C/2002 R3 (LONEOS)
| 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 |
0.964 |
| 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) |
| 2026-02-03 00:00 |
14:53:26.63 |
-19:44:37.1 |
HIP 72871 |
14.09 |
| 2026-02-03 12:00 |
14:53:26.53 |
-19:44:40.0 |
HIP 72871 |
14.05 |
| 2026-02-04 00:00 |
14:53:26.40 |
-19:44:42.8 |
HIP 72871 |
14.01 |
| 2026-02-04 12:00 |
14:53:26.25 |
-19:44:45.5 |
HIP 72871 |
13.98 |
| 2026-02-05 00:00 |
14:53:26.07 |
-19:44:48.1 |
HIP 72871 |
13.94 |
| 2026-02-05 12:00 |
14:53:25.87 |
-19:44:50.6 |
HIP 72871 |
13.91 |
| 2026-02-06 00:00 |
14:53:25.64 |
-19:44:53.0 |
HIP 72871 |
13.89 |
| 2026-02-06 12:00 |
14:53:25.38 |
-19:44:55.2 |
HIP 72871 |
13.87 |
| 2026-02-07 00:00 |
14:53:25.10 |
-19:44:57.4 |
HIP 72871 |
13.85 |
| 2026-02-07 12:00 |
14:53:24.80 |
-19:44:59.5 |
HIP 72871 |
13.83 |
| 2026-02-08 00:00 |
14:53:24.46 |
-19:45:01.4 |
HIP 72871 |
13.82 |
| 2026-02-08 12:00 |
14:53:24.11 |
-19:45:03.3 |
HIP 72871 |
13.82 |
| 2026-02-09 00:00 |
14:53:23.72 |
-19:45:05.0 |
HIP 72871 |
13.81 |
| 2026-02-09 12:00 |
14:53:23.31 |
-19:45:06.6 |
HIP 72871 |
13.82 |
| 2026-02-10 00:00 |
14:53:22.88 |
-19:45:08.1 |
HIP 72871 |
13.82 |
| 2026-02-10 12:00 |
14:53:22.42 |
-19:45:09.5 |
HIP 72871 |
13.83 |
| 2026-02-11 00:00 |
14:53:21.93 |
-19:45:10.8 |
HIP 72871 |
13.85 |
| 2026-02-11 12:00 |
14:53:21.42 |
-19:45:12.0 |
HIP 72871 |
13.86 |
| 2026-02-12 00:00 |
14:53:20.88 |
-19:45:13.0 |
HIP 72871 |
13.89 |
| 2026-02-12 12:00 |
14:53:20.32 |
-19:45:14.0 |
HIP 72871 |
13.92 |
| 2026-02-13 00:00 |
14:53:19.73 |
-19:45:14.8 |
HIP 72871 |
13.95 |
| 2026-02-13 12:00 |
14:53:19.11 |
-19:45:15.6 |
HIP 72871 |
13.99 |
| 2026-02-14 00:00 |
14:53:18.47 |
-19:45:16.2 |
HIP 72871 |
14.03 |
| 2026-02-14 12:00 |
14:53:17.80 |
-19:45:16.7 |
HIP 72871 |
14.08 |
| 2026-02-15 00:00 |
14:53:17.11 |
-19:45:17.1 |
HIP 72871 |
14.14 |
| 2026-02-15 12:00 |
14:53:16.39 |
-19:45:17.4 |
HIP 72871 |
14.20 |
| 2026-02-16 00:00 |
14:53:15.65 |
-19:45:17.5 |
HIP 72871 |
14.27 |
| 2026-02-16 12:00 |
14:53:14.88 |
-19:45:17.6 |
HIP 72871 |
14.34 |
| 2026-02-17 00:00 |
14:53:14.09 |
-19:45:17.5 |
HIP 72871 |
14.42 |
| 2026-02-17 12:00 |
14:53:13.27 |
-19:45:17.4 |
HIP 72871 |
14.50 |
| 2026-02-18 00:00 |
14:53:12.42 |
-19:45:17.1 |
HIP 72871 |
14.60 |
| 2026-02-18 12:00 |
14:53:11.55 |
-19:45:16.7 |
HIP 72871 |
14.69 |
| 2026-02-19 00:00 |
14:53:10.66 |
-19:45:16.2 |
HIP 72871 |
14.80 |
| 2026-02-19 12:00 |
14:53:09.74 |
-19:45:15.6 |
HIP 72871 |
14.91 |
| 2026-02-20 00:00 |
14:53:08.79 |
-19:45:14.9 |
HIP 72871 |
15.03 |
| 2026-02-20 12:00 |
14:53:07.82 |
-19:45:14.0 |
HIP 72871 |
15.15 |
| 2026-02-21 00:00 |
14:53:06.82 |
-19:45:13.1 |
HIP 72871 |
15.29 |
| 2026-02-21 12:00 |
14:53:05.80 |
-19:45:12.0 |
HIP 72871 |
15.43 |
| 2026-02-22 00:00 |
14:53:04.76 |
-19:45:10.9 |
HIP 72871 |
15.57 |
| 2026-02-22 12:00 |
14:53:03.68 |
-19:45:09.6 |
HIP 72871 |
15.73 |
| 2026-02-23 00:00 |
14:53:02.59 |
-19:45:08.2 |
HIP 72871 |
15.89 |
| 2026-02-23 12:00 |
14:53:01.47 |
-19:45:06.7 |
HIP 72871 |
16.06 |
| 2026-02-24 00:00 |
14:53:00.32 |
-19:45:05.1 |
HIP 72871 |
16.23 |