메타데이터
| 항목 |
값 |
| Designation |
C/1997 G2 (Montani) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-04-16T07:14:20.978880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1997-07-26.0000000 |
| e |
0.99416325 |
| q (au) |
3.084963 |
| a (au) |
528.541310 |
| i (deg) |
69.835498 |
| Ω (om, deg) |
55.802519 |
| ω (w, deg) |
239.843035 |
| M (ma, deg) |
359.978562 |
밝기
산란 + 전체 선형
$$
M_a = (4.554 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.554 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
04:01:38.44 |
+51:05:40.5 |
HIP 18668 |
20.80 |
| 2026-09-20 12:00 |
04:01:36.84 |
+51:05:56.3 |
HIP 18668 |
20.75 |
| 2026-09-21 00:00 |
04:01:35.21 |
+51:06:12.0 |
HIP 18668 |
20.70 |
| 2026-09-21 12:00 |
04:01:33.54 |
+51:06:27.6 |
HIP 18668 |
20.65 |
| 2026-09-22 00:00 |
04:01:31.85 |
+51:06:43.1 |
HIP 18668 |
20.61 |
| 2026-09-22 12:00 |
04:01:30.13 |
+51:06:58.5 |
HIP 18668 |
20.57 |
| 2026-09-23 00:00 |
04:01:28.38 |
+51:07:13.8 |
HIP 18668 |
20.52 |
| 2026-09-23 12:00 |
04:01:26.60 |
+51:07:28.9 |
HIP 18668 |
20.48 |
| 2026-09-24 00:00 |
04:01:24.78 |
+51:07:43.9 |
HIP 18668 |
20.45 |
| 2026-09-24 12:00 |
04:01:22.94 |
+51:07:58.8 |
HIP 18668 |
20.41 |
| 2026-09-25 00:00 |
04:01:21.07 |
+51:08:13.6 |
HIP 18668 |
20.38 |
| 2026-09-25 12:00 |
04:01:19.18 |
+51:08:28.2 |
HIP 18668 |
20.35 |
| 2026-09-26 00:00 |
04:01:17.25 |
+51:08:42.7 |
HIP 18668 |
20.32 |
| 2026-09-26 12:00 |
04:01:15.29 |
+51:08:57.1 |
HIP 18668 |
20.30 |
| 2026-09-27 00:00 |
04:01:13.31 |
+51:09:11.4 |
HIP 18668 |
20.28 |
| 2026-09-27 12:00 |
04:01:11.29 |
+51:09:25.6 |
HIP 18668 |
20.26 |
| 2026-09-28 00:00 |
04:01:09.25 |
+51:09:39.6 |
HIP 18668 |
20.24 |
| 2026-09-28 12:00 |
04:01:07.18 |
+51:09:53.5 |
HIP 18668 |
20.23 |
| 2026-09-29 00:00 |
04:01:05.08 |
+51:10:07.3 |
HIP 18668 |
20.22 |
| 2026-09-29 12:00 |
04:01:02.96 |
+51:10:20.9 |
HIP 18668 |
20.22 |
| 2026-09-30 00:00 |
04:01:00.80 |
+51:10:34.4 |
HIP 18668 |
20.22 |
| 2026-09-30 12:00 |
04:00:58.62 |
+51:10:47.8 |
HIP 18668 |
20.22 |
| 2026-10-01 00:00 |
04:00:56.41 |
+51:11:01.0 |
HIP 18668 |
20.23 |
| 2026-10-01 12:00 |
04:00:54.17 |
+51:11:14.1 |
HIP 18668 |
20.24 |
| 2026-10-02 00:00 |
04:00:51.90 |
+51:11:27.1 |
HIP 18668 |
20.26 |
| 2026-10-02 12:00 |
04:00:49.61 |
+51:11:39.9 |
HIP 18668 |
20.28 |
| 2026-10-03 00:00 |
04:00:47.29 |
+51:11:52.6 |
HIP 18668 |
20.31 |
| 2026-10-03 12:00 |
04:00:44.94 |
+51:12:05.1 |
HIP 18668 |
20.34 |
| 2026-10-04 00:00 |
04:00:42.57 |
+51:12:17.5 |
HIP 18668 |
20.37 |
| 2026-10-04 12:00 |
04:00:40.17 |
+51:12:29.8 |
HIP 18668 |
20.42 |
| 2026-10-05 00:00 |
04:00:37.74 |
+51:12:41.9 |
HIP 18668 |
20.46 |
| 2026-10-05 12:00 |
04:00:35.29 |
+51:12:53.9 |
HIP 18668 |
20.51 |
| 2026-10-06 00:00 |
04:00:32.80 |
+51:13:05.8 |
HIP 18668 |
20.57 |
| 2026-10-06 12:00 |
04:00:30.30 |
+51:13:17.4 |
HIP 18668 |
20.63 |
| 2026-10-07 00:00 |
04:00:27.77 |
+51:13:29.0 |
HIP 18668 |
20.70 |
| 2026-10-07 12:00 |
04:00:25.21 |
+51:13:40.4 |
HIP 18668 |
20.77 |
| 2026-10-08 00:00 |
04:00:22.62 |
+51:13:51.6 |
HIP 18668 |
20.85 |
| 2026-10-08 12:00 |
04:00:20.01 |
+51:14:02.7 |
HIP 18668 |
20.94 |
| 2026-10-09 00:00 |
04:00:17.38 |
+51:14:13.7 |
HIP 18603 |
20.66 |
| 2026-10-09 12:00 |
04:00:14.72 |
+51:14:24.5 |
HIP 18603 |
20.26 |
| 2026-10-10 00:00 |
04:00:12.03 |
+51:14:35.1 |
HIP 18603 |
19.85 |
| 2026-10-10 12:00 |
04:00:09.32 |
+51:14:45.6 |
HIP 18603 |
19.44 |
| 2026-10-11 00:00 |
04:00:06.59 |
+51:14:55.9 |
HIP 18603 |
19.04 |