| Parameter |
Value |
| Designation |
C/1999 N4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-05-23T17:39:49.492800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:01Z |
| Obs used |
325 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-05-14.0000000 |
| e |
1.00420028 |
| q (au) |
5.504749 |
| a (au) |
-1310.567768 |
| i (deg) |
156.922895 |
| Ω (om, deg) |
345.901167 |
| ω (w, deg) |
90.429036 |
| M (ma, deg) |
-0.000202 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.577 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.577 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 1998-08-27 |
2000-05-22 |
-0.2602 |
+0.449 |
| 2000-05-29 |
2002-05-06 |
+11.7020 |
-9.733 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:47:12.40 |
+03:52:02.0 |
HIP 37942 |
18.30 |
| 2026-06-01 12:00 |
07:47:14.02 |
+03:52:05.2 |
HIP 37942 |
18.47 |
| 2026-06-02 00:00 |
07:47:15.64 |
+03:52:08.2 |
HIP 37942 |
18.64 |
| 2026-06-02 12:00 |
07:47:17.29 |
+03:52:11.2 |
HIP 37942 |
18.82 |
| 2026-06-03 00:00 |
07:47:18.94 |
+03:52:14.0 |
HIP 37942 |
19.02 |
| 2026-06-03 12:00 |
07:47:20.61 |
+03:52:16.7 |
HIP 37942 |
19.22 |
| 2026-06-04 00:00 |
07:47:22.30 |
+03:52:19.3 |
HIP 37942 |
19.44 |
| 2026-06-04 12:00 |
07:47:24.00 |
+03:52:21.8 |
HIP 37942 |
19.66 |
| 2026-06-05 00:00 |
07:47:25.71 |
+03:52:24.2 |
HIP 37942 |
19.90 |
| 2026-06-05 12:00 |
07:47:27.44 |
+03:52:26.5 |
HIP 37942 |
20.14 |
| 2026-06-06 00:00 |
07:47:29.17 |
+03:52:28.6 |
HIP 37942 |
20.40 |
| 2026-06-06 12:00 |
07:47:30.93 |
+03:52:30.7 |
HIP 37942 |
20.66 |
| 2026-06-07 00:00 |
07:47:32.69 |
+03:52:32.6 |
HIP 37942 |
20.94 |
| 2026-06-07 12:00 |
07:47:34.47 |
+03:52:34.4 |
HIP 37942 |
21.22 |
| 2026-06-08 00:00 |
07:47:36.26 |
+03:52:36.1 |
HIP 37942 |
21.51 |
| 2026-06-08 12:00 |
07:47:38.07 |
+03:52:37.8 |
HIP 37942 |
21.81 |
| 2026-06-09 00:00 |
07:47:39.89 |
+03:52:39.2 |
HIP 37942 |
22.12 |
| 2026-06-09 12:00 |
07:47:41.72 |
+03:52:40.6 |
HIP 37942 |
22.44 |
| 2026-06-10 00:00 |
07:47:43.56 |
+03:52:41.9 |
HIP 37942 |
22.77 |
| 2026-06-10 12:00 |
07:47:45.41 |
+03:52:43.0 |
HIP 37942 |
23.10 |
| 2026-06-11 00:00 |
07:47:47.28 |
+03:52:44.1 |
HIP 37942 |
23.45 |
| 2026-06-11 12:00 |
07:47:49.16 |
+03:52:45.0 |
HIP 37942 |
23.80 |
| 2026-06-12 00:00 |
07:47:51.05 |
+03:52:45.8 |
HIP 37942 |
24.16 |
| 2026-06-12 12:00 |
07:47:52.95 |
+03:52:46.5 |
HIP 37942 |
24.52 |
| 2026-06-13 00:00 |
07:47:54.86 |
+03:52:47.1 |
HIP 37942 |
24.89 |
| 2026-06-13 12:00 |
07:47:56.79 |
+03:52:47.6 |
HIP 37942 |
25.27 |
| 2026-06-14 00:00 |
07:47:58.72 |
+03:52:48.0 |
HIP 37942 |
25.66 |
| 2026-06-14 12:00 |
07:48:00.67 |
+03:52:48.2 |
HIP 37942 |
26.05 |
| 2026-06-15 00:00 |
07:48:02.63 |
+03:52:48.4 |
HIP 37942 |
26.45 |
| 2026-06-15 12:00 |
07:48:04.60 |
+03:52:48.4 |
HIP 37942 |
26.85 |
| 2026-06-16 00:00 |
07:48:06.58 |
+03:52:48.3 |
HIP 37942 |
27.27 |
| 2026-06-16 12:00 |
07:48:08.57 |
+03:52:48.1 |
HIP 37942 |
27.68 |
| 2026-06-17 00:00 |
07:48:10.56 |
+03:52:47.8 |
HIP 37942 |
28.11 |
| 2026-06-17 12:00 |
07:48:12.57 |
+03:52:47.4 |
HIP 37942 |
28.53 |
| 2026-06-18 00:00 |
07:48:14.59 |
+03:52:46.9 |
HIP 37942 |
28.97 |
| 2026-06-18 12:00 |
07:48:16.62 |
+03:52:46.2 |
HIP 38140 |
29.23 |
| 2026-06-19 00:00 |
07:48:18.66 |
+03:52:45.5 |
HIP 38140 |
29.06 |
| 2026-06-19 12:00 |
07:48:20.71 |
+03:52:44.6 |
HIP 38140 |
28.90 |
| 2026-06-20 00:00 |
07:48:22.77 |
+03:52:43.6 |
HIP 38140 |
28.75 |
| 2026-06-20 12:00 |
07:48:24.83 |
+03:52:42.5 |
HIP 38140 |
28.61 |
| 2026-06-21 00:00 |
07:48:26.91 |
+03:52:41.3 |
HIP 38140 |
28.48 |
| 2026-06-21 12:00 |
07:48:28.99 |
+03:52:40.0 |
HIP 38140 |
28.36 |
| 2026-06-22 00:00 |
07:48:31.09 |
+03:52:38.6 |
HIP 38140 |
28.25 |