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125P/Spacewatch

메타데이터

항목 값
Designation 125P/Spacewatch
Type P
Perihelion (tp_cal, UTC) 2013-02-17T02:03:36.748800Z
Orbit solution date (soln_date, UTC) 2024-10-29T14:53:15Z
Obs used 1297
NEO -
M1 12.900
K1 16.000
PC 0.030
Osculating 궤도요소
항목 값
Epoch (epoch_cal, TDB) 2015-08-11.0000000
e 0.51269168
q (au) 1.523187
a (au) 3.125715
i (deg) 9.988031
Ω (om, deg) 153.195189
ω (w, deg) 87.145345
M (ma, deg) 161.393997

밝기

125P/Spacewatch · Magnitude (Full range)

산란 + 전체 선형

$$ M_a = (12.400 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목 값
H0 12.400
n 6.000
gf 1.000
gb -0.850
k 0.999
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)
2026-02-03 00:00 01:47:06.02 +01:47:52.7 HIP 8454 39.99
2026-02-03 12:00 01:47:21.25 +01:50:04.7 HIP 8454 39.04
2026-02-04 00:00 01:47:36.64 +01:52:17.1 HIP 8454 38.56
2026-02-04 12:00 01:47:52.16 +01:54:30.1 HIP 8454 38.57
2026-02-05 00:00 01:48:07.83 +01:56:43.5 HIP 8454 39.10
2026-02-05 12:00 01:48:23.64 +01:58:57.4 HIP 8454 40.13
2026-02-06 00:00 01:48:39.59 +02:01:11.8 HIP 8454 41.63
2026-02-06 12:00 01:48:55.68 +02:03:26.6 HIP 8392 40.55
2026-02-07 00:00 01:49:11.92 +02:05:41.8 HIP 8657 39.65
2026-02-07 12:00 01:49:28.28 +02:07:57.5 HIP 8657 34.98
2026-02-08 00:00 01:49:44.79 +02:10:13.6 HIP 8657 30.28
2026-02-08 12:00 01:50:01.43 +02:12:30.1 HIP 8657 25.55
2026-02-09 00:00 01:50:18.21 +02:14:47.1 HIP 8657 20.79
2026-02-09 12:00 01:50:35.12 +02:17:04.4 HIP 8657 16.01
2026-02-10 00:00 01:50:52.17 +02:19:22.1 HIP 8657 11.21
2026-02-10 12:00 01:51:09.35 +02:21:40.2 HIP 8657 6.43
2026-02-11 00:00 01:51:26.66 +02:23:58.7 HIP 8657 2.09
2026-02-11 12:00 01:51:44.09 +02:26:17.6 HIP 8657 3.96
2026-02-12 00:00 01:52:01.66 +02:28:36.8 HIP 8657 8.72
2026-02-12 12:00 01:52:19.36 +02:30:56.3 HIP 8757 4.85
2026-02-13 00:00 01:52:37.19 +02:33:16.3 HIP 8757 3.38
2026-02-13 12:00 01:52:55.14 +02:35:36.5 HIP 8757 7.09
2026-02-14 00:00 01:53:13.21 +02:37:57.1 HIP 8757 11.87
2026-02-14 12:00 01:53:31.42 +02:40:18.0 HIP 8757 16.85
2026-02-15 00:00 01:53:49.74 +02:42:39.2 HIP 8757 21.93
2026-02-15 12:00 01:54:08.19 +02:45:00.8 HIP 8958 22.22
2026-02-16 00:00 01:54:26.76 +02:47:22.6 HIP 8958 17.06
2026-02-16 12:00 01:54:45.45 +02:49:44.7 HIP 8958 11.92
2026-02-17 00:00 01:55:04.26 +02:52:07.1 HIP 8958 6.90
2026-02-17 12:00 01:55:23.18 +02:54:29.8 HIP 8958 2.93
2026-02-18 00:00 01:55:42.23 +02:56:52.7 HIP 8972 4.04
2026-02-18 12:00 01:56:01.39 +02:59:15.9 HIP 8972 8.64
2026-02-19 00:00 01:56:20.67 +03:01:39.3 HIP 8972 13.82
2026-02-19 12:00 01:56:40.06 +03:04:03.0 HIP 8972 19.13
2026-02-20 00:00 01:56:59.56 +03:06:26.9 HIP 8972 24.50
2026-02-20 12:00 01:57:19.18 +03:08:51.0 HIP 8972 29.92
2026-02-21 00:00 01:57:38.91 +03:11:15.4 HIP 9275 30.63
2026-02-21 12:00 01:57:58.75 +03:13:39.9 HIP 9275 25.34
2026-02-22 00:00 01:58:18.69 +03:16:04.7 HIP 9275 20.14
2026-02-22 12:00 01:58:38.75 +03:18:29.6 HIP 9275 15.17
2026-02-23 00:00 01:58:58.91 +03:20:54.7 HIP 9275 10.77
2026-02-23 12:00 01:59:19.18 +03:23:20.0 HIP 9275 8.01
2026-02-24 00:00 01:59:39.55 +03:25:45.5 HIP 9275 8.69