| Parameter |
Value |
| Designation |
C/2001 N2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-08-19T15:57:25.813440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:10Z |
| Obs used |
884 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-03-18.0000000 |
| e |
1.00105829 |
| q (au) |
2.668513 |
| a (au) |
-2521.533796 |
| i (deg) |
138.543532 |
| Ω (om, deg) |
52.803642 |
| ω (w, deg) |
151.896075 |
| M (ma, deg) |
-0.001204 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.423 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.423 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2001-07-11 |
2002-03-19 |
+6.0608 |
-3.799 |
| 2002-03-19 |
2002-08-17 |
-14.8317 |
+6.318 |
| 2002-08-19 |
2003-06-08 |
+6.3253 |
-2.392 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:33:46.70 |
-10:27:08.8 |
HIP 31456 |
25.22 |
| 2026-03-26 12:00 |
06:33:46.42 |
-10:26:45.1 |
HIP 31456 |
25.41 |
| 2026-03-27 00:00 |
06:33:46.17 |
-10:26:21.4 |
HIP 31456 |
25.60 |
| 2026-03-27 12:00 |
06:33:45.94 |
-10:25:57.6 |
HIP 31456 |
25.79 |
| 2026-03-28 00:00 |
06:33:45.73 |
-10:25:34.0 |
HIP 31456 |
25.98 |
| 2026-03-28 12:00 |
06:33:45.55 |
-10:25:10.3 |
HIP 31456 |
26.17 |
| 2026-03-29 00:00 |
06:33:45.40 |
-10:24:46.6 |
HIP 31456 |
26.35 |
| 2026-03-29 12:00 |
06:33:45.26 |
-10:24:23.0 |
HIP 31456 |
26.54 |
| 2026-03-30 00:00 |
06:33:45.15 |
-10:23:59.5 |
HIP 31456 |
26.73 |
| 2026-03-30 12:00 |
06:33:45.06 |
-10:23:35.9 |
HIP 31456 |
26.91 |
| 2026-03-31 00:00 |
06:33:45.00 |
-10:23:12.4 |
HIP 31456 |
27.09 |
| 2026-03-31 12:00 |
06:33:44.96 |
-10:22:48.9 |
HIP 31456 |
27.28 |
| 2026-04-01 00:00 |
06:33:44.94 |
-10:22:25.5 |
HIP 31456 |
27.46 |
| 2026-04-01 12:00 |
06:33:44.95 |
-10:22:02.0 |
HIP 31456 |
27.64 |
| 2026-04-02 00:00 |
06:33:44.98 |
-10:21:38.7 |
HIP 31456 |
27.82 |
| 2026-04-02 12:00 |
06:33:45.04 |
-10:21:15.3 |
HIP 31456 |
28.00 |
| 2026-04-03 00:00 |
06:33:45.11 |
-10:20:52.1 |
HIP 31456 |
28.17 |
| 2026-04-03 12:00 |
06:33:45.22 |
-10:20:28.8 |
HIP 31456 |
28.35 |
| 2026-04-04 00:00 |
06:33:45.34 |
-10:20:05.6 |
HIP 31456 |
28.52 |
| 2026-04-04 12:00 |
06:33:45.49 |
-10:19:42.5 |
HIP 31456 |
28.70 |
| 2026-04-05 00:00 |
06:33:45.66 |
-10:19:19.3 |
HIP 31456 |
28.87 |
| 2026-04-05 12:00 |
06:33:45.85 |
-10:18:56.3 |
HIP 31456 |
29.04 |
| 2026-04-06 00:00 |
06:33:46.07 |
-10:18:33.3 |
HIP 31456 |
29.21 |
| 2026-04-06 12:00 |
06:33:46.31 |
-10:18:10.3 |
HIP 31456 |
29.38 |
| 2026-04-07 00:00 |
06:33:46.57 |
-10:17:47.4 |
HIP 31456 |
29.55 |
| 2026-04-07 12:00 |
06:33:46.86 |
-10:17:24.6 |
HIP 31456 |
29.72 |
| 2026-04-08 00:00 |
06:33:47.17 |
-10:17:01.8 |
HIP 31456 |
29.89 |
| 2026-04-08 12:00 |
06:33:47.50 |
-10:16:39.1 |
HIP 31456 |
30.05 |
| 2026-04-09 00:00 |
06:33:47.85 |
-10:16:16.4 |
HIP 31456 |
30.22 |
| 2026-04-09 12:00 |
06:33:48.23 |
-10:15:53.8 |
HIP 31456 |
30.38 |
| 2026-04-10 00:00 |
06:33:48.63 |
-10:15:31.2 |
HIP 31456 |
30.55 |
| 2026-04-10 12:00 |
06:33:49.06 |
-10:15:08.7 |
HIP 31456 |
30.71 |
| 2026-04-11 00:00 |
06:33:49.50 |
-10:14:46.3 |
HIP 31456 |
30.87 |
| 2026-04-11 12:00 |
06:33:49.97 |
-10:14:24.0 |
HIP 31456 |
31.03 |
| 2026-04-12 00:00 |
06:33:50.46 |
-10:14:01.7 |
HIP 31456 |
31.19 |
| 2026-04-12 12:00 |
06:33:50.98 |
-10:13:39.5 |
HIP 31456 |
31.35 |
| 2026-04-13 00:00 |
06:33:51.51 |
-10:13:17.3 |
HIP 31456 |
31.50 |
| 2026-04-13 12:00 |
06:33:52.07 |
-10:12:55.3 |
HIP 31456 |
31.66 |
| 2026-04-14 00:00 |
06:33:52.65 |
-10:12:33.3 |
HIP 31496 |
31.78 |
| 2026-04-14 12:00 |
06:33:53.26 |
-10:12:11.4 |
HIP 31496 |
31.82 |
| 2026-04-15 00:00 |
06:33:53.88 |
-10:11:49.5 |
HIP 31496 |
31.87 |
| 2026-04-15 12:00 |
06:33:54.53 |
-10:11:27.8 |
HIP 31496 |
31.91 |
| 2026-04-16 00:00 |
06:33:55.20 |
-10:11:06.1 |
HIP 31496 |
31.96 |