메타데이터
| 항목 |
값 |
| Designation |
C/1999 J2 (Skiff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-04-05T23:39:38.044800Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:22Z |
| Obs used |
978 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
7.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2000-04-28.0000000 |
| e |
1.00112158 |
| q (au) |
7.109764 |
| a (au) |
-6339.047335 |
| i (deg) |
86.412859 |
| Ω (om, deg) |
50.042373 |
| ω (w, deg) |
127.138683 |
| M (ma, deg) |
0.000043 |
밝기
산란 + 전체 선형
$$
M_a = (-2.294 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
-2.294 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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 |
| 2000-04-06 |
2002-03-22 |
+20.3121 |
-17.666 |
| 2002-03-22 |
2003-05-29 |
+4.9690 |
-3.057 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:14:48.00 |
-75:05:31.3 |
HIP 35448 |
18.79 |
| 2026-07-29 12:00 |
07:14:56.94 |
-75:05:41.9 |
HIP 35448 |
18.20 |
| 2026-07-30 00:00 |
07:15:05.85 |
-75:05:52.7 |
HIP 35448 |
17.61 |
| 2026-07-30 12:00 |
07:15:14.75 |
-75:06:03.9 |
HIP 35448 |
17.02 |
| 2026-07-31 00:00 |
07:15:23.61 |
-75:06:15.3 |
HIP 35448 |
16.43 |
| 2026-07-31 12:00 |
07:15:32.44 |
-75:06:27.0 |
HIP 35448 |
15.84 |
| 2026-08-01 00:00 |
07:15:41.25 |
-75:06:39.0 |
HIP 35448 |
15.25 |
| 2026-08-01 12:00 |
07:15:50.03 |
-75:06:51.3 |
HIP 35448 |
14.66 |
| 2026-08-02 00:00 |
07:15:58.79 |
-75:07:03.9 |
HIP 35448 |
14.07 |
| 2026-08-02 12:00 |
07:16:07.51 |
-75:07:16.8 |
HIP 35448 |
13.47 |
| 2026-08-03 00:00 |
07:16:16.20 |
-75:07:30.0 |
HIP 35448 |
12.88 |
| 2026-08-03 12:00 |
07:16:24.86 |
-75:07:43.5 |
HIP 35448 |
12.29 |
| 2026-08-04 00:00 |
07:16:33.50 |
-75:07:57.2 |
HIP 35448 |
11.70 |
| 2026-08-04 12:00 |
07:16:42.10 |
-75:08:11.3 |
HIP 35448 |
11.11 |
| 2026-08-05 00:00 |
07:16:50.66 |
-75:08:25.6 |
HIP 35448 |
10.52 |
| 2026-08-05 12:00 |
07:16:59.20 |
-75:08:40.2 |
HIP 35448 |
9.93 |
| 2026-08-06 00:00 |
07:17:07.70 |
-75:08:55.1 |
HIP 35448 |
9.34 |
| 2026-08-06 12:00 |
07:17:16.17 |
-75:09:10.3 |
HIP 35448 |
8.75 |
| 2026-08-07 00:00 |
07:17:24.61 |
-75:09:25.8 |
HIP 35448 |
8.16 |
| 2026-08-07 12:00 |
07:17:33.01 |
-75:09:41.5 |
HIP 35448 |
7.57 |
| 2026-08-08 00:00 |
07:17:41.37 |
-75:09:57.6 |
HIP 35448 |
6.98 |
| 2026-08-08 12:00 |
07:17:49.70 |
-75:10:13.9 |
HIP 35448 |
6.40 |
| 2026-08-09 00:00 |
07:17:57.99 |
-75:10:30.5 |
HIP 35448 |
5.81 |
| 2026-08-09 12:00 |
07:18:06.25 |
-75:10:47.4 |
HIP 35448 |
5.22 |
| 2026-08-10 00:00 |
07:18:14.47 |
-75:11:04.6 |
HIP 35448 |
4.64 |
| 2026-08-10 12:00 |
07:18:22.65 |
-75:11:22.0 |
HIP 35448 |
4.06 |
| 2026-08-11 00:00 |
07:18:30.79 |
-75:11:39.7 |
HIP 35448 |
3.49 |
| 2026-08-11 12:00 |
07:18:38.89 |
-75:11:57.7 |
HIP 35448 |
2.92 |
| 2026-08-12 00:00 |
07:18:46.95 |
-75:12:16.0 |
HIP 35448 |
2.36 |
| 2026-08-12 12:00 |
07:18:54.97 |
-75:12:34.6 |
HIP 35448 |
1.83 |
| 2026-08-13 00:00 |
07:19:02.94 |
-75:12:53.4 |
HIP 35448 |
1.35 |
| 2026-08-13 12:00 |
07:19:10.88 |
-75:13:12.5 |
HIP 35448 |
1.00 |
| 2026-08-14 00:00 |
07:19:18.77 |
-75:13:31.8 |
HIP 35448 |
0.94 |
| 2026-08-14 12:00 |
07:19:26.62 |
-75:13:51.5 |
HIP 35448 |
1.21 |
| 2026-08-15 00:00 |
07:19:34.43 |
-75:14:11.4 |
HIP 35448 |
1.66 |
| 2026-08-15 12:00 |
07:19:42.19 |
-75:14:31.5 |
HIP 35448 |
2.18 |
| 2026-08-16 00:00 |
07:19:49.90 |
-75:14:52.0 |
HIP 35448 |
2.73 |
| 2026-08-16 12:00 |
07:19:57.58 |
-75:15:12.7 |
HIP 35448 |
3.29 |
| 2026-08-17 00:00 |
07:20:05.20 |
-75:15:33.6 |
HIP 35448 |
3.87 |
| 2026-08-17 12:00 |
07:20:12.78 |
-75:15:54.8 |
HIP 35448 |
4.45 |
| 2026-08-18 00:00 |
07:20:20.31 |
-75:16:16.3 |
HIP 35448 |
5.03 |
| 2026-08-18 12:00 |
07:20:27.79 |
-75:16:38.0 |
HIP 35448 |
5.61 |
| 2026-08-19 00:00 |
07:20:35.23 |
-75:17:00.0 |
HIP 35448 |
6.20 |