
| 2026-08-16 00:00 |
14:41:09.50 |
-18:56:10.3 |
HIP 71776 |
8.75 |
| 2026-08-16 12:00 |
14:41:09.84 |
-18:56:10.5 |
HIP 71776 |
8.78 |
| 2026-08-17 00:00 |
14:41:10.21 |
-18:56:10.7 |
HIP 71776 |
8.81 |
| 2026-08-17 12:00 |
14:41:10.60 |
-18:56:11.1 |
HIP 71776 |
8.85 |
| 2026-08-18 00:00 |
14:41:11.02 |
-18:56:11.6 |
HIP 71776 |
8.89 |
| 2026-08-18 12:00 |
14:41:11.46 |
-18:56:12.2 |
HIP 71776 |
8.94 |
| 2026-08-19 00:00 |
14:41:11.92 |
-18:56:12.9 |
HIP 71776 |
8.99 |