287P/Christensen
メタデータ
| 項目 |
値 |
| Designation |
287P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-05T04:20:07.710720Z |
| Orbit solution date (soln_date, UTC) |
2025-10-30T09:37:11Z |
| Obs used |
270 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
15.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-12-28.0000000 |
| e |
0.27096868 |
| q (au) |
3.038241 |
| a (au) |
4.167503 |
| i (deg) |
16.320345 |
| Ω (om, deg) |
139.045236 |
| ω (w, deg) |
188.874131 |
| M (ma, deg) |
253.514373 |
等級
散乱 + 全体線形
$$
M_a = (10.191 + 5.080\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.191 |
| n |
5.080 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-05-13 |
2023-07-04 |
+6.3005 |
-3.721 |
| 2023-07-12 |
2024-12-26 |
+1.9974 |
-0.830 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
06:28:05.22 |
+11:55:22.3 |
HIP 30752 |
11.40 |
| 2026-02-03 12:00 |
06:27:53.33 |
+11:57:04.3 |
HIP 30752 |
12.00 |
| 2026-02-04 00:00 |
06:27:41.63 |
+11:58:46.6 |
HIP 30752 |
13.44 |
| 2026-02-04 12:00 |
06:27:30.12 |
+12:00:29.0 |
HIP 30752 |
15.47 |
| 2026-02-05 00:00 |
06:27:18.81 |
+12:02:11.5 |
HIP 30752 |
17.86 |
| 2026-02-05 12:00 |
06:27:07.70 |
+12:03:54.2 |
HIP 30752 |
20.48 |
| 2026-02-06 00:00 |
06:26:56.79 |
+12:05:37.1 |
HIP 30752 |
23.22 |
| 2026-02-06 12:00 |
06:26:46.07 |
+12:07:20.1 |
HIP 30752 |
26.04 |
| 2026-02-07 00:00 |
06:26:35.56 |
+12:09:03.2 |
HIP 30752 |
28.89 |
| 2026-02-07 12:00 |
06:26:25.25 |
+12:10:46.5 |
HIP 30752 |
31.76 |
| 2026-02-08 00:00 |
06:26:15.15 |
+12:12:29.8 |
HIP 30752 |
34.63 |
| 2026-02-08 12:00 |
06:26:05.25 |
+12:14:13.3 |
HIP 30542 |
35.56 |
| 2026-02-09 00:00 |
06:25:55.55 |
+12:15:56.8 |
HIP 30542 |
36.43 |
| 2026-02-09 12:00 |
06:25:46.07 |
+12:17:40.4 |
HIP 30542 |
37.52 |
| 2026-02-10 00:00 |
06:25:36.80 |
+12:19:24.1 |
HIP 30494 |
35.43 |
| 2026-02-10 12:00 |
06:25:27.73 |
+12:21:07.9 |
HIP 30494 |
32.97 |
| 2026-02-11 00:00 |
06:25:18.88 |
+12:22:51.7 |
HIP 30494 |
30.58 |
| 2026-02-11 12:00 |
06:25:10.24 |
+12:24:35.6 |
HIP 30494 |
28.27 |
| 2026-02-12 00:00 |
06:25:01.81 |
+12:26:19.5 |
HIP 30494 |
26.06 |
| 2026-02-12 12:00 |
06:24:53.60 |
+12:28:03.4 |
HIP 30494 |
23.95 |
| 2026-02-13 00:00 |
06:24:45.61 |
+12:29:47.4 |
HIP 30494 |
21.97 |
| 2026-02-13 12:00 |
06:24:37.83 |
+12:31:31.4 |
HIP 30494 |
20.13 |
| 2026-02-14 00:00 |
06:24:30.26 |
+12:33:15.4 |
HIP 30494 |
18.46 |
| 2026-02-14 12:00 |
06:24:22.92 |
+12:34:59.3 |
HIP 30494 |
16.99 |
| 2026-02-15 00:00 |
06:24:15.80 |
+12:36:43.3 |
HIP 30494 |
15.76 |
| 2026-02-15 12:00 |
06:24:08.89 |
+12:38:27.3 |
HIP 30494 |
14.82 |
| 2026-02-16 00:00 |
06:24:02.21 |
+12:40:11.2 |
HIP 30494 |
14.20 |
| 2026-02-16 12:00 |
06:23:55.75 |
+12:41:55.1 |
HIP 30494 |
13.92 |
| 2026-02-17 00:00 |
06:23:49.51 |
+12:43:38.9 |
HIP 30494 |
13.99 |
| 2026-02-17 12:00 |
06:23:43.49 |
+12:45:22.7 |
HIP 30494 |
14.38 |
| 2026-02-18 00:00 |
06:23:37.70 |
+12:47:06.4 |
HIP 30494 |
15.06 |
| 2026-02-18 12:00 |
06:23:32.13 |
+12:48:50.0 |
HIP 30494 |
15.96 |
| 2026-02-19 00:00 |
06:23:26.79 |
+12:50:33.6 |
HIP 30494 |
17.05 |
| 2026-02-19 12:00 |
06:23:21.67 |
+12:52:17.1 |
HIP 30494 |
18.27 |
| 2026-02-20 00:00 |
06:23:16.77 |
+12:54:00.5 |
HIP 30483 |
18.69 |
| 2026-02-20 12:00 |
06:23:12.10 |
+12:55:43.7 |
HIP 30483 |
19.22 |
| 2026-02-21 00:00 |
06:23:07.66 |
+12:57:26.9 |
HIP 30483 |
19.89 |
| 2026-02-21 12:00 |
06:23:03.44 |
+12:59:09.9 |
HIP 30245 |
20.52 |
| 2026-02-22 00:00 |
06:22:59.45 |
+13:00:52.9 |
HIP 30245 |
20.33 |
| 2026-02-22 12:00 |
06:22:55.68 |
+13:02:35.6 |
HIP 30245 |
20.37 |
| 2026-02-23 00:00 |
06:22:52.14 |
+13:04:18.3 |
HIP 30245 |
20.65 |
| 2026-02-23 12:00 |
06:22:48.83 |
+13:06:00.8 |
HIP 30245 |
21.13 |
| 2026-02-24 00:00 |
06:22:45.74 |
+13:07:43.1 |
HIP 30245 |
21.80 |