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) |
| 2026-05-12 00:00 |
07:46:21.15 |
+03:48:28.0 |
HIP 37912 |
7.79 |
| 2026-05-12 12:00 |
07:46:22.08 |
+03:48:35.3 |
HIP 37912 |
7.99 |
| 2026-05-13 00:00 |
07:46:23.03 |
+03:48:42.6 |
HIP 37912 |
8.20 |
| 2026-05-13 12:00 |
07:46:24.00 |
+03:48:49.8 |
HIP 37912 |
8.41 |
| 2026-05-14 00:00 |
07:46:24.99 |
+03:48:56.9 |
HIP 37912 |
8.62 |
| 2026-05-14 12:00 |
07:46:26.00 |
+03:49:03.8 |
HIP 37912 |
8.84 |
| 2026-05-15 00:00 |
07:46:27.03 |
+03:49:10.7 |
HIP 37912 |
9.07 |
| 2026-05-15 12:00 |
07:46:28.08 |
+03:49:17.5 |
HIP 37912 |
9.29 |
| 2026-05-16 00:00 |
07:46:29.14 |
+03:49:24.2 |
HIP 37912 |
9.52 |
| 2026-05-16 12:00 |
07:46:30.23 |
+03:49:30.7 |
HIP 37912 |
9.76 |
| 2026-05-17 00:00 |
07:46:31.33 |
+03:49:37.2 |
HIP 37912 |
10.00 |
| 2026-05-17 12:00 |
07:46:32.45 |
+03:49:43.6 |
HIP 37912 |
10.24 |
| 2026-05-18 00:00 |
07:46:33.59 |
+03:49:49.8 |
HIP 37912 |
10.49 |
| 2026-05-18 12:00 |
07:46:34.75 |
+03:49:56.0 |
HIP 37912 |
10.74 |
| 2026-05-19 00:00 |
07:46:35.93 |
+03:50:02.0 |
HIP 37912 |
11.00 |
| 2026-05-19 12:00 |
07:46:37.12 |
+03:50:08.0 |
HIP 37912 |
11.26 |
| 2026-05-20 00:00 |
07:46:38.33 |
+03:50:13.8 |
HIP 37912 |
11.52 |
| 2026-05-20 12:00 |
07:46:39.56 |
+03:50:19.6 |
HIP 37912 |
11.79 |
| 2026-05-21 00:00 |
07:46:40.81 |
+03:50:25.2 |
HIP 37912 |
12.06 |
| 2026-05-21 12:00 |
07:46:42.07 |
+03:50:30.7 |
HIP 37912 |
12.34 |
| 2026-05-22 00:00 |
07:46:43.35 |
+03:50:36.1 |
HIP 37912 |
12.62 |
| 2026-05-22 12:00 |
07:46:44.65 |
+03:50:41.4 |
HIP 37912 |
12.90 |
| 2026-05-23 00:00 |
07:46:45.97 |
+03:50:46.7 |
HIP 37912 |
13.19 |
| 2026-05-23 12:00 |
07:46:47.30 |
+03:50:51.8 |
HIP 37912 |
13.48 |
| 2026-05-24 00:00 |
07:46:48.65 |
+03:50:56.8 |
HIP 37912 |
13.78 |
| 2026-05-24 12:00 |
07:46:50.01 |
+03:51:01.6 |
HIP 37912 |
14.08 |
| 2026-05-25 00:00 |
07:46:51.40 |
+03:51:06.4 |
HIP 37912 |
14.38 |
| 2026-05-25 12:00 |
07:46:52.79 |
+03:51:11.1 |
HIP 37912 |
14.69 |
| 2026-05-26 00:00 |
07:46:54.21 |
+03:51:15.7 |
HIP 37912 |
15.00 |
| 2026-05-26 12:00 |
07:46:55.64 |
+03:51:20.1 |
HIP 37912 |
15.32 |
| 2026-05-27 00:00 |
07:46:57.09 |
+03:51:24.5 |
HIP 37912 |
15.64 |
| 2026-05-27 12:00 |
07:46:58.55 |
+03:51:28.7 |
HIP 37912 |
15.97 |
| 2026-05-28 00:00 |
07:47:00.03 |
+03:51:32.9 |
HIP 37912 |
16.29 |
| 2026-05-28 12:00 |
07:47:01.52 |
+03:51:36.9 |
HIP 37912 |
16.63 |
| 2026-05-29 00:00 |
07:47:03.03 |
+03:51:40.8 |
HIP 37912 |
16.96 |
| 2026-05-29 12:00 |
07:47:04.55 |
+03:51:44.6 |
HIP 37912 |
17.30 |
| 2026-05-30 00:00 |
07:47:06.09 |
+03:51:48.3 |
HIP 37912 |
17.65 |
| 2026-05-30 12:00 |
07:47:07.65 |
+03:51:51.9 |
HIP 37942 |
17.89 |
| 2026-05-31 00:00 |
07:47:09.22 |
+03:51:55.4 |
HIP 37942 |
18.01 |
| 2026-05-31 12:00 |
07:47:10.80 |
+03:51:58.8 |
HIP 37942 |
18.15 |
| 2026-06-01 00:00 |
07:47:12.40 |
+03:52:02.0 |
HIP 37942 |
18.30 |
| 2026-06-01 12:00 |
07:47:14.02 |
+03:52:05.2 |
HIP 37942 |
18.47 |
| 2026-06-02 00:00 |
07:47:15.64 |
+03:52:08.2 |
HIP 37942 |
18.64 |