| 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) |
| 2026-03-26 00:00 |
14:51:10.42 |
-19:40:12.8 |
HIP 72501 |
27.94 |
| 2026-03-26 12:00 |
14:51:07.99 |
-19:40:04.9 |
HIP 72501 |
27.51 |
| 2026-03-27 00:00 |
14:51:05.53 |
-19:39:56.9 |
HIP 72501 |
27.09 |
| 2026-03-27 12:00 |
14:51:03.06 |
-19:39:48.8 |
HIP 72501 |
26.67 |
| 2026-03-28 00:00 |
14:51:00.57 |
-19:39:40.6 |
HIP 72501 |
26.25 |
| 2026-03-28 12:00 |
14:50:58.07 |
-19:39:32.3 |
HIP 72501 |
25.84 |
| 2026-03-29 00:00 |
14:50:55.55 |
-19:39:24.0 |
HIP 72501 |
25.44 |
| 2026-03-29 12:00 |
14:50:53.01 |
-19:39:15.5 |
HIP 72501 |
25.04 |
| 2026-03-30 00:00 |
14:50:50.46 |
-19:39:07.0 |
HIP 72501 |
24.65 |
| 2026-03-30 12:00 |
14:50:47.90 |
-19:38:58.4 |
HIP 72501 |
24.26 |
| 2026-03-31 00:00 |
14:50:45.32 |
-19:38:49.7 |
HIP 72501 |
23.89 |
| 2026-03-31 12:00 |
14:50:42.72 |
-19:38:40.9 |
HIP 72501 |
23.52 |
| 2026-04-01 00:00 |
14:50:40.11 |
-19:38:32.1 |
HIP 72501 |
23.16 |
| 2026-04-01 12:00 |
14:50:37.49 |
-19:38:23.1 |
HIP 72501 |
22.82 |
| 2026-04-02 00:00 |
14:50:34.85 |
-19:38:14.1 |
HIP 72501 |
22.48 |
| 2026-04-02 12:00 |
14:50:32.20 |
-19:38:05.0 |
HIP 72501 |
22.16 |
| 2026-04-03 00:00 |
14:50:29.53 |
-19:37:55.8 |
HIP 72501 |
21.84 |
| 2026-04-03 12:00 |
14:50:26.85 |
-19:37:46.5 |
HIP 72501 |
21.55 |
| 2026-04-04 00:00 |
14:50:24.16 |
-19:37:37.2 |
HIP 72501 |
21.26 |
| 2026-04-04 12:00 |
14:50:21.45 |
-19:37:27.8 |
HIP 72501 |
21.00 |
| 2026-04-05 00:00 |
14:50:18.73 |
-19:37:18.3 |
HIP 72501 |
20.75 |
| 2026-04-05 12:00 |
14:50:16.00 |
-19:37:08.7 |
HIP 72501 |
20.51 |
| 2026-04-06 00:00 |
14:50:13.25 |
-19:36:59.0 |
HIP 72501 |
20.30 |
| 2026-04-06 12:00 |
14:50:10.49 |
-19:36:49.3 |
HIP 72501 |
20.10 |
| 2026-04-07 00:00 |
14:50:07.72 |
-19:36:39.5 |
HIP 72501 |
19.93 |
| 2026-04-07 12:00 |
14:50:04.94 |
-19:36:29.6 |
HIP 72501 |
19.77 |
| 2026-04-08 00:00 |
14:50:02.14 |
-19:36:19.7 |
HIP 72501 |
19.64 |
| 2026-04-08 12:00 |
14:49:59.33 |
-19:36:09.6 |
HIP 72501 |
19.53 |
| 2026-04-09 00:00 |
14:49:56.52 |
-19:35:59.5 |
HIP 72501 |
19.45 |
| 2026-04-09 12:00 |
14:49:53.69 |
-19:35:49.3 |
HIP 72501 |
19.39 |
| 2026-04-10 00:00 |
14:49:50.84 |
-19:35:39.1 |
HIP 72501 |
19.35 |
| 2026-04-10 12:00 |
14:49:47.99 |
-19:35:28.8 |
HIP 72501 |
19.34 |
| 2026-04-11 00:00 |
14:49:45.13 |
-19:35:18.4 |
HIP 72501 |
19.35 |
| 2026-04-11 12:00 |
14:49:42.25 |
-19:35:08.0 |
HIP 72501 |
19.39 |
| 2026-04-12 00:00 |
14:49:39.37 |
-19:34:57.4 |
HIP 72501 |
19.45 |
| 2026-04-12 12:00 |
14:49:36.48 |
-19:34:46.8 |
HIP 72501 |
19.55 |
| 2026-04-13 00:00 |
14:49:33.57 |
-19:34:36.2 |
HIP 72501 |
19.66 |
| 2026-04-13 12:00 |
14:49:30.66 |
-19:34:25.5 |
HIP 72501 |
19.80 |
| 2026-04-14 00:00 |
14:49:27.73 |
-19:34:14.7 |
HIP 72501 |
19.97 |
| 2026-04-14 12:00 |
14:49:24.80 |
-19:34:03.8 |
HIP 72501 |
20.16 |
| 2026-04-15 00:00 |
14:49:21.86 |
-19:33:52.9 |
HIP 72501 |
20.38 |
| 2026-04-15 12:00 |
14:49:18.91 |
-19:33:42.0 |
HIP 72501 |
20.62 |
| 2026-04-16 00:00 |
14:49:15.95 |
-19:33:30.9 |
HIP 72501 |
20.88 |