C/2001 N2 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
06:36:14.15 |
-11:03:55.5 |
HIP 31510 |
19.17 |
| 2026-02-03 12:00 |
06:36:11.71 |
-11:03:38.9 |
HIP 31510 |
19.29 |
| 2026-02-04 00:00 |
06:36:09.28 |
-11:03:22.1 |
HIP 31510 |
19.44 |
| 2026-02-04 12:00 |
06:36:06.87 |
-11:03:05.2 |
HIP 31510 |
19.62 |
| 2026-02-05 00:00 |
06:36:04.47 |
-11:02:48.2 |
HIP 31510 |
19.82 |
| 2026-02-05 12:00 |
06:36:02.09 |
-11:02:31.0 |
HIP 31510 |
20.03 |
| 2026-02-06 00:00 |
06:35:59.72 |
-11:02:13.6 |
HIP 31510 |
20.28 |
| 2026-02-06 12:00 |
06:35:57.37 |
-11:01:56.1 |
HIP 31510 |
20.54 |
| 2026-02-07 00:00 |
06:35:55.04 |
-11:01:38.5 |
HIP 31510 |
20.82 |
| 2026-02-07 12:00 |
06:35:52.72 |
-11:01:20.7 |
HIP 31510 |
21.11 |
| 2026-02-08 00:00 |
06:35:50.42 |
-11:01:02.8 |
HIP 31510 |
21.43 |
| 2026-02-08 12:00 |
06:35:48.14 |
-11:00:44.7 |
HIP 31510 |
21.76 |
| 2026-02-09 00:00 |
06:35:45.87 |
-11:00:26.5 |
HIP 31510 |
22.11 |
| 2026-02-09 12:00 |
06:35:43.62 |
-11:00:08.1 |
HIP 31356 |
22.24 |
| 2026-02-10 00:00 |
06:35:41.39 |
-10:59:49.7 |
HIP 31356 |
22.01 |
| 2026-02-10 12:00 |
06:35:39.17 |
-10:59:31.1 |
HIP 31332 |
21.55 |
| 2026-02-11 00:00 |
06:35:36.98 |
-10:59:12.3 |
HIP 31332 |
20.98 |
| 2026-02-11 12:00 |
06:35:34.80 |
-10:58:53.4 |
HIP 31332 |
20.43 |
| 2026-02-12 00:00 |
06:35:32.64 |
-10:58:34.4 |
HIP 31332 |
19.88 |
| 2026-02-12 12:00 |
06:35:30.49 |
-10:58:15.3 |
HIP 31332 |
19.34 |
| 2026-02-13 00:00 |
06:35:28.37 |
-10:57:56.0 |
HIP 31332 |
18.81 |
| 2026-02-13 12:00 |
06:35:26.26 |
-10:57:36.6 |
HIP 31332 |
18.28 |
| 2026-02-14 00:00 |
06:35:24.17 |
-10:57:17.1 |
HIP 31332 |
17.77 |
| 2026-02-14 12:00 |
06:35:22.10 |
-10:56:57.5 |
HIP 31332 |
17.27 |
| 2026-02-15 00:00 |
06:35:20.05 |
-10:56:37.7 |
HIP 31332 |
16.78 |
| 2026-02-15 12:00 |
06:35:18.02 |
-10:56:17.9 |
HIP 31332 |
16.30 |
| 2026-02-16 00:00 |
06:35:16.01 |
-10:55:57.9 |
HIP 31332 |
15.84 |
| 2026-02-16 12:00 |
06:35:14.01 |
-10:55:37.8 |
HIP 31332 |
15.39 |
| 2026-02-17 00:00 |
06:35:12.04 |
-10:55:17.6 |
HIP 31332 |
14.95 |
| 2026-02-17 12:00 |
06:35:10.08 |
-10:54:57.2 |
HIP 31332 |
14.53 |
| 2026-02-18 00:00 |
06:35:08.15 |
-10:54:36.8 |
HIP 31332 |
14.13 |
| 2026-02-18 12:00 |
06:35:06.23 |
-10:54:16.2 |
HIP 31332 |
13.74 |
| 2026-02-19 00:00 |
06:35:04.34 |
-10:53:55.6 |
HIP 31332 |
13.38 |
| 2026-02-19 12:00 |
06:35:02.47 |
-10:53:34.8 |
HIP 31332 |
13.03 |
| 2026-02-20 00:00 |
06:35:00.61 |
-10:53:13.9 |
HIP 31332 |
12.71 |
| 2026-02-20 12:00 |
06:34:58.78 |
-10:52:53.0 |
HIP 31332 |
12.41 |
| 2026-02-21 00:00 |
06:34:56.97 |
-10:52:31.9 |
HIP 31332 |
12.14 |
| 2026-02-21 12:00 |
06:34:55.17 |
-10:52:10.7 |
HIP 31332 |
11.89 |
| 2026-02-22 00:00 |
06:34:53.40 |
-10:51:49.5 |
HIP 31332 |
11.67 |
| 2026-02-22 12:00 |
06:34:51.65 |
-10:51:28.1 |
HIP 31332 |
11.47 |
| 2026-02-23 00:00 |
06:34:49.92 |
-10:51:06.7 |
HIP 31332 |
11.31 |
| 2026-02-23 12:00 |
06:34:48.21 |
-10:50:45.1 |
HIP 31332 |
11.18 |
| 2026-02-24 00:00 |
06:34:46.53 |
-10:50:23.5 |
HIP 31332 |
11.08 |