P/2000 R2 (LINEAR)
| Parameter |
Value |
| Designation |
P/2000 R2 (LINEAR) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2000-09-12T15:47:05.478720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:05Z |
| Obs used |
56 |
| NEO |
- |
| M1 |
19.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-09-20.0000000 |
| e |
0.58365455 |
| q (au) |
1.389967 |
| a (au) |
3.338494 |
| i (deg) |
3.216342 |
| Ω (om, deg) |
187.499425 |
| ω (w, deg) |
147.063490 |
| M (ma, deg) |
1.186343 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.097 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.097 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.987 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:35:40.14 |
-07:29:17.4 |
HIP 116428 |
2.45 |
| 2026-02-03 12:00 |
23:36:59.87 |
-07:22:35.4 |
HIP 116488 |
18.78 |
| 2026-02-04 00:00 |
23:38:19.49 |
-07:15:53.1 |
HIP 116488 |
31.53 |
| 2026-02-04 12:00 |
23:39:39.00 |
-07:09:10.2 |
HIP 116854 |
46.38 |
| 2026-02-05 00:00 |
23:40:58.40 |
-07:02:27.0 |
HIP 116854 |
33.90 |
| 2026-02-05 12:00 |
23:42:17.68 |
-06:55:43.4 |
HIP 116854 |
31.83 |
| 2026-02-06 00:00 |
23:43:36.85 |
-06:48:59.5 |
HIP 117131 |
18.92 |
| 2026-02-06 12:00 |
23:44:55.92 |
-06:42:15.2 |
HIP 117131 |
14.11 |
| 2026-02-07 00:00 |
23:46:14.87 |
-06:35:30.6 |
HIP 117131 |
30.01 |
| 2026-02-07 12:00 |
23:47:33.71 |
-06:28:45.7 |
HIP 117420 |
15.76 |
| 2026-02-08 00:00 |
23:48:52.44 |
-06:22:00.6 |
HIP 117420 |
5.03 |
| 2026-02-08 12:00 |
23:50:11.06 |
-06:15:15.2 |
HIP 117420 |
25.64 |
| 2026-02-09 00:00 |
23:51:29.58 |
-06:08:29.6 |
HIP 117736 |
19.74 |
| 2026-02-09 12:00 |
23:52:47.98 |
-06:01:43.7 |
HIP 117736 |
2.81 |
| 2026-02-10 00:00 |
23:54:06.28 |
-05:54:57.7 |
HIP 117736 |
21.83 |
| 2026-02-10 12:00 |
23:55:24.46 |
-05:48:11.6 |
HIP 118026 |
18.77 |
| 2026-02-11 00:00 |
23:56:42.54 |
-05:41:25.3 |
HIP 118080 |
15.44 |
| 2026-02-11 12:00 |
23:58:00.51 |
-05:34:38.8 |
HIP 118141 |
7.84 |
| 2026-02-12 00:00 |
23:59:18.38 |
-05:27:52.3 |
HIP 118141 |
22.35 |
| 2026-02-12 12:00 |
00:00:36.13 |
-05:21:05.8 |
HIP 157 |
22.47 |
| 2026-02-13 00:00 |
00:01:53.78 |
-05:14:19.1 |
HIP 157 |
2.15 |
| 2026-02-13 12:00 |
00:03:11.33 |
-05:07:32.5 |
HIP 205 |
9.76 |
| 2026-02-14 00:00 |
00:04:28.77 |
-05:00:45.8 |
HIP 327 |
6.81 |
| 2026-02-14 12:00 |
00:05:46.10 |
-04:53:59.2 |
HIP 327 |
23.72 |
| 2026-02-15 00:00 |
00:07:03.32 |
-04:47:12.6 |
HIP 642 |
13.06 |
| 2026-02-15 12:00 |
00:08:20.45 |
-04:40:26.1 |
HIP 642 |
12.82 |
| 2026-02-16 00:00 |
00:09:37.46 |
-04:33:39.7 |
HIP 642 |
31.41 |
| 2026-02-16 12:00 |
00:10:54.37 |
-04:26:53.3 |
HIP 936 |
38.60 |
| 2026-02-17 00:00 |
00:12:11.18 |
-04:20:07.1 |
HIP 1120 |
37.52 |
| 2026-02-17 12:00 |
00:13:27.88 |
-04:13:21.1 |
HIP 1120 |
20.58 |
| 2026-02-18 00:00 |
00:14:44.48 |
-04:06:35.2 |
HIP 1120 |
16.18 |
| 2026-02-18 12:00 |
00:16:00.97 |
-03:59:49.5 |
HIP 1241 |
22.22 |
| 2026-02-19 00:00 |
00:17:17.36 |
-03:53:04.0 |
HIP 1241 |
30.74 |
| 2026-02-19 12:00 |
00:18:33.64 |
-03:46:18.8 |
HIP 1420 |
32.04 |
| 2026-02-20 00:00 |
00:19:49.82 |
-03:39:33.8 |
HIP 1691 |
29.44 |
| 2026-02-20 12:00 |
00:21:05.90 |
-03:32:49.1 |
HIP 1691 |
14.21 |
| 2026-02-21 00:00 |
00:22:21.87 |
-03:26:04.8 |
HIP 1825 |
14.90 |
| 2026-02-21 12:00 |
00:23:37.74 |
-03:19:20.7 |
HIP 1900 |
10.70 |
| 2026-02-22 00:00 |
00:24:53.51 |
-03:12:37.0 |
HIP 1873 |
20.55 |
| 2026-02-22 12:00 |
00:26:09.17 |
-03:05:53.6 |
HIP 1873 |
37.36 |
| 2026-02-23 00:00 |
00:27:24.73 |
-02:59:10.6 |
HIP 2242 |
32.53 |
| 2026-02-23 12:00 |
00:28:40.19 |
-02:52:28.1 |
HIP 2323 |
14.83 |
| 2026-02-24 00:00 |
00:29:55.55 |
-02:45:45.9 |
HIP 2323 |
6.22 |