| Parameter |
Value |
| Designation |
C/1999 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-03-24T01:09:17.948160Z |
| Orbit solution date (soln_date, UTC) |
2022-04-30T03:12:26Z |
| Obs used |
833 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
8.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-09-17.0000000 |
| e |
1.00085745 |
| q (au) |
3.091379 |
| a (au) |
-3605.302714 |
| i (deg) |
134.795873 |
| Ω (om, deg) |
188.877122 |
| ω (w, deg) |
184.264817 |
| M (ma, deg) |
-0.000856 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.335 + 5.484\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.335 |
| n |
5.484 |
| gf |
1.000 |
| gb |
-0.641 |
| 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 |
| 1999-10-29 |
2000-02-28 |
+21.2209 |
-14.967 |
| 2000-02-28 |
2001-02-21 |
-6.9073 |
+3.809 |
| 2001-05-31 |
2003-07-19 |
-4.9693 |
+2.340 |
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 |
13:10:24.17 |
-27:26:46.3 |
HIP 64193 |
21.95 |
| 2026-06-01 12:00 |
13:10:22.39 |
-27:26:25.1 |
HIP 64193 |
21.97 |
| 2026-06-02 00:00 |
13:10:20.63 |
-27:26:04.0 |
HIP 64193 |
22.02 |
| 2026-06-02 12:00 |
13:10:18.89 |
-27:25:42.9 |
HIP 64193 |
22.07 |
| 2026-06-03 00:00 |
13:10:17.17 |
-27:25:21.8 |
HIP 64193 |
22.14 |
| 2026-06-03 12:00 |
13:10:15.47 |
-27:25:00.7 |
HIP 64193 |
22.23 |
| 2026-06-04 00:00 |
13:10:13.79 |
-27:24:39.7 |
HIP 64193 |
22.32 |
| 2026-06-04 12:00 |
13:10:12.13 |
-27:24:18.7 |
HIP 64193 |
22.44 |
| 2026-06-05 00:00 |
13:10:10.49 |
-27:23:57.8 |
HIP 64193 |
22.56 |
| 2026-06-05 12:00 |
13:10:08.86 |
-27:23:36.9 |
HIP 64193 |
22.69 |
| 2026-06-06 00:00 |
13:10:07.26 |
-27:23:16.0 |
HIP 64193 |
22.84 |
| 2026-06-06 12:00 |
13:10:05.67 |
-27:22:55.2 |
HIP 64193 |
23.00 |
| 2026-06-07 00:00 |
13:10:04.11 |
-27:22:34.4 |
HIP 64193 |
23.17 |
| 2026-06-07 12:00 |
13:10:02.56 |
-27:22:13.6 |
HIP 64193 |
23.34 |
| 2026-06-08 00:00 |
13:10:01.04 |
-27:21:52.9 |
HIP 64193 |
23.53 |
| 2026-06-08 12:00 |
13:09:59.53 |
-27:21:32.3 |
HIP 64193 |
23.73 |
| 2026-06-09 00:00 |
13:09:58.05 |
-27:21:11.6 |
HIP 64193 |
23.94 |
| 2026-06-09 12:00 |
13:09:56.59 |
-27:20:51.1 |
HIP 64193 |
24.15 |
| 2026-06-10 00:00 |
13:09:55.14 |
-27:20:30.6 |
HIP 64193 |
24.37 |
| 2026-06-10 12:00 |
13:09:53.72 |
-27:20:10.1 |
HIP 64193 |
24.60 |
| 2026-06-11 00:00 |
13:09:52.32 |
-27:19:49.7 |
HIP 64193 |
24.84 |
| 2026-06-11 12:00 |
13:09:50.93 |
-27:19:29.3 |
HIP 64193 |
25.08 |
| 2026-06-12 00:00 |
13:09:49.57 |
-27:19:09.0 |
HIP 64193 |
25.33 |
| 2026-06-12 12:00 |
13:09:48.23 |
-27:18:48.8 |
HIP 64193 |
25.59 |
| 2026-06-13 00:00 |
13:09:46.91 |
-27:18:28.6 |
HIP 64193 |
25.85 |
| 2026-06-13 12:00 |
13:09:45.62 |
-27:18:08.5 |
HIP 64193 |
26.11 |
| 2026-06-14 00:00 |
13:09:44.34 |
-27:17:48.4 |
HIP 64193 |
26.38 |
| 2026-06-14 12:00 |
13:09:43.08 |
-27:17:28.4 |
HIP 64193 |
26.66 |
| 2026-06-15 00:00 |
13:09:41.85 |
-27:17:08.5 |
HIP 64193 |
26.94 |
| 2026-06-15 12:00 |
13:09:40.63 |
-27:16:48.6 |
HIP 64193 |
27.22 |
| 2026-06-16 00:00 |
13:09:39.44 |
-27:16:28.8 |
HIP 64193 |
27.50 |
| 2026-06-16 12:00 |
13:09:38.27 |
-27:16:09.0 |
HIP 64193 |
27.79 |
| 2026-06-17 00:00 |
13:09:37.12 |
-27:15:49.4 |
HIP 64193 |
28.08 |
| 2026-06-17 12:00 |
13:09:36.00 |
-27:15:29.8 |
HIP 64193 |
28.38 |
| 2026-06-18 00:00 |
13:09:34.89 |
-27:15:10.3 |
HIP 64193 |
28.67 |
| 2026-06-18 12:00 |
13:09:33.81 |
-27:14:50.8 |
HIP 64193 |
28.97 |
| 2026-06-19 00:00 |
13:09:32.75 |
-27:14:31.4 |
HIP 64193 |
29.27 |
| 2026-06-19 12:00 |
13:09:31.71 |
-27:14:12.1 |
HIP 64193 |
29.57 |
| 2026-06-20 00:00 |
13:09:30.69 |
-27:13:52.9 |
HIP 64193 |
29.87 |
| 2026-06-20 12:00 |
13:09:29.69 |
-27:13:33.8 |
HIP 64193 |
30.18 |
| 2026-06-21 00:00 |
13:09:28.72 |
-27:13:14.7 |
HIP 64193 |
30.48 |
| 2026-06-21 12:00 |
13:09:27.77 |
-27:12:55.7 |
HIP 64193 |
30.78 |
| 2026-06-22 00:00 |
13:09:26.84 |
-27:12:36.8 |
HIP 64193 |
31.09 |