| Parameter |
Value |
| Designation |
C/2007 N3 (Lulin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-01-10T15:21:20.111040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:10Z |
| Obs used |
3853 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
6.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-12-05.0000000 |
| e |
0.99998362 |
| q (au) |
1.212259 |
| a (au) |
74017.562220 |
| i (deg) |
178.373611 |
| Ω (om, deg) |
338.535163 |
| ω (w, deg) |
136.862191 |
| M (ma, deg) |
359.999998 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.207 + 3.193\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.207 |
| n |
3.193 |
| gf |
1.000 |
| gb |
-0.711 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2007-07-11 |
2007-11-01 |
+6.9416 |
-5.422 |
| 2007-11-01 |
2008-03-31 |
+15.1159 |
-11.353 |
| 2008-03-31 |
2008-08-20 |
-8.4186 |
+3.052 |
| 2008-08-20 |
2008-10-02 |
+13.2418 |
-5.726 |
| 2008-10-02 |
2009-01-10 |
+4.8131 |
-3.658 |
| 2009-01-10 |
2009-02-28 |
+40.2006 |
-6.492 |
| 2009-02-28 |
2011-01-01 |
+3.0849 |
-1.522 |
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 |
02:39:01.14 |
+13:59:30.3 |
HIP 12258 |
19.81 |
| 2026-03-26 12:00 |
02:39:03.50 |
+13:59:42.1 |
HIP 12258 |
20.22 |
| 2026-03-27 00:00 |
02:39:05.87 |
+13:59:54.0 |
HIP 12258 |
20.64 |
| 2026-03-27 12:00 |
02:39:08.26 |
+14:00:05.9 |
HIP 12258 |
21.07 |
| 2026-03-28 00:00 |
02:39:10.66 |
+14:00:17.9 |
HIP 12258 |
21.52 |
| 2026-03-28 12:00 |
02:39:13.08 |
+14:00:30.0 |
HIP 12258 |
21.98 |
| 2026-03-29 00:00 |
02:39:15.52 |
+14:00:42.1 |
HIP 12258 |
22.44 |
| 2026-03-29 12:00 |
02:39:17.96 |
+14:00:54.2 |
HIP 12258 |
22.92 |
| 2026-03-30 00:00 |
02:39:20.42 |
+14:01:06.4 |
HIP 12258 |
23.41 |
| 2026-03-30 12:00 |
02:39:22.90 |
+14:01:18.7 |
HIP 12258 |
23.91 |
| 2026-03-31 00:00 |
02:39:25.39 |
+14:01:31.0 |
HIP 12258 |
24.42 |
| 2026-03-31 12:00 |
02:39:27.89 |
+14:01:43.4 |
HIP 12258 |
24.93 |
| 2026-04-01 00:00 |
02:39:30.41 |
+14:01:55.8 |
HIP 12258 |
25.46 |
| 2026-04-01 12:00 |
02:39:32.94 |
+14:02:08.3 |
HIP 12258 |
25.99 |
| 2026-04-02 00:00 |
02:39:35.48 |
+14:02:20.8 |
HIP 12258 |
26.53 |
| 2026-04-02 12:00 |
02:39:38.03 |
+14:02:33.4 |
HIP 12258 |
27.08 |
| 2026-04-03 00:00 |
02:39:40.60 |
+14:02:46.0 |
HIP 12258 |
27.63 |
| 2026-04-03 12:00 |
02:39:43.18 |
+14:02:58.7 |
HIP 12258 |
28.19 |
| 2026-04-04 00:00 |
02:39:45.77 |
+14:03:11.4 |
HIP 12359 |
28.76 |
| 2026-04-04 12:00 |
02:39:48.38 |
+14:03:24.2 |
HIP 12359 |
28.77 |
| 2026-04-05 00:00 |
02:39:50.99 |
+14:03:37.0 |
HIP 12359 |
28.81 |
| 2026-04-05 12:00 |
02:39:53.62 |
+14:03:49.8 |
HIP 12359 |
28.85 |
| 2026-04-06 00:00 |
02:39:56.26 |
+14:04:02.7 |
HIP 12359 |
28.92 |
| 2026-04-06 12:00 |
02:39:58.91 |
+14:04:15.6 |
HIP 12359 |
29.00 |
| 2026-04-07 00:00 |
02:40:01.57 |
+14:04:28.6 |
HIP 12359 |
29.10 |
| 2026-04-07 12:00 |
02:40:04.24 |
+14:04:41.6 |
HIP 12359 |
29.21 |
| 2026-04-08 00:00 |
02:40:06.92 |
+14:04:54.6 |
HIP 12359 |
29.34 |
| 2026-04-08 12:00 |
02:40:09.62 |
+14:05:07.7 |
HIP 12359 |
29.48 |
| 2026-04-09 00:00 |
02:40:12.32 |
+14:05:20.8 |
HIP 12359 |
29.65 |
| 2026-04-09 12:00 |
02:40:15.04 |
+14:05:34.0 |
HIP 12359 |
29.82 |
| 2026-04-10 00:00 |
02:40:17.76 |
+14:05:47.1 |
HIP 12359 |
30.02 |
| 2026-04-10 12:00 |
02:40:20.49 |
+14:06:00.4 |
HIP 12359 |
30.23 |
| 2026-04-11 00:00 |
02:40:23.24 |
+14:06:13.6 |
HIP 12359 |
30.45 |
| 2026-04-11 12:00 |
02:40:25.99 |
+14:06:26.9 |
HIP 12359 |
30.69 |
| 2026-04-12 00:00 |
02:40:28.75 |
+14:06:40.2 |
HIP 12359 |
30.95 |
| 2026-04-12 12:00 |
02:40:31.52 |
+14:06:53.5 |
HIP 12359 |
31.22 |
| 2026-04-13 00:00 |
02:40:34.30 |
+14:07:06.9 |
HIP 12359 |
31.50 |
| 2026-04-13 12:00 |
02:40:37.09 |
+14:07:20.3 |
HIP 12359 |
31.80 |
| 2026-04-14 00:00 |
02:40:39.89 |
+14:07:33.7 |
HIP 12359 |
32.11 |
| 2026-04-14 12:00 |
02:40:42.69 |
+14:07:47.2 |
HIP 12359 |
32.44 |
| 2026-04-15 00:00 |
02:40:45.51 |
+14:08:00.7 |
HIP 12359 |
32.78 |
| 2026-04-15 12:00 |
02:40:48.33 |
+14:08:14.2 |
HIP 12359 |
33.14 |
| 2026-04-16 00:00 |
02:40:51.15 |
+14:08:27.7 |
HIP 12359 |
33.50 |