| 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) |
| 2026-03-26 00:00 |
07:46:28.63 |
+03:31:03.2 |
HIP 37912 |
11.27 |
| 2026-03-26 12:00 |
07:46:27.52 |
+03:31:16.9 |
HIP 37912 |
10.95 |
| 2026-03-27 00:00 |
07:46:26.42 |
+03:31:30.5 |
HIP 37912 |
10.63 |
| 2026-03-27 12:00 |
07:46:25.35 |
+03:31:44.1 |
HIP 37912 |
10.31 |
| 2026-03-28 00:00 |
07:46:24.30 |
+03:31:57.7 |
HIP 37912 |
10.01 |
| 2026-03-28 12:00 |
07:46:23.27 |
+03:32:11.3 |
HIP 37912 |
9.70 |
| 2026-03-29 00:00 |
07:46:22.27 |
+03:32:24.8 |
HIP 37912 |
9.40 |
| 2026-03-29 12:00 |
07:46:21.29 |
+03:32:38.2 |
HIP 37912 |
9.11 |
| 2026-03-30 00:00 |
07:46:20.32 |
+03:32:51.7 |
HIP 37912 |
8.82 |
| 2026-03-30 12:00 |
07:46:19.39 |
+03:33:05.1 |
HIP 37912 |
8.54 |
| 2026-03-31 00:00 |
07:46:18.47 |
+03:33:18.5 |
HIP 37912 |
8.26 |
| 2026-03-31 12:00 |
07:46:17.58 |
+03:33:31.8 |
HIP 37912 |
7.99 |
| 2026-04-01 00:00 |
07:46:16.71 |
+03:33:45.1 |
HIP 37912 |
7.72 |
| 2026-04-01 12:00 |
07:46:15.86 |
+03:33:58.4 |
HIP 37912 |
7.45 |
| 2026-04-02 00:00 |
07:46:15.03 |
+03:34:11.6 |
HIP 37912 |
7.20 |
| 2026-04-02 12:00 |
07:46:14.23 |
+03:34:24.8 |
HIP 37912 |
6.94 |
| 2026-04-03 00:00 |
07:46:13.45 |
+03:34:38.0 |
HIP 37912 |
6.70 |
| 2026-04-03 12:00 |
07:46:12.69 |
+03:34:51.1 |
HIP 37912 |
6.45 |
| 2026-04-04 00:00 |
07:46:11.95 |
+03:35:04.1 |
HIP 37912 |
6.22 |
| 2026-04-04 12:00 |
07:46:11.24 |
+03:35:17.2 |
HIP 37912 |
5.98 |
| 2026-04-05 00:00 |
07:46:10.55 |
+03:35:30.1 |
HIP 37912 |
5.76 |
| 2026-04-05 12:00 |
07:46:09.88 |
+03:35:43.1 |
HIP 37912 |
5.53 |
| 2026-04-06 00:00 |
07:46:09.23 |
+03:35:56.0 |
HIP 37912 |
5.32 |
| 2026-04-06 12:00 |
07:46:08.61 |
+03:36:08.8 |
HIP 37912 |
5.11 |
| 2026-04-07 00:00 |
07:46:08.01 |
+03:36:21.6 |
HIP 37912 |
4.90 |
| 2026-04-07 12:00 |
07:46:07.43 |
+03:36:34.3 |
HIP 37912 |
4.71 |
| 2026-04-08 00:00 |
07:46:06.87 |
+03:36:47.0 |
HIP 37912 |
4.51 |
| 2026-04-08 12:00 |
07:46:06.34 |
+03:36:59.7 |
HIP 37912 |
4.32 |
| 2026-04-09 00:00 |
07:46:05.83 |
+03:37:12.3 |
HIP 37912 |
4.14 |
| 2026-04-09 12:00 |
07:46:05.34 |
+03:37:24.8 |
HIP 37912 |
3.97 |
| 2026-04-10 00:00 |
07:46:04.88 |
+03:37:37.3 |
HIP 37912 |
3.80 |
| 2026-04-10 12:00 |
07:46:04.44 |
+03:37:49.7 |
HIP 37912 |
3.64 |
| 2026-04-11 00:00 |
07:46:04.02 |
+03:38:02.1 |
HIP 37912 |
3.49 |
| 2026-04-11 12:00 |
07:46:03.62 |
+03:38:14.4 |
HIP 37912 |
3.34 |
| 2026-04-12 00:00 |
07:46:03.25 |
+03:38:26.7 |
HIP 37912 |
3.20 |
| 2026-04-12 12:00 |
07:46:02.90 |
+03:38:38.9 |
HIP 37912 |
3.07 |
| 2026-04-13 00:00 |
07:46:02.57 |
+03:38:51.0 |
HIP 37912 |
2.94 |
| 2026-04-13 12:00 |
07:46:02.26 |
+03:39:03.1 |
HIP 37912 |
2.83 |
| 2026-04-14 00:00 |
07:46:01.98 |
+03:39:15.1 |
HIP 37912 |
2.72 |
| 2026-04-14 12:00 |
07:46:01.72 |
+03:39:27.1 |
HIP 37912 |
2.63 |
| 2026-04-15 00:00 |
07:46:01.48 |
+03:39:39.0 |
HIP 37912 |
2.54 |
| 2026-04-15 12:00 |
07:46:01.27 |
+03:39:50.9 |
HIP 37912 |
2.47 |
| 2026-04-16 00:00 |
07:46:01.08 |
+03:40:02.6 |
HIP 37912 |
2.40 |