メタデータ
| 項目 |
値 |
| 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 |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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 |
等級
散乱 + 全体線形
$$
M_a = (1.577 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.577 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 1998-08-27 |
2000-05-22 |
-0.2602 |
+0.449 |
| 2000-05-29 |
2002-05-06 |
+11.7020 |
-9.733 |
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) |
| 2026-09-20 00:00 |
07:54:28.27 |
+03:24:36.6 |
HIP 38717 |
18.75 |
| 2026-09-20 12:00 |
07:54:29.29 |
+03:24:22.8 |
HIP 38717 |
18.42 |
| 2026-09-21 00:00 |
07:54:30.29 |
+03:24:09.0 |
HIP 38717 |
18.10 |
| 2026-09-21 12:00 |
07:54:31.28 |
+03:23:55.1 |
HIP 38717 |
17.77 |
| 2026-09-22 00:00 |
07:54:32.25 |
+03:23:41.3 |
HIP 38717 |
17.46 |
| 2026-09-22 12:00 |
07:54:33.19 |
+03:23:27.5 |
HIP 38717 |
17.15 |
| 2026-09-23 00:00 |
07:54:34.12 |
+03:23:13.7 |
HIP 38717 |
16.84 |
| 2026-09-23 12:00 |
07:54:35.03 |
+03:23:00.0 |
HIP 38717 |
16.54 |
| 2026-09-24 00:00 |
07:54:35.92 |
+03:22:46.1 |
HIP 38717 |
16.24 |
| 2026-09-24 12:00 |
07:54:36.79 |
+03:22:32.3 |
HIP 38717 |
15.95 |
| 2026-09-25 00:00 |
07:54:37.64 |
+03:22:18.5 |
HIP 38717 |
15.67 |
| 2026-09-25 12:00 |
07:54:38.47 |
+03:22:04.8 |
HIP 38717 |
15.39 |
| 2026-09-26 00:00 |
07:54:39.29 |
+03:21:51.0 |
HIP 38717 |
15.12 |
| 2026-09-26 12:00 |
07:54:40.08 |
+03:21:37.3 |
HIP 38717 |
14.85 |
| 2026-09-27 00:00 |
07:54:40.85 |
+03:21:23.5 |
HIP 38717 |
14.59 |
| 2026-09-27 12:00 |
07:54:41.60 |
+03:21:09.8 |
HIP 38717 |
14.33 |
| 2026-09-28 00:00 |
07:54:42.34 |
+03:20:56.1 |
HIP 38717 |
14.09 |
| 2026-09-28 12:00 |
07:54:43.05 |
+03:20:42.4 |
HIP 38717 |
13.84 |
| 2026-09-29 00:00 |
07:54:43.74 |
+03:20:28.7 |
HIP 38717 |
13.61 |
| 2026-09-29 12:00 |
07:54:44.41 |
+03:20:15.1 |
HIP 38717 |
13.38 |
| 2026-09-30 00:00 |
07:54:45.06 |
+03:20:01.4 |
HIP 38717 |
13.16 |
| 2026-09-30 12:00 |
07:54:45.70 |
+03:19:47.8 |
HIP 38717 |
12.95 |
| 2026-10-01 00:00 |
07:54:46.31 |
+03:19:34.2 |
HIP 38717 |
12.74 |
| 2026-10-01 12:00 |
07:54:46.90 |
+03:19:20.6 |
HIP 38717 |
12.54 |
| 2026-10-02 00:00 |
07:54:47.47 |
+03:19:07.0 |
HIP 38717 |
12.35 |
| 2026-10-02 12:00 |
07:54:48.02 |
+03:18:53.5 |
HIP 38717 |
12.17 |
| 2026-10-03 00:00 |
07:54:48.54 |
+03:18:40.0 |
HIP 38717 |
11.99 |
| 2026-10-03 12:00 |
07:54:49.05 |
+03:18:26.5 |
HIP 38717 |
11.82 |
| 2026-10-04 00:00 |
07:54:49.54 |
+03:18:13.0 |
HIP 38717 |
11.67 |
| 2026-10-04 12:00 |
07:54:50.00 |
+03:17:59.6 |
HIP 38717 |
11.52 |
| 2026-10-05 00:00 |
07:54:50.45 |
+03:17:46.1 |
HIP 38717 |
11.38 |
| 2026-10-05 12:00 |
07:54:50.87 |
+03:17:32.7 |
HIP 38717 |
11.25 |
| 2026-10-06 00:00 |
07:54:51.27 |
+03:17:19.4 |
HIP 38717 |
11.12 |
| 2026-10-06 12:00 |
07:54:51.65 |
+03:17:06.1 |
HIP 38717 |
11.01 |
| 2026-10-07 00:00 |
07:54:52.01 |
+03:16:52.8 |
HIP 38717 |
10.91 |
| 2026-10-07 12:00 |
07:54:52.35 |
+03:16:39.5 |
HIP 38717 |
10.82 |
| 2026-10-08 00:00 |
07:54:52.67 |
+03:16:26.3 |
HIP 38717 |
10.73 |
| 2026-10-08 12:00 |
07:54:52.96 |
+03:16:13.1 |
HIP 38717 |
10.66 |
| 2026-10-09 00:00 |
07:54:53.23 |
+03:15:59.9 |
HIP 38717 |
10.59 |
| 2026-10-09 12:00 |
07:54:53.48 |
+03:15:46.8 |
HIP 38717 |
10.54 |
| 2026-10-10 00:00 |
07:54:53.71 |
+03:15:33.7 |
HIP 38717 |
10.50 |
| 2026-10-10 12:00 |
07:54:53.92 |
+03:15:20.6 |
HIP 38717 |
10.46 |
| 2026-10-11 00:00 |
07:54:54.11 |
+03:15:07.6 |
HIP 38717 |
10.44 |