메타데이터
| 항목 |
값 |
| Designation |
C/1999 J4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-11-17T10:01:47.156160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1999-05-20.0000000 |
| e |
0.99971322 |
| q (au) |
3.781074 |
| a (au) |
13184.435879 |
| i (deg) |
118.909155 |
| Ω (om, deg) |
264.479748 |
| ω (w, deg) |
95.116153 |
| M (ma, deg) |
359.999882 |
밝기
산란 + 전체 선형
$$
M_a = (5.599 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.599 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:47:52.99 |
-33:22:48.1 |
HIP 17742 |
13.00 |
| 2026-09-20 12:00 |
03:47:51.47 |
-33:23:19.4 |
HIP 17742 |
12.52 |
| 2026-09-21 00:00 |
03:47:49.92 |
-33:23:50.5 |
HIP 17742 |
12.04 |
| 2026-09-21 12:00 |
03:47:48.34 |
-33:24:21.6 |
HIP 17742 |
11.59 |
| 2026-09-22 00:00 |
03:47:46.74 |
-33:24:52.5 |
HIP 17742 |
11.15 |
| 2026-09-22 12:00 |
03:47:45.13 |
-33:25:23.4 |
HIP 17742 |
10.73 |
| 2026-09-23 00:00 |
03:47:43.48 |
-33:25:54.2 |
HIP 17742 |
10.33 |
| 2026-09-23 12:00 |
03:47:41.82 |
-33:26:24.9 |
HIP 17742 |
9.96 |
| 2026-09-24 00:00 |
03:47:40.13 |
-33:26:55.5 |
HIP 17742 |
9.61 |
| 2026-09-24 12:00 |
03:47:38.43 |
-33:27:26.0 |
HIP 17742 |
9.30 |
| 2026-09-25 00:00 |
03:47:36.70 |
-33:27:56.3 |
HIP 17742 |
9.02 |
| 2026-09-25 12:00 |
03:47:34.94 |
-33:28:26.6 |
HIP 17742 |
8.79 |
| 2026-09-26 00:00 |
03:47:33.17 |
-33:28:56.8 |
HIP 17742 |
8.59 |
| 2026-09-26 12:00 |
03:47:31.37 |
-33:29:26.9 |
HIP 17742 |
8.44 |
| 2026-09-27 00:00 |
03:47:29.56 |
-33:29:56.8 |
HIP 17742 |
8.35 |
| 2026-09-27 12:00 |
03:47:27.72 |
-33:30:26.7 |
HIP 17742 |
8.30 |
| 2026-09-28 00:00 |
03:47:25.86 |
-33:30:56.4 |
HIP 17742 |
8.30 |
| 2026-09-28 12:00 |
03:47:23.98 |
-33:31:26.0 |
HIP 17742 |
8.36 |
| 2026-09-29 00:00 |
03:47:22.07 |
-33:31:55.5 |
HIP 17742 |
8.47 |
| 2026-09-29 12:00 |
03:47:20.15 |
-33:32:24.8 |
HIP 17742 |
8.62 |
| 2026-09-30 00:00 |
03:47:18.20 |
-33:32:54.1 |
HIP 17742 |
8.83 |
| 2026-09-30 12:00 |
03:47:16.24 |
-33:33:23.2 |
HIP 17742 |
9.08 |
| 2026-10-01 00:00 |
03:47:14.25 |
-33:33:52.2 |
HIP 17742 |
9.37 |
| 2026-10-01 12:00 |
03:47:12.24 |
-33:34:21.0 |
HIP 17742 |
9.70 |
| 2026-10-02 00:00 |
03:47:10.22 |
-33:34:49.8 |
HIP 17742 |
10.06 |
| 2026-10-02 12:00 |
03:47:08.17 |
-33:35:18.4 |
HIP 17742 |
10.45 |
| 2026-10-03 00:00 |
03:47:06.10 |
-33:35:46.8 |
HIP 17742 |
10.87 |
| 2026-10-03 12:00 |
03:47:04.01 |
-33:36:15.1 |
HIP 17742 |
11.32 |
| 2026-10-04 00:00 |
03:47:01.90 |
-33:36:43.3 |
HIP 17742 |
11.78 |
| 2026-10-04 12:00 |
03:46:59.77 |
-33:37:11.3 |
HIP 17742 |
12.27 |
| 2026-10-05 00:00 |
03:46:57.62 |
-33:37:39.2 |
HIP 17742 |
12.78 |
| 2026-10-05 12:00 |
03:46:55.46 |
-33:38:07.0 |
HIP 17742 |
13.30 |
| 2026-10-06 00:00 |
03:46:53.27 |
-33:38:34.5 |
HIP 17742 |
13.83 |
| 2026-10-06 12:00 |
03:46:51.06 |
-33:39:02.0 |
HIP 17742 |
14.38 |
| 2026-10-07 00:00 |
03:46:48.83 |
-33:39:29.3 |
HIP 17742 |
14.93 |
| 2026-10-07 12:00 |
03:46:46.59 |
-33:39:56.4 |
HIP 17742 |
15.50 |
| 2026-10-08 00:00 |
03:46:44.32 |
-33:40:23.4 |
HIP 17742 |
16.08 |
| 2026-10-08 12:00 |
03:46:42.04 |
-33:40:50.2 |
HIP 17742 |
16.67 |
| 2026-10-09 00:00 |
03:46:39.74 |
-33:41:16.8 |
HIP 17742 |
17.26 |
| 2026-10-09 12:00 |
03:46:37.42 |
-33:41:43.3 |
HIP 17742 |
17.86 |
| 2026-10-10 00:00 |
03:46:35.08 |
-33:42:09.6 |
HIP 17742 |
18.47 |
| 2026-10-10 12:00 |
03:46:32.72 |
-33:42:35.7 |
HIP 17742 |
19.08 |
| 2026-10-11 00:00 |
03:46:30.35 |
-33:43:01.7 |
HIP 17742 |
19.69 |