| Parameter |
Value |
| Designation |
C/1999 N2 (Lynn) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-07-23T01:12:49.584960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:01Z |
| Obs used |
203 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
7.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-08-07.0000000 |
| e |
0.99743788 |
| q (au) |
0.761284 |
| a (au) |
297.130861 |
| i (deg) |
111.655898 |
| Ω (om, deg) |
254.675893 |
| ω (w, deg) |
357.834196 |
| M (ma, deg) |
0.002877 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.119 + 3.568\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.119 |
| n |
3.568 |
| gf |
0.800 |
| gb |
-0.711 |
| k |
0.800 |
| δ90 |
1.362 |
| 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) |
| 2026-05-12 00:00 |
05:11:02.10 |
+37:25:46.7 |
HIP 24145 |
7.75 |
| 2026-05-12 12:00 |
05:11:04.70 |
+37:25:44.2 |
HIP 24145 |
7.65 |
| 2026-05-13 00:00 |
05:11:07.32 |
+37:25:41.8 |
HIP 24145 |
7.58 |
| 2026-05-13 12:00 |
05:11:09.95 |
+37:25:39.4 |
HIP 24145 |
7.55 |
| 2026-05-14 00:00 |
05:11:12.58 |
+37:25:37.1 |
HIP 24145 |
7.56 |
| 2026-05-14 12:00 |
05:11:15.23 |
+37:25:34.9 |
HIP 24145 |
7.61 |
| 2026-05-15 00:00 |
05:11:17.89 |
+37:25:32.8 |
HIP 24145 |
7.69 |
| 2026-05-15 12:00 |
05:11:20.56 |
+37:25:30.8 |
HIP 24145 |
7.81 |
| 2026-05-16 00:00 |
05:11:23.23 |
+37:25:28.8 |
HIP 24145 |
7.97 |
| 2026-05-16 12:00 |
05:11:25.92 |
+37:25:26.9 |
HIP 24145 |
8.16 |
| 2026-05-17 00:00 |
05:11:28.62 |
+37:25:25.1 |
HIP 24145 |
8.38 |
| 2026-05-17 12:00 |
05:11:31.32 |
+37:25:23.3 |
HIP 24145 |
8.63 |
| 2026-05-18 00:00 |
05:11:34.04 |
+37:25:21.7 |
HIP 24145 |
8.91 |
| 2026-05-18 12:00 |
05:11:36.77 |
+37:25:20.1 |
HIP 24145 |
9.21 |
| 2026-05-19 00:00 |
05:11:39.50 |
+37:25:18.6 |
HIP 24145 |
9.54 |
| 2026-05-19 12:00 |
05:11:42.24 |
+37:25:17.1 |
HIP 24145 |
9.89 |
| 2026-05-20 00:00 |
05:11:44.99 |
+37:25:15.8 |
HIP 24145 |
10.26 |
| 2026-05-20 12:00 |
05:11:47.75 |
+37:25:14.5 |
HIP 24145 |
10.64 |
| 2026-05-21 00:00 |
05:11:50.52 |
+37:25:13.3 |
HIP 24145 |
11.05 |
| 2026-05-21 12:00 |
05:11:53.29 |
+37:25:12.1 |
HIP 24145 |
11.46 |
| 2026-05-22 00:00 |
05:11:56.07 |
+37:25:11.1 |
HIP 24145 |
11.89 |
| 2026-05-22 12:00 |
05:11:58.86 |
+37:25:10.1 |
HIP 24145 |
12.33 |
| 2026-05-23 00:00 |
05:12:01.66 |
+37:25:09.2 |
HIP 24145 |
12.78 |
| 2026-05-23 12:00 |
05:12:04.46 |
+37:25:08.3 |
HIP 24145 |
13.24 |
| 2026-05-24 00:00 |
05:12:07.27 |
+37:25:07.6 |
HIP 24145 |
13.71 |
| 2026-05-24 12:00 |
05:12:10.08 |
+37:25:06.9 |
HIP 24145 |
14.19 |
| 2026-05-25 00:00 |
05:12:12.91 |
+37:25:06.3 |
HIP 24332 |
13.73 |
| 2026-05-25 12:00 |
05:12:15.74 |
+37:25:05.7 |
HIP 24332 |
13.20 |
| 2026-05-26 00:00 |
05:12:18.57 |
+37:25:05.3 |
HIP 24332 |
12.67 |
| 2026-05-26 12:00 |
05:12:21.41 |
+37:25:04.9 |
HIP 24332 |
12.15 |
| 2026-05-27 00:00 |
05:12:24.26 |
+37:25:04.5 |
HIP 24332 |
11.63 |
| 2026-05-27 12:00 |
05:12:27.11 |
+37:25:04.3 |
HIP 24332 |
11.12 |
| 2026-05-28 00:00 |
05:12:29.96 |
+37:25:04.1 |
HIP 24332 |
10.61 |
| 2026-05-28 12:00 |
05:12:32.82 |
+37:25:04.0 |
HIP 24332 |
10.10 |
| 2026-05-29 00:00 |
05:12:35.69 |
+37:25:04.0 |
HIP 24332 |
9.61 |
| 2026-05-29 12:00 |
05:12:38.56 |
+37:25:04.1 |
HIP 24332 |
9.12 |
| 2026-05-30 00:00 |
05:12:41.44 |
+37:25:04.2 |
HIP 24332 |
8.64 |
| 2026-05-30 12:00 |
05:12:44.32 |
+37:25:04.4 |
HIP 24332 |
8.17 |
| 2026-05-31 00:00 |
05:12:47.20 |
+37:25:04.7 |
HIP 24332 |
7.72 |
| 2026-05-31 12:00 |
05:12:50.09 |
+37:25:05.0 |
HIP 24332 |
7.28 |
| 2026-06-01 00:00 |
05:12:52.98 |
+37:25:05.4 |
HIP 24332 |
6.87 |
| 2026-06-01 12:00 |
05:12:55.87 |
+37:25:05.9 |
HIP 24332 |
6.48 |
| 2026-06-02 00:00 |
05:12:58.77 |
+37:25:06.5 |
HIP 24332 |
6.12 |