메타데이터
| 항목 |
값 |
| Designation |
C/1998 U5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-12-21T18:14:25.114560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
406 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
15.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1998-12-01.0000000 |
| e |
0.98797943 |
| q (au) |
1.236453 |
| a (au) |
102.861449 |
| i (deg) |
131.764750 |
| Ω (om, deg) |
66.650605 |
| ω (w, deg) |
51.134275 |
| M (ma, deg) |
359.980387 |
밝기
산란 + 전체 선형
$$
M_a = (8.137 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.137 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.503 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 1998-10-30 |
1998-12-21 |
+23.4645 |
-2.542 |
| 1998-12-21 |
1999-05-11 |
-3.5652 |
+0.381 |
| 1999-05-11 |
1999-12-09 |
-44.9953 |
+16.194 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
13:55:14.72 |
-39:18:51.4 |
HIP 68047 |
10.22 |
| 2026-06-01 12:00 |
13:55:12.27 |
-39:18:31.9 |
HIP 68047 |
10.79 |
| 2026-06-02 00:00 |
13:55:09.83 |
-39:18:12.3 |
HIP 68047 |
11.36 |
| 2026-06-02 12:00 |
13:55:07.41 |
-39:17:52.6 |
HIP 68047 |
11.94 |
| 2026-06-03 00:00 |
13:55:05.01 |
-39:17:32.9 |
HIP 68047 |
12.51 |
| 2026-06-03 12:00 |
13:55:02.62 |
-39:17:13.2 |
HIP 68047 |
13.07 |
| 2026-06-04 00:00 |
13:55:00.26 |
-39:16:53.4 |
HIP 68047 |
13.64 |
| 2026-06-04 12:00 |
13:54:57.91 |
-39:16:33.6 |
HIP 68047 |
14.20 |
| 2026-06-05 00:00 |
13:54:55.58 |
-39:16:13.7 |
HIP 68047 |
14.76 |
| 2026-06-05 12:00 |
13:54:53.27 |
-39:15:53.8 |
HIP 68047 |
15.31 |
| 2026-06-06 00:00 |
13:54:50.97 |
-39:15:33.9 |
HIP 68047 |
15.87 |
| 2026-06-06 12:00 |
13:54:48.70 |
-39:15:13.9 |
HIP 68047 |
16.42 |
| 2026-06-07 00:00 |
13:54:46.44 |
-39:14:53.9 |
HIP 67810 |
16.58 |
| 2026-06-07 12:00 |
13:54:44.20 |
-39:14:33.8 |
HIP 67810 |
16.34 |
| 2026-06-08 00:00 |
13:54:41.98 |
-39:14:13.8 |
HIP 67810 |
16.11 |
| 2026-06-08 12:00 |
13:54:39.78 |
-39:13:53.7 |
HIP 67810 |
15.91 |
| 2026-06-09 00:00 |
13:54:37.61 |
-39:13:33.5 |
HIP 67810 |
15.72 |
| 2026-06-09 12:00 |
13:54:35.45 |
-39:13:13.4 |
HIP 67810 |
15.55 |
| 2026-06-10 00:00 |
13:54:33.30 |
-39:12:53.2 |
HIP 67810 |
15.41 |
| 2026-06-10 12:00 |
13:54:31.18 |
-39:12:33.0 |
HIP 67809 |
15.24 |
| 2026-06-11 00:00 |
13:54:29.08 |
-39:12:12.8 |
HIP 67809 |
14.71 |
| 2026-06-11 12:00 |
13:54:27.00 |
-39:11:52.5 |
HIP 67809 |
14.18 |
| 2026-06-12 00:00 |
13:54:24.94 |
-39:11:32.3 |
HIP 67809 |
13.66 |
| 2026-06-12 12:00 |
13:54:22.90 |
-39:11:12.0 |
HIP 67809 |
13.14 |
| 2026-06-13 00:00 |
13:54:20.89 |
-39:10:51.7 |
HIP 67809 |
12.63 |
| 2026-06-13 12:00 |
13:54:18.89 |
-39:10:31.4 |
HIP 67809 |
12.12 |
| 2026-06-14 00:00 |
13:54:16.91 |
-39:10:11.1 |
HIP 67809 |
11.61 |
| 2026-06-14 12:00 |
13:54:14.95 |
-39:09:50.8 |
HIP 67809 |
11.10 |
| 2026-06-15 00:00 |
13:54:13.02 |
-39:09:30.4 |
HIP 67809 |
10.60 |
| 2026-06-15 12:00 |
13:54:11.11 |
-39:09:10.1 |
HIP 67809 |
10.10 |
| 2026-06-16 00:00 |
13:54:09.21 |
-39:08:49.7 |
HIP 67809 |
9.61 |
| 2026-06-16 12:00 |
13:54:07.34 |
-39:08:29.4 |
HIP 67809 |
9.12 |
| 2026-06-17 00:00 |
13:54:05.49 |
-39:08:09.1 |
HIP 67809 |
8.63 |
| 2026-06-17 12:00 |
13:54:03.67 |
-39:07:48.7 |
HIP 67809 |
8.15 |
| 2026-06-18 00:00 |
13:54:01.86 |
-39:07:28.4 |
HIP 67809 |
7.67 |
| 2026-06-18 12:00 |
13:54:00.08 |
-39:07:08.0 |
HIP 67809 |
7.20 |
| 2026-06-19 00:00 |
13:53:58.32 |
-39:06:47.7 |
HIP 67809 |
6.74 |
| 2026-06-19 12:00 |
13:53:56.58 |
-39:06:27.4 |
HIP 67809 |
6.28 |
| 2026-06-20 00:00 |
13:53:54.86 |
-39:06:07.1 |
HIP 67809 |
5.82 |
| 2026-06-20 12:00 |
13:53:53.17 |
-39:05:46.8 |
HIP 67809 |
5.38 |
| 2026-06-21 00:00 |
13:53:51.50 |
-39:05:26.5 |
HIP 67809 |
4.94 |
| 2026-06-21 12:00 |
13:53:49.85 |
-39:05:06.2 |
HIP 67809 |
4.52 |
| 2026-06-22 00:00 |
13:53:48.22 |
-39:04:45.9 |
HIP 67809 |
4.10 |